Parting and Grooving

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USER’S GUIDE

Parting and Grooving



The parting and grooving concept

Parting and grooving is a turning category of its own with a wide range of machining applica-

tions requiring dedicated tools (which can, to some extent, be used for general turning). Tofully utilize the tools and get the best machining results there are some factors to consider.

This user’s guide helps you to choose the right tool and insert for each parting and grooving

operation and gives ideal cutting data start values. It also provides optimised programming

strategies and helps to avoid machining problems.



Simple and smart recommendations or

parting and grooving operations ............... 2

The dierent systems and when to use

them ................................................................ 4

Parting .......................................................... 19Parting of bars ........................................... 20

Parting of tubes ......................................... 23

Grooving ...................................................... 27

Single cut grooving ................................... 28

Methods of turning grooves .................... 30

Circlip grooving ....................................... 35

Face grooving ............................................ 36

Undercutting ............................................. 39Internal grooving ...................................... 40

Profling ........................................................ 42

Hard part machining ................................ 44

Machining of aluminium and non ferrous

materials .................................................... 46

HRSA and titanium grooving ................. 47

Titanium alloys ......................................... 47

Small part machining

– sliding head machines ............................ 49

Tool holding systems .................................. 56

Grades ........................................................... 71

Cutting data recommendations ............... 74

Wear mechanism – Trouble shooting ...... 76

Tailor Made .................................................. 78

Inserts ........................................................ 78

Toolholders ............................................... 79

Special products........................................... 81

Contents



2

Simple and smart recommendationsfor parting and grooving operationsMore in-depth information, including practical hints is shown under each chapter.

For cutting speed, see page 74.

CRGC2135

125 m/min0.12 mm/r

Parting

of bar

Geometry:Grade:Cutting speed:Feed:

More info: Page 20

CMGC1125

125 m/min0.12 mm/r

Parting

of tube

GMGC1125

150 m/min0.1 mm/r

Grooving

Page 27

Values for insert width 3 mm.

TMGC4025

150 m/min0.12/0.2*

Turning

Geometry:Grade:Cutting speed:Feed:

More info: Page 33

154.0GC1020

150 m/min0.08 mm/r

Circlip grooving

Page 35

ROGC1125

150 m/min0.07 mm/r

Undercutting

Page 39

*Radial feed 0.12, axial feed 0.2.

GMGC1125

125 m/min

0.07 mm/r

Internal grooving

Geometry:Grade:Cutting speed:

Feed:

More info: Page 40

TF GC4125

125 m/min

0.1/0.15*mm/r

Face

grooving

Page 36

RMGC1125

150 m/min

0.2 mm/r

Profiling

Page 42

Values for insert width 3 mm. *Radial feed 0.1, axial feed 0.15.

Page 23



3



4

CoroCut 2 CoroCut 1 CoroCut3 Q-Cut 151.2 Q-Cut 151.3

Parting (Cut-off) Page 19

Grooving Page 27

Face grooving Page 36

Turning Page 33

Profiling Page 42

Undercutting Page 39

Circlip grooving Page 35

Medium Deep Shallow

Internalsmalldia

Deep

Internalsmalldia

The different systemsand when to use them

External



5

= First choice = Second choice = Third choice

Deep parting ø ≤110 mm

Medium parting ø ≤40 mm

Shallow parting ø ≤12 mm

U-Lock 154.0



6

Internal grooving – min. hole diameter

Face grooving – min. hole diameter

≥4,2 ≥10≥12

≥25

ø 6,2 ø 12 ø 24 ø 34

0,3 10 12 25

6,2-18 mm 14-30 mm 24-50 mm 40-500 mm

First cutdiameter

Min hole

diameter



7

Groove milling – min. cutter diameter

ø39 mm

ø10 mm

Type 327 Type 328



8

CoroCut 1- and 2-edge inserts

– the first choice system

Inserts

This system is based on a patented Rail and V-shaped design which, together with a long

insert, gives exceptional stability. These factors make it possible to run at higher cutting dataand to achieve better productivity than any other system on the market.

Insert

Holder

V-shape Rail-shape

The inserts are available in different insert seat sizes covering inset widths from 1.5 mm up

to 8 mm, having different corner radii.

The insert seat sizes (D–L) must correspond with the holder seat size.

Most of the inserts are 2-edged versions in order to give good economy. Note that the

maximum cutting depth, ar, for these inserts is limited, see the table.

If larger depth is needed, use the 1-edged solution which can cut as

deep as the blade will allow.

Insert seat size Insert width,

mm

from

Max. cutting

depth, ar, for

CoroCut 2

inserts, mm

D 1.5 12.9

E 2 19

F 2.5 18.9

G 3 18.8

H 4 23.7

J 5 23.6

K 6 23.5

L 8 28.4



9

C = Cut-off i.e. PartingG = GroovingT = TurningR = Round insert i.e. ProfilingA = Aluminium machining

The first letter in the geometry name repre-

sents different application areas.

F = Finishing i.e. low feed areaM = Medium feed areaR = Roughing i.e. high feed areaO = Optimising i.e. for special areasS = Sharp edge, extremely low feed areaE = Edge rounded, for special cases

The second letter gives information about

feed area.

N123G2-0300-0002-CM

Code example:

Geometry designation

Geometries

A large variety of geometries are available, dedicated to different applications and feed areas.

Select the geometry after application and feed, see the table.

Parting

(Cut-off)

Grooving Turning Profiling

(Round)

Aluminium pro-

filing

Finishing CF GF TF

Medium CM GM TM RM AM

Roughing CR

Optimiser RO

Sharp CS RS

ER treated GE RE

CoroCut insert geometries



10

CoroCut3 – for shallow partingIntended for economical shallow parting in mass production.

The triangular shaped 3-edged inserts are available in widths 1–2 mm. The insert seat with a

stable triangular shape allows cutting depths up to 6.4 mm.

InsertsAvailable in 1, 1.5 and 2 mm widths and two insert seat styles, T for right hand and U for left

hand holders. Depth limitations as below.

Neutral inserts and front angled versions in 5° and 10° available.

Tailor made inserts available from 0.5–3.20 mm.

Geometries

Available in two geometries, CM and CS.

CM chip breaking geometry is intended for normal cutting conditions.

CS geometry with an extra sharp edge together with an open chip former should be used at

very low feeds and in low-carbon materials. CS is also intended for multi-spindle machines.

Right hand styleinsert (T)

Left hand styleinsert (U)

Insert width,

mm

Max. cutting depth, ar, for

CoroCut3 inserts, mm

1.0 4.3

1.5 6.4

2.0 6.4



11

Q-Cut 151.2 – for deep partingQ-Cut 151.2 is recommended for deep parting operations. The V-clamped 1-edged insert is

ideal for parting operations. Together with parting blades, cutting depths of up to 55 mm are

possible.

Parting geometries

FinishingLow feed

7E

MediumMedium feed

5E

RoughingHigh feed

4E

Sharp 5F

OptimisedChip control

9E

Q-cut insert parting geometries

Inserts

Choose from a programme of insert widths

from 2-8 mm.

Geometries

Dedicated geometries for parting7E, 5E, 4E, 5F and 9E..



12

Q-Cut 151.3 – for internal machining

and small diameter face groovingQ-Cut 151.3 is to be used for internal machining (diameters from 20–40 mm) and for face-

grooving of smaller diameters (first cut diameter from 24–40 mm).

The inserts are thinner in design in order to machine smaller diameters than the CoroCut 1-

and 2-edge inserts.To be used together with 151.3 bars and toolholders.

Precision

grooving

Face

grooving

Profiling

Low feed 4G 7P

Medium feed 7G

Inserts

A programme with widths from 2–8 mm.

Q-Cut inserts for internal/facegrooving use



13

CoroCut XS – for external small micro

componentsCoroCut XS is a tangentially mounted system for precision machining in sliding head

machines. CoroCut XS is available for external parting, grooving turning, backturning and

threading applications. The extremely sharp cutting edges perform well at low feeds.

Inserts

Parting and grooving insert widths from 0.5–2.5 mm.

Parting off Grooving Turning Back Turning Threading

Low feed MACR MABR MAFR MABR MATR

CoroCut XS Micromachining



14

CoroCut MB – a system for internal grooving,

threading and turningCoroCut MB has a front mounted exchangeable insert. Intended for internal machining in

hole diameter from 10–25 mm. Sharp cutting edges for good results at low feeds.

Boring bars in steel and carbide with through coolant to be used together with easy-fix

clamping for overhang up to 6 x D.

Inserts

Grooving inserts in widths from 0.7–4 mm. Profiling, face grooving and preparting insertsare also available.

Threading inserts for metric, UN and Whitworth forms.

Turning inserts for internal precision machining.

Grooving Face Grooving Profiling Preparting Turning Threading

Low feed MB-07GMB-09G

MB-09FAMB-09FB

MB-07RMB-09R

MB-07GX MB-07TMB-07TEMB-07B

MB-07TH

CoroCut MB, internal grooving



15

U-Lock 154.0 – for economical circlip groovingWe recommend the U-Lock 3-edged inserts for both external and internal circlip grooving.

Inserts

A programme with widths from 1.10–4.15 mm.



16

CoroTurn XS – a system for internal precision

machiningCoroTurn XS has an insert in the form of a carbide-rod mounted in a holder. It is intended

for precision machining in hole diameters from 3-12 mm, with extremely sharp cutting edges

for good results at low feeds.

Grooving Face Grooving Profiling Preparting Turning Threading

Low feed CXS-..G CXS-..F CXS-..R CXS-..GX CXS-..T CXS-..TH

CoroTurn XS, internal precision machining

Inserts

Grooving insert widths from 0.78–2 mm, facegrooving, profiling and preparting inserts are

also available.

Threading inserts for metric, UN and Whitworth forms.

Turning inserts for internal precision machining.



17

CoroMill 327 – grooving cutter for milling

applicationsCoroMill 327 is intended for circlip grooving, T-slots milling and all other slot milling opera-

tions. CoroMill 327 is based on a sharp 3-edged insert together with a rigid screw clamping.

The inserts produce grooves in holes of diameter ≥10 mm and width from 0.7–5.15 mm.

Weldon shanks in steel and carbide for different overhangs are available.



18

CoroMill 328 - grooving cutter for milling

applicationsCoroMill 328 is intended for circlip grooving, T-slots milling and all other slot milling opera-

tions. The CoroMill 328 has milling cutters for holes from min. 39 mm and 3-8 insert seats.

Sharp inserts are available from 1.3-5.15 mm width.



19

CF

CS

CM

CR

PartingFor parting we offer dedicated geometries with the CoroCut system. These geometries are

designed to make the chip narrower than the groove and to give excellent chip control. The

geometries are designed for high feed (CR), medium feed (CM) and low feed (CF). For

extremely low feed and lowest possible cutting forces we offer the CS-geometry.

For more information, see the Main catalogue.

For more information about cutting speed, see page 74.

The CoroCut 1- and 2-edge solutions offer excellent stability and

give good results at medium cutting depth. For small cutting depths

CoroCut3 is the first choice.

For large cutting depths CoroCut 1-edge is the first choice and

Q-Cut 151.2 is second choice.

Radial feedInsert width (Ia),3.0 m

Feed (f n

),mm/r

0.05 0.1 0.2 0.3 0.4

= Recommendedstarting value.

= First choice.



20

Machining specification

Operation: Parting off to centreMaterial: JIS SCM 415, CMC 02.1, HB 240Toolholder: LF123F10-2525BInsert: N123F2-0250-003-CRGrade: GC1125

Cutting data

Width of insert:Cutting speed:Feed (reduced at the end):Time in cut:Components:

Competitor

2.0 mm129 m/min0.05 mm/r0.11 min1200 pcs

Sandvik Coromant

2.0 mm129 m/min0.07 mm/r0.08 min2600 pcs

Parting of barsWhen parting it is recommended to use an

insert as narrow as possible in order to save

material and minimise cutting forces.

Long overhangs (ar) causing instability could

result in tool failure and poor component

quality.

The recommended overhang should not

exceed 8 x la (width of insert).

Select correct width, geometry and system for parting of bars

Tool life +116% Productivity +40% Annual time saving 175 hours

Recommended grade and cutting data

Starting grade is GC2135. Cutting speed 125 m/min.

For more information about grades, see page 71.

Ø 20.5

15

Case story

Component

dia, mm

Insert width,

Ia, mm

Insert

geometry

Tool system Feed start

value, mm/r

< 8 1 CM/CS CoroCut3 0.05

8–12 1.5 CM CoroCut 2&3 0.07

12–16 2 CM CoroCut 2 0.08

16–24 2.5 CR CoroCut 2 0.08

24–32 3 CR CoroCut 2 0.12

32–40 4 CR CoroCut 2 0.15

40–48 5 4E Q-Cut 0.1848–56 6 4E Q-Cut 0.20



21

±0.1 mm

Practical hints

For a correct cutting process, be sure that

the cutting edge height is maintained at a

tolerance of ±0.1 mm of work piece centre.

The most difficult sequence in parting to

centre is when the component “drops” off.

The cutting speed is extremely low, generat-ing built-up edge on the insert corner. When

the cut-off part of the component falls there

is a large risk of chipping of the insert cor-

ners.

To increase tool life substantially and prevent inconsistent performance:

Re• duce the feed rate by up to 75% – around 2 mm prior to the part falling off.

Stop the parting operation prior to reaching the centre point. The cut-off part will drop at•

a point prior to centre due to its weight and length. Leave the pip on the bar to be facedoff with a conventional tool.

Do not pull insert back after cutting off, pull it away then back.•

Dwelling (microsteps) helps chip breaking in long chipping materials.•

When cutting hexagon bars, a reduction of feed is necessary until you have a constant cut-•

ting.

Increase speed aas the bar gets shorter in bar feeding machines.•

A subspindle can be used to pull away the component before the insert reaches the centre.•

fn

n

D D

vc

Feed rate reduction.

0.25 x fn

~2 mm



22

Pip free parting

To avoid or minimise pips use right hand

style or left hand style ground inserts with

smallest possible front angle that gives an

acceptable component.

Inserts with 5° front angle are available in

CF, CM and CR geometries. Inserts with10° and 15° front angle are available in CS

geometry.

Note that a large front angle reduces

pips, but will not produce a straight cut and

give poorer surface finish and shorter tool

life.

For straight parting and high stability use

a screw clamp holder with the shortestoverhang, ar. A reinforced toolholder will

increase the stability even more.

Reinforced blade.

Screw clamp holderwith short a

r.

Parting – small

diameter barsWhen parting off small diameter bars, ensure

the lowest possible forces are generated.

Use inserts with smallest possible width and

sharpest edges, i.e. CS or CF geometries.

The precision ground CoroCut XS hav-

ing widths down to 0.7 mm and 15° front

angled for pip-free parting are ideal for these

types of applications.



23

Component

wall thickness,

mm

Insert width,

la, mm

Insert

geometry

Tool system Feed

start value,

mm/r

< 4 1 CM/CS CoroCut3 0.05

4–6 1.5 CM CoroCut 2&3 0.07

6–8 2 CM CoroCut 2 0.08

8–12 2.5 CM CoroCut 2 0.08

12–16 3 CM CoroCut 2 0.12

16–20 4 CM CoroCut 2 0.15

20–24 5 4E Q-Cut 0.18

24–28 6 4E Q-Cut 0.20

Parting-off tubesThe width of the insert is recommended to

be as narrow as possible in order to save

material and minimise cutting forces.

Long overhangs (ar) causing instability could

result in tool failure and poor component

quality.

Select correct width, geometry and system for parting of tubes


Starting grade is GC1125. Cutting speed 125 m/min.




24

Parting into a drilled hole.

±0.1 mm

For correct cutting process, be sure that the

cutting edge height is maintained at a toler-

ance of ±0.1 mm of work piece centre.

When parting into a drilled hole and insert•

enters the cone of the hole, the unbalanced

cut may force the blade to deflect. This

will create increased forces on one corner

of the insert which may result in insert

chipping and inconsistent tool life.

When parting into a drilled hole, always•

ensure that the drilled depth allows for the

component length and the width of the

parting insert, see picture.

To reduce burrs on the inside, use•

CoroCut XS dedicated for preparting and

chamfering inserts. Also other tools can be

used for making an internal groove.

To avoid burrs on inside.

Practical hints



25

Burr free parting

To avoid or minimise burrs use right or left hand style ground inserts with smallest possible

front angle that gives an acceptable component.

Inserts with 5° front angle are available in CF, CM and CR geometries. Inserts with 10° and

15° front angle are available in CS geometry.

Note that a large front angle reduces burrs, but will not produce a straight cut and will give

poorer surface finish and shorter tool life.

For straighter parting and the best stability use a screw clamp holder with the shortest over-

hang, ar. A reinforced toolholder will increase the stability even more.

Parting with short overhang

and reinforced holder.

2.5

Ø 10 Ø 32

15º


Operation: Parting of a tube (burr free parting)Material: CMC 01.1, HB 180Machine: CNC turning latheToolholder: LF123F20-2020BInsert: L123F20-0250-1501-CSGrade: GC1125

Cutting data

Cutting speed:Feed:Time in cut:Components:

Competitor

150 m/min0.1 mm/r0.067 min1100 pcs

Sandvik Coromant

150 m/min0.1 mm/r0.067 min2000 pcs


Case story



26

Parting – thin-walled tubesWhen parting off into thin-walled tubes ensure the lowest possible cutting forces are gener-

ated. Use inserts with smallest possible width and sharpest edges, i.e. CF or CS geometries.

The precision ground CoroCut XS in combination with widths down to 0.7 mm gives the

lowest cutting forces.



27

GroovingFor grooving applications we offer dedicated geometries with the CoroCut system, e. g. GF,

GM, TF and TM. These geometries are designed to give specific benefits in both radial and

face grooving, and other machining methods such as external and internal multiple grooving

and plunge turning.

The different geometries are suitable for high or low feed machining.

For circlip grooving, U-Lock 154.0 is the first choice for productive solutions.

TF – First choice, all-round geometry.

TM – Productive side turning.

GM – Chip control in different material.

GF – Precision grooving.

For more information about cutting speed, see page 74.


Feed (f n),

mm/r0,05 0,1 0,2 0,3 0,4


= First choice.

TF

TM

GM

GF



28

Single cut groovingSingle cut grooving is the most economical and productive method of producing grooves and

is possibe for use on insert widths up to 8 mm.

The GF geometry precision insert has a width tolerance of ±0.02 mm. GF is our low feed

choice (0.02–0.25 mm/r) and GM is intended for tougher machining e.g medium feed

(0.04-0.30 mm/r).

The TF geometry is designed with wipers on the side in order to generate extreme high sur-

face quality on the side of the groove.

The stable CoroCut system makes it ideal to chamfer corners.

Choose correct width from our wide standard programme or order an insert that directly

corresponds to the actual groove with our Tailor Made programme, see page 78.

= Wiper designgiving superiorsurface finish


Starting geometry is TF and grade is GC1125.

Cutting speed 120-190 m/min and feed 0.06-0.12 mm/r.




29

A B

4

Ø 31.85

0.5 x 45º

11.3

When producing high quality grooves there is often a need for chamfered corners. One way

to produce these is to use a standard width CoroCut GF insert and after the groove is made,

use the corners of the insert to chamfer, see illustration A.

A more productive way when machining large series is to order a Tailor Made insert with the

exact form of the groove, see illustration B. Often cutting time can be reduced by up to 50%

compared to the previous method. In this case shape option 16 is used.

Read more about Tailor Made on page 78.


Operation: GroovingMaterial: CMC 02.1, HB 240Machine: CNC turning latheToolholder: LF123H13-2020BInsert: N123H2-0400-0002-GF Grade: GC1125

Cutting data

Cutting speed:Radial/axial feed:Time in cut:Components:

Competitor

110 m/min0.07/0,04 mm/r0.06 min500 pcs

Sandvik Coromant

120 m/min0.10/0.07 mm/r0.04 min1199 pcs


Case story

Practical hints



30

Multiple grooving.

operations.

Plunge turning operation.

Methods of turning groovesThe most common applications for wide grooves or turning between shoulders are multiple

grooving, plunge turning or ramping. All three methods are roughing operations and have to

be followed by a separate finishing operation, see page 32.

A rule of thumb is that if the width of the groove is smaller than the depth – multiple groov-

ing should be used and vice versa for plunge turning. However for slender components ram-

ping may be used.

Plunge turning

Geometries TF and TM should be used for

plunge turning and ramping operations as

the inserts are made for both radial and axialfeeds.

Axial turning depth should not exceed

0.75 x width of the insert.

Multiple grooving

Geometry GM is the first choice in this

type of operation. Best tool life and swarf

is obtained by using an insert width to

produce full grooves first and then remove

the rings. This protects the corner radius

and directs the swarf into the middle of

the chip breaker. Choose ring width

0.6–0.8 x width of the insert.



31

Ramping operation.

Continue cycle until required depth is achieved.

After the roughing operation a finishing cut is required to

achieve good surface finish, see page 32.

1. Radially infeed to required depth + 0.2 mm (max 0.75 x insert width).2. Retract radially 0.2 mm.

3. Turn axially to opposite shoulder position.4. Retract radially 0.5 mm.

Roughing – recommended machining sequence

In order to generate a flat bottom and high quality on the side of the groove the following

machining sequence is recommended.

Ramping

The ramping method is recommended to

avoid vibration and minimise radial forces

when machining slender components. It also

gives best swarf control and reduces notch

wear in advanced materials.

By using a round insert, RO or RM geom-etry, the feeding can be done faster, giving an

even and higher productivity.

Ramping, however, does double the number

of cuts required.



32

Finishing of grooves

Care must be taken when machining around the bottom radius of the groove. As the insert

contours around the radius, most of the movement is in the Z direction. This produces an

extremely thin chip along the front cutting edge and can result in rubbing and hence vibra-tion.

To prevent this adopt the following machining sequence – axial and radial cutting depth

should be 0.5–1.0 mm.

Plunge turning

Direction of feed

Feed – axial – 0.3 mm/r

Direction of feedFeed – radial – 0.2 mm/r

Cycle time comparison

Insert width 6 mm

Insert width 6 mmDepth of cut 3 mm

Direction of feed

Feed 0.2 mm/r

24

16 36 46

21

9

Multiple grooving

24

16 36 46

21

9

x

z

32 sec 70 sec 56 sec

37 sec 68 sec

(7 passes)

44 sec

(3 passes)



33

BA

Axial turning – surface finishDue to the wiper effect achieved in axial turning with CoroCut it is possible to generate a

high quality surface finish. Ra value below 0.5 can be generated, and also high bearing ratio is

achieved resulting in the elimination of a grinding operation.

Comparison between CoroCut(A) and conventional turningtools (B). For comparison of surface finish achieved, seethe following graph.

Surface finish comparison

Depth of cut/feed rate

When high feeds are used in conjunction with low depth of cut (DOC), or low feeds with

high DOC, sufficient deflection of the tool will occur to give clearance for the front cutting

edge.However, where low feeds and low DOC are combined the axial forces may be insufficient

to give clearance. This may cause rubbing and hence vibration.

Solutions

1) If possible raise DOC or feed rate.

2) Use TF geometry with a concave cutting edge which will limit contact.

3) By changing to a holder with longer Ar , will affect the result.

Surface finish,Ra µm

Feed, mm/r

4.0

3.5

3.0

2.5

2.0

1.5

1.00.5

0.1 0.15 0.2 0.25 0.3

TNMG 160404

TNMG 160408

CoroCut – 5 mm RM

CoroCut – 4 mm TF

CoroCut – 6 mm TM



34


First choice geometry for turning of grooves is TF for low feed and TM for higher feeds.

Starting grade is GC1125. Cutting speed 150 m/min, radial feed 0.12 mm/r and axial feed

0.2 mm/r.

Roughing

Finishing

Ø 98

Ø 90

12.4

Roughing

Finishing

100

58

16




Operation: Plunge turningMaterial: CMC 02.1Machine: CNC turning latheToolholder: LF123H13-2525BMInsert: N123H2-0400-0004Grade: GC1125

Cutting data - Roughing

Geometry:Cutting speed:Radial/axial feed:Depth of cut:Time in cut:Components:

Cutting data - Roughing

Geometry:Cutting speed:Radial/axial feed:Depth of cut:Time in cut:

Components:Total time in cut:

Competitor

220 m/min0.15/0.2 mm/r1.9 mm0.23 min350 pcs

Competitor

350 m/min0.1 mm/r0.25 mm0.20 min

150 pcs0.43 min

Sandvik Coromant

TM250 m/min0.15/0.2 mm/r1.9 mm0.20 min400 pcs

Sandvik Coromant

TF 350 m/min0.1 mm/r0.25 mm0.20 min

250 pcs0.40 mn

Case story


Operation: GroovingMaterial: Stainless steel, CMC 05.2Machine: CNC turning lathe

Toolholder: LF123K32-2525BMInsert: N123K2-0600-0004-TF Grade: GC1125

Cutting data

Cutting speed:Radial/axial feed:Time in cut:Components:

Competitor

120 m/min0.15/0.2 mm/r0.50 min156 pcs

Sandvik Coromant

150 m/min0.2/0.3 mm/r0.298 min183 pcs

Case story



35

Circlip groovingFor circlip grooving we have several main systems to choose from. For best economy use the

three edged U-Lock 154.0 system (width 1.15–4.15 mm) for both internal and external opera-

tions. The second choice is CoroCut with GF geometry (width 1.85–5.15 mm) giving good

productivity in external operations.

For internal machining in small holes from 10 mm diameter and width 0.73–1.70 mm, the

CoroCut is the first choice. For holes from 4.2 mm diameter and width 0.78–1.57 mm, the

CoroTurn XS can be used.

U-Lock 154.0 insert and CoroCut insert in GF.

All systems have sharp edges in order to generate a good cutting process and to achieve long

tool life.

Recommended grades and cutting data

Starting grade for U-Lock 154.0 is GC1020 and for CoroCut GF grade GC1125.Cutting speed 150 m/min and feed 0.08 mm/r.

For milling of circlip grooves on non-rotation products, the CoroMill 327 is the first choice

from 10 mm diameter and widths from 0.7–5.15 mm. CoroMill 328 is the choice for produc-

tive milling from 39 mm diameter and width 1.3–5.15 mm.

CoroCut MB and CoroTurn XS for internal circlips.

CoroMill 327 and CoroMill 328 for milling of circlip in non-rotating components.



36

Face groovingFor components having an axial groove into the component it is

important to choose the correct toolholder. The toolholder must be

adapted to the bending radius of the groove and should therefore be

curved. See Face grooving shank holders on page 61.

CoroCut 1- and 2-edged grooving and turning inserts with GM, TF

and RM geometries can be used. For small first cut diametersQ-Cut 151.3 with geometry 7G and 7P can be used. Normal feed

methods should be used. SeeTurning of grooves on page 30.

The CoroCut MB and CoroTurn XS system are dedicated for a

smaller diameter range and is available with face grooving inserts in

widths from 1.0–3.0 mm.

Toolholders

Use CoroCut solid toolholders especially designed for face grooving type RF/LF (0° insert

angle) or RG/LG (90° insert angle) covering first cut from 34–400 mm diameter giving thebest stability.

For grooving depths up to 4.5 mm, a special shallow grooving toolholder is available, see

page 62.

CoroCut SL face grooving blades can also be used together with Coromant Capto and shank

tool adaptors, making it possible to build many different combinations.


Starting grade GC1125.

Cutting speed 100–125 m/min, radial feed 0.10 mm/r and axial feed 0.15 mm/r.

RF/LF holder. RG/LG holder. The CoroCut SL system.



37

1

2

3

1

2

3

Roughing

When roughing the first cut should always

be on the largest diameter and work inwards.

Cut one gives chip control but no chip

breaking and the width of cuts two and three

should be 0.5–0.8 x width of the cutting

edge. Chip breaking will now be operatingat an acceptable level and thus, after the first

insertion, the feed can be slightly increased.

When retracting, offset the insert slightly

from the inner edge of the groove.

Finishing

When finishing, machine the first cut within

the given diameter range. For more information, see page 30.

The second cut finishes the diameter, radius

and faceturns inwards.

Finally the third cut finishes the inner diam-

eter to correct dimensions.

1

2

Practical hints

1. If the support web on the tool rubs against the

workpiece diameter on the inner side of the sup-

port web:

tool is wrong size for the diameter range;•

change tool.

tool is not parallel to axis of rotation; correct.•

lower the tool below the centre line.•

2. If the support web on the tool rubs against the

workpiece diameter on the outer side of the sup-

port web:

tool is wrong size for the diameter range;•

change tool.

tool is not parallel to axis of rotation; correct.•

lift the tool above the centre line.•



38

ø25

2,8

2,0

ø17

7

Ø 70

6

Ø 90


Operation: Face groovingMaterial: Stainless steel SS 2343, CMC 05.2Machine: CNC turning latheToolholder: RF123K25-2525B-058BMInsert: N123K2-0600-0004-TF Grade: GC2135

Cutting data


Competitor

110 m/min0.08 mm/r0.18 min390 pcs/edge

Sandvik Coromant



Case story


Operation: Face groovingMaterial: Unalloyed steel, C35, CMC 01.1Machine: CNC Bar feedToolholder: MB-A16-20-09RInsert: MB-09AF200-02-14RGrade: GC1025

Cutting data


Competitor


Sandvik Coromant



Case story



39

UndercuttingOn many components there is a need for

a grinding operation to achieve very close

tolerances. In order to grind into a shoulder

a clearance is needed. For this undercutting

operation we recommend the use of round

shaped inserts. For small clearance depthsuse CoroCut 1- or 2-edge inserts with RO

or RM geometries and for larger clearance

depths Q-Cut with 4U geometry is the best

choice.



Cutting speed 150 m/min and feed 0.07 mm/r.

RX/LX holder RAX/LAX holder RS/LS151.22 holder

Toolholders

Use CoroCut toolholders type RX/LX with insert angle 7°, 45° or 70°. For internal opera-

tions RAX/LAX style bars are available.

For external machining with Q-Cut, Coromant Capto and toolholders type RS/LS151.22 are

available.



40

Internal groovingMany components have an internal groove, most of them

are close to the entrance into the hole e.g circlip grooves.

The most common method to produce internal grooves is

by radial grooving but also multiple grooving and plunge

turning can be used, see page 30.

CoroCut with dedicated geometries GF, GM, TF and TM

to be used for internal operations. For small diameter bores

down to 12 mm, the Q-Cut 151.3 with geometry 4G can be used.

The CoroCut MB is available in solid steel and solid carbide bars for better stability in

longer overhangs. The precision grooving insert is available in widths from 0.7–3 mm.

For real small diameters 4.2 mm, the CoroTurn XS system has insert widths in the range of

0.78–2 mm.

During chip evacuation there is a large risk of chip jamming resulting in tool breakage,

especially when grooving into small holes. The chips have to be removed from the groove,

change direction 90°, pass the side of the toolholder and finally removed from the hole. For

secure chip evacuation, it is necessary to have a large deviation between hole diameter and

bar diameter hence a small diameter bar is the best option. Unfortunately there is a high risk

of vibration with small diameter bars.

Stability is the key to avoid vibration and this is related to the tool overhang and how far

into the hole the groove is machined. The risk of vibration is avoided by using the largest

bar size possible, while chip chip jamming avoidance call for the opposite.

The overhang should not exceed 3 x D for solid steel and 5 x D for solid carbide boring bars.With damped boring bars it is possible to cut with overhang up to 5 x D and with a carbide

reinforced damped bar up to 7 x D.

Carbide reinforced damped bars

dmm

dmm

dmm

Damped and carbide bars

Solid steel bars

L < 7 x dmm

L ≤ 5 x dmm

L ≤ 3 x dmm

Use EasyFix clamping sleeves for accuratemachining with less vibration and precise

height.



41




3.15

Ø 40

3

To avoid vibration the set up should have the shortest possible overhang with the lightestcutting geometry possible e. g. GF or TF.

Vibration can also be avoided when machining large width grooves by making several inser-

tions with a narrower insert and then make a finishing cut, see illustration A.

A groove can also be machined with single insertion followed by plunge turning, see illustra-

tion B. This method also avoids vibration.

To get the best chip evacuation:

Start at bottom of the hole and machine back front of the hole.•

Plunge turning/ramping.•

Use right hand or left hand style inserts to direct chips when roughing.•

Practical hints


Operation: Internal circlip grooving

Material: Stainless steel 316L, CMC 05.2Machine: CNC turning latheToolholder: RAG123G09-32BInsert: N123G2-0315-0002-GF Grade: GC1125

Cutting data


Competitor


Sandvik Coromant


Case story




42

When machining components with complex shapes CoroCut offers great opportunities for

rationalization. Since one single tool can be used instead of right and left hand conventional

tools, the tool range is minimised. This results in fewer tool changes and more room in the

turret. Using profiling inserts is often a good way of removing a lot of material in a short

time. The stability of the CoroCut system offers strong possibility to use high cutting data.

The round shaped inserts have dedicated geometries e.g. RM for medium feed and tougher

conditions, precision ground RO for stainless steel materials and other sticky materials. AM

is a profiling geometry with very sharp and positive edge dedicated for non-ferrous materialse.g. aluminium. For machining hardened steel RE is available plus the RS geometry for finish-

ing of non-ferrous materials.

Profiling

RM for first choice for profiling geometry.

RD for precision grand sharp profiling geometry.

AM for grand sharp geometry for aluminium materials.

RS for diamond tipped profiling insert for non ferrous material.

RE for CBN-tipped profiling insert for hardened material. For more information about cutting speed, see the page 74.


Feed (f n),

mm/r0,1 0,2 0,3 0,4


= First choice.

RM

RO

AM



43

Wrap around is a problem that occurs with round inserts when plunging or profiling into

corners. A large area of the insert is in contact all the time, creating high cutting pressure,

so the feed needs to be reduced. HHowever, if reduced too much, vibration may occur. To

reduce this problem the insert diameter should be as small as possible compared to the radius

being generated.

A good starting point is to use 50% feed into radius plunging compared to parallel cuts, see

example.

If you must use the same insert radius, microstops (dwelling, etc) should be used to make the

chip short and to avoid vibration.



Cutting speed start value 150 m/min and feed start value 0.20 mm/r.

f n1 = parallel cuts – max. chip thickness 0.15–0.40 mm

f n2 = radius plunging – 50% max. chip thickness

Insert radius ≥ component radius

Not recommendedInsert radius < component radius

Recommended


Operation: Profiling ballMaterial: BS080M46, CMC 01.2, HB 180Machine: CNC turning latheToolholder: LF123J13-2525BMInsert: N123J2-0600-RMGrade: GC1125

Cutting data

Cutting speed:Feed:Cutting dept:Time in cut:Components:

Competitor

200 m/min0.3 mm/r0.5–2.0 mm1.07 min175 pcs/edge

Sandvik Coromant

200 m/min0.4 mm/r0.5–2.0 mm0.8 min248 pcs/edge

Case story


Practical hints



44

Hard part machining

For productivity increase without grinding

Modern manufacturing technology places increasing demands on components to be made in

one set-up, creating the need for machining hardened components.

Modern cutting tool materials such as CBN (cubic boron nitride) act as a productivity

booster when turning is used instead of grinding. For CoroCut 1-edge a small piece of CBNis brazed into a carbide body making it possible to groove and profile in hardened compo-

nents.

Both hardened as well as induction hardened components can be machined. The groove can

be made directly into the hardened material. In volume production a pre-grooving operation

before hardening can be an advantage to get good chip control.

Components with hardness from 50–65

HRC are possible to machine.

CoroCut inserts with geometries GE forgrooving and RE for profiling are avail-

able from 3-8 mm widths in CBN grades

CB7015 and CB20. CB7015 is the first

choice being suitable for both continious

and interupted cuts. The inserts are designed

to achieve good surface quality and to keep

close tolerances.


Grade CB7015. Cutting speed 130 m/min and feed 0.05 mm/r.

Cutting depth when side turning 0.1–0.8 mm.

Geometry GE. Geometry RE.



45

r e

Adjust centre height to correct position to•

get predictable tool life, see page 21.

When machining pre-made grooves adjust•

horizontal position to equalize loads on

the corners in order to get long tool life. If

you have to machine in the bottom of thegroove, reduce feed at the end of the cut.

100

8 +0.1

3

Pre-made grooved component.

≤ 0.5 r e to reducenotch wear

Practical hints


Operation: Grooving in hardened materialMaterial: 20 Mn Cr 5, CMC 04.1, 59–61 HRCMachine: CNC turning latheToolholder: LF123L25-3225BMInsert: N123L1-080008S01025Grade: CB7015

Cutting data

Insert width:Cutting speed:Radial/axial feed:Time in cut:Components:

Competitor

5 mm – 2 steps170 m/min0.04 mm/r0.28 min120 pcs/edge

Sandvik Coromant

8 mm – 1 steps150 m/min0.05 mm/r0.13 min169 pcs/edge

Case story




46

Geometry RS

Machining of aluminium and

non-ferrous materialsMany components are made in aluminium or other

non-ferrous materials such as copper, brass, bronze but

also plastic materials.

A common feature with these materials is that asharp edge and an open chip breaker is needed to be

successful. In order to achieve these sharp edges, nor-

mally the edgeline has to be ground and the carbide

needs to be either uncoated or with a thin coating.

Grade GC1005 is recommended as first choice for roughing operations and sharp edged H10

or H13A for finishing operations.

For components demanding extreme high surface finish a diamond tipped insert is recom-

mended as it gives the possibility of using high cutting data and to achieve long tool life.

Geometry AM

Geometry GF Geometry CS


Grade GC1005 for roughing, grade H10 and H13A for finishing.

Cutting speed 300 m/min and higher, feed 0.2 mm/r.

Profiling

The AM geometry in grade GC1005 and

H10 is designed for these materials and

combined with the superior stability of the

CoroCut system it is also suitable for pro-

filing of aluminium wheels. When extremesurface finish is required the CoroCut 1-edge

insert with diamond tipped RS geometry in

grade CD10 should be used.

Grooving/Parting

For grooving and parting operations GF

geometry in grade H13A is a good choice. If

there is a need for pip and burr free machin-

ing the sharp CS geometry in grade GC1125

is first choice.



47

Heat resistant super alloys (HRSA)

HRSA falls into three groups: nickel-based, iron-based and cobalt-based alloys. The physical

properties and machining behaviour of each group varies considerably. Whether the metal

is annealed or aged is particularly influential on the subsequent machining properties as the

hardness varies from 150 to 440 HB.The machinability of HRSA is generally poor compared to both general steels and stainless

steels.

In this material we recommend to use CoroCut 1- and 2-edged inserts with PVD coating like

GC1105 for medium finishing machining and MTCVD grade S05F for roughing.

For higher cutting speed ceramic inserts in grade CC670 for finishing in the 150.23 system

will improve the productivity.


First stage machining (Roughing)

Starting grade S05F. Cutting speed 60 m/min and feed 0.10 mm/r.

Intermediate stage machining (Medium)

Starting grade GC1105. Cutting speed 50 m/min and feed 0.10 mm/r.

Last stage machining (Finishing)

Starting grade GC1105. Cutting speed 50 m/min and feed 0.10 mm/r.

Starting grade CC670. Cutting speed 300 m/min and feed 0.10 mm/r.

Titanium alloysTitanium alloys are typically machined in the annealed or solution treated and aged condi-

tion, when hardness can vary between 300-440 HB. The machinability is also poor compared

to both general steels and stainless steels, which imposes particular demands on the cutting

tools.

For good results in these materials we recommend to use CoroCut 1- and 2-edge inserts with

a sharp edge e.g. in uncoated grade H13A.


Starting grade H13A. Geometries TF/GF/RO.


HRSA and titanium grooving



48

CoroTurn HP

– High pressure coolantIn order to achieve chip-breaking in tita-

nium alloys and to prolong tool life or

to have increased productivity due to

higher feeds we recommend to install highpressure coolant in your machine.

Accurate coolant jets with laminar parall-

lel flow, are easily channeled through the

Coromant Capto® coupling.

The jets produce a hydraulic wedge, lift-

ing the chip, reducing the temperature and

improving the chip control. See the illustra-

tion.

Contact your local Sandvik Coromant

salesman for more information.

Standard Coolant

70 bars HPC

Steel

SS1672CNMG 120408-PF

4225

Stainless steel

Sanmac 316LCNMG 120408-MF

2025

Titanium

Ti6Al4VCNGP 120408

H13A

HRSA

Inconel 718CNGP 120408

S05F

Aluminum

AlumecCNGP 120408

H13A



49

Small part machining – sliding head machines

The machines and the demand

put on the tooling

Small part machining and sliding head

machines focus on components smaller than

32 mm in diameter, also known as Swissmachines. In these machines the material

slides through the guide bush and is rotated

by a second spindle that also pushes the

material through the guide bush. The mate-

rial is then acting as the z-axis in the machine

and the tools stay close to the guide bush for

maximum stability.

These machines enable small diameter com-

ponents in large batches to be manufacturedin the most productive way.

Sliding head lathe.

Sliding head machines demand special fea-tures from cutting tools such as:

Precision made holders and inserts.•

The parting-off tool must be stable enough•

so that it can be used as a stop for the bar

material.

Toolholders without offset when the•

machines are designed with gang tool rack.

The turning applications in sliding headmachines are parting, grooving, turning,

back-turning and threading.

Oil is used as coolant and has different

effects on the metal cutting action compared

to standard lathe cutting fluid, such as differ-

ent chip flow, varied chip breaking and tool

life.

Sliding head machine with

gang tool rack, equipped

with QS™ -holding system.

Guide bush



50

Choosing a tool system

CoroCut

-S

U-Lock

-S

CoroTurn 107

-S

CoroTurn 111 CoroCut

MB

CoroCut

XS

CoroCut

XS

CoroCut

XS

CoroTurn

XS

Work piece

diameter range

32

16

8

2

External parting and grooving

When choosing the appropriate parting tool there are some things to keep in mind.

Depending on the material range and spindle size of the machine, tools of different styles

should be selected with care.

From 1.0–13 mm diameter

– CoroCut XS tools are the ideal choice as they have been made to a high degree of accuracy

with holders and inserts all precision ground. The component tolerances, therefore, are bet-

ter maintained and the sharper inserts produce a superior cutting action. CoroCut XS hold-

ers can also be used as a stop for the bar material.

CoroCut XS tools.




Parting off


Feed (f n),

mm/r

= Recomended start-ing value.

Parting &

grooving

Threading Turning Internal

machining



51

Holder with reinforced blade



Cutting speed 150 m/min and feed 0.08–0.1 mm/r.

From 12–32 mm diameter

– CoroCut 1- and 2-edge are the ideal

choice. Optimised holders with –S in the

code indicate that they are designed for

sliding head machines and have beneficial

features such as angled insert clamping screw

for easier clamping and blade reinforcement

for better stability. These toolholders can

also be used as a stop for the bar material.

Practical hints

The QS - holding system is a quick-change system of toolholders, stop and wedge designed•

to maximize production.

The system save valuable machining time giving easy set-up of tools to dramatically reduce

insert changing time.

Avaliable for Citizen and Star sliding head machines!



52

CoroCut® XS for external grooving applicationsThe CoroCut XS programme includes grooving inserts ranging in width from 0.5 mm, with

and without a chip forming geometry, and also dedicated parting inserts from 0.7 mm wide.

Turning, back turning and threading inserts can also be used in the same holder.

Guide-bush

Sub-spindle

If the machine has a sub-spindle a neutral style insert can be used without leaving a pip or•

burr on the finished component.

The subspindle can be used to pull away the component before the insert reaches the centre.•

However, if the machine does not have a sub-spindle it is important to choose an insert•

with a right or left hand style insert with at least 10° front angle as this will enable the pip/

burr to be removed.

Practical hints

CoroCut XS holders with -X in the code are designed for parting operations in sliding•

head machines with a sub-spindle where there is a limited tool space. This tool enables

the sub-spindle to get close to the main spindle without colliding with the toolholder, see

illustration.



53

CoroTurn® XS for internal machining(Diameter area from 4.2–12 mm)

For internal grooving CoroTurn XS is the ideal tooling family. The smallest bore possible for

grooving with CoroTurn XS is 4.2 mm and is available with different insert widths.

This tooling system has four insert sizes dedicated to different bore diameters. Also a range

of various lengths is available for specific applications. However, the shortest possible over-hang should always be the first choice.

CoroTurn XS is precision made and both holders and inserts are made to withstand the

demands of many applications. Accurate clamping of the insert ensures correct centre height

is maintained at all times.

Always correct centre height with CoroTurn XS.

CoroTurn XS – four insert sizes and various insert lengths.



54

The CoroTurn XS system includes different insert types for a wide range of applications i.e.

grooving, profiling-grooving, face-grooving, pre-parting as well as turning, back-turning and

threading.

Grooving

Grooving widths from 0.78–2 mm are available in different lengths for maximum stability, a

very important feature when grooving.

Profiling

Round insert style for internal profiling and grooving available insert widths from 1–2 mm.

Face grooving

Face grooving inserts are available for hole diameters from 6.2 mm and insert widths

from 1–3 mm. The maximum cutting depth for these inserts is 6 mm.

Grooving

Turning

Threading



55


Grade GC1025.

Cutting speed 100 m/min, feed 0.015 mm/r.

GroovingInsert width (la),mm

2.0

Feed (f n),

mm/r

0,01 0,015 0,02 0,025


Pre-parting

Special inserts are available for producing a

45° chamfer inside the bore before parting

off the component, see the illustration.

1.5

1.0



56

Parting and grooving sets high demands on accessibility since the inserts are often fed deep

into the material.

This means narrow machining and therefore the length of the tool increases as the diameterincreases. Tools and tooling systems with high stability are therefore very important.

For best productivity and economy we recommend the Coromant Capto system, offering

exceptional accuracy and stability and a full programme of clamping units, cutting units and

adaptors.

Of course we also offer a programme of conventional toolholders.

The new modular blade system, CoroCut SL, offers a large variety of blades to build your

own holder for these areas.

Tool holding systems



57

Screw clamping

Clamping of CoroCut 1 and 2-edge insertsThe insert clamping system has been designed to counteract high axial forces from both

sides. For the smaller inserts (insert seats D–G) a V-profile clamping is used, but for larger

inserts (insert seats H–L) the unique rail design adds superior stability to the insert clamping.

The rail system should be first choice for profiling and turning applications (generating side

forces) giving increased cutting data and highest stability.

Insert

Holder

V-shape Rail-shape

The force holding the insert is generated by two different designs.

1. Screw clamping.

2. Spring clamping.

Spring clamping

Spring clamping

Parting blades have deep accessibility in narrow areas due to spring clamping. This allows for

quick and easy clamping and loosening in the same operation, due to an excentric key.

See the pictures above.

Screw clamping

All our solid toolholders/bars have integrated screw clamping. This gives very stable and

secure clamping of the insert and is recommended for applications where large cutting forces

arise (together with rail insert seat). This is particularly important when combined with small

cutting depths as in longitudinal turning, profiling and face grooving.



58

Insert seats

The programme is based on eight different insert seats depending on insert widths and

geometries, see the table.

Insert seat size D E F G H J K L

Insert widths, mm 1.5 2.0-2.4 2.4-3.2 3.0-4.0 4.0-5.0 5.0-6.4 6.0-7.1 7.9-8.0

Max cutting dept

Ar max

12.9 19.0 18.9 18.8 23.7 23.6 23.5 28.4

Insert seat size to correspond with insert and toolholder.

CoroCut

Q-Cut

The Q-Cut system is based on only a V-shaped form, ideal for straight cutting forces, e.g.

parting off applications. Q-Cut have 7 different insert sizes of 20, 25, 30, 40, 50, 60 and 80.

The toolholder have a screw and spring clamping design.



59

Parting bladesIntended for parting-off and deep grooving applications. For mounting in the machine a

separate tool block must be used having normal shank sizes or Coromant Capto mounting.

Practical hints

In order to avoid vibration and to achieve best tool life adjust the overhang,• ar, of the blade

to obtain the shortest possible overhang to suit the application. See drawing below. Max ar

is 55 mm.

Choose a 2-edged insert having an a• r larger than the cutting depth, if not possible choose a

1-edged insert, see Main catalogue information.

Maxar



60

Short version. Long version. Holder for small

part machining.

To minimise risk of vibration and deflection always choose:

Toolholder with smallest possible overhang.•

Toolholder with maximum shank dimension.•

Blade or holder with maximum blade width (largest possible insert seat size).•

Solid toolholdersIntended for grooving, turning and profiling applications in Coromant Capto and shank

holder versions. Available in right hand, left hand and neutral style in short and longversions (ar).

This programme also includes a separate small part machining programme in smaller shank

sizes with an angled insert clamping screw for easier changing of insert. These toolholders

without offset are dedicated for sliding head machines.

Practical hints

If using screw clamped reinforced blades•

check the cutting depth limitations in separate

diagrams in Main catalogue.

Use the separate coolant adaptor for the tool•

block in order to achieve the best coolant

supply.

Reinforced blade.

Practical hints



61

Face grooving shank

holdersIntended for face grooving applications.

Available in 0° and 90°, right and left hand

style versions covering a large area of first

cut diameters.Covers first cut diameter from 34–400 mm.

All made in B-curved version, A-curved ver-

sion to be ordered as Tailor Made or use the

modular CoroCut SL system where both A-

and B-curved blades are available.

Q-Cut toolholder type 151.37 offers a pro-

gram of 0° and 90° covering first cut from

24–200 mm. Also internal face grooving bars

with first cut down to 18 mm are available.

min.

max.

First cut diameters.

0° face grooving

shank holder.

L

L

AR

B

L

A

RB

B

AR

B

R

L

A

0°

0°

90°

90°

The first cut must be made within the min. and max. limits for the holder, see the Main•

catalogue or separate marking on the holder.

Always start from the outer diameter and move towards the centre.•

Choose the correct tool (A or B sweep, right or left hand style) depending on your•

machine set-up and workpiece rotation. See the following illustration.

Practical hints



62

Angled shank holdersIntended for profiling and shallow undercut-

ting applications. Available in 7°, 45° and 70°,

right and left hand style versions. Developed

specifically for aluminium rim machining.

70° angled holder.

Shallow groovingholder.

Holder seat size Inser t seat size Max depth of cut ar

, mm

G E, F, G 3.5

K H, J, K 4.5

Shank holders for

shallow groovingThese holders are universal for all shallow

grooving and face grooving applications.

They are often the only solution when Tailor

Made inserts with complicated shapes are

used. One seat size can take inserts which

normally have other seat sizes up to a limited

cutting depth (ar).

Available in 0° and 90°, right and left hand

style holders.



63

Profiling bar. Grooving bar.

Internal barsIntended for internal grooving applications.

Available in right and left hand style bars

from 16 to 50 mm diameter. These bars are

equipped for internal coolant.

Also 20° angled bars for internal profiling

are available.

Bars up to 25 mm diameter are cylindrical

and designed to be used in EasyFix sleeves.

Bars above 25 mm diameter have flats.

Always mount the bars with shortest possible overhang in order to avoid vibration and•

deflection.

Apply large amounts coolant in order to both cool down the insert and also help chip•

evacuation and avoid breakage.

Use EasyFix sleeves to achieve the best set-up, avoiding vibration and giving correct centre•

height and cutting angles.

Practical hints

CoroCut3 holdersIntended for economical shallow parting and

grooving in mass production. Available inright and left hand styles, Coromant Capto

(C3/C4) and shank holder versions from

sizes 1010 to 3232.

CoroCut3 holder.



64

Coolant solutions.

The CoroCut SL systemA universal modular system. Intended mainly for internal grooving and external face groov-

ing applications. Focused on Coromant Capto set-ups.

Consists of straight and face grooving blades for external and internal use. Blades for•

CoroCut, Q-Cut 151.3 and 151.2 available.

- CoroCut for face grooving and grooving applications- CoroCut 3 for economical grooving

- Q-Cut 151.3 for small internal diameters

- Q-Cut 151.2 for deep grooving

- CoroCut XS for precision grooving

Adaptors in 0° , 90° and 45° styles in Coromant Capto and shank holder versions.•

Always mount the bars with shortest possible overhang in order to avoid vibration and•

deflection.

Possibility to mount blades on 570 adaptors, both solid steel and damped bars, in order to•

avoid vibration.

Blades with a coolant connector allow cutting fluid to be concentrated at the back of the•

insert, see drawing below.

Adaptors making it easy to fit coolant tubes both over and under the blades, see drawing•

below.



65

Left hand tool = left hand adaptor+righthand cutting blade

Right hand tool = right hand adaptor+lefthand cutting blade

Left hand Right hand

Right hand Left hand

A curveA curve

B curve B curve

Neutral

90° 90°

90° 0° 45° 0° 0° 45° 0° 90°

Left hand Right handNeutral

Other CoroTurn®SL - cutting heads

Left hand

CoroCut®SL blades CoroCut®SL blades

Right hand

Left hand tool =left hand adaptor+left

hand cutting blade

Right hand tool =right hand adaptor+righthand cutting blade



66

90° mounting•

It is very important that the insert is mounted at 90° to the centre line of the workpiece

in order to obtain perpendicular surfaces without scratch marks and to reduce the risk of

vibration.

Cutting luid•

A large supply of cutting fluid, directed exactly on the cutting edge or under the edge,

should be used while the insert is engaged and throughout the operation.

Inserts mounted at 90° to the

centre line of work piece.

±0.1 mmCorrect centre height settings•

It is essential when parting bars and

grooving relatively small diameters, that

the centre height setting is maintained to

a tolerance of ±0.1 mm. This has a major

influence on tool life, cutting forces andpip size.

Practical hints



67

CoroCut MB for internal machining(Diameter area from 10 mm)

CoroCut MB is a high precision grooving,

turning and threading system for for machin-

ing min. 10 mm diameter holes. The edge

line of the insert is sharp and together with a

thin-layered coating it is suitable for internalmachining.

The insert is mounted with a screw from the front position in three grooves for safe and sta-

ble mounting.

The system has two insert sizes dedicated to different bore diameter. Boring bars are designed

with a oval cross section for maximal stability and are available in steel and carbide bars.

Application Size 07 Size 09

Min hole 10 mm Min hole 14 mm

Grooving

Turning

–

Threading–

Face grooving–

The steel bars for overhang up to 3 x D and

the carbide up to 5.5 x D.

For accurate machining with less vibration

and precise centre height of the insert, use a

cylindrical bar with Easy-Fix sleeves.

The CoroCut MB system includes different types of inserts for a wide range of applicationsi.e. grooving, face grooving, profiling, preparting as well as turning and threading.



68

Grooving

Grooving width from 0.7–3.0 for general grooving and circlip grooving.

Profiling

Round insert styles for internal profiling and grooving available in widths from 0.8–3.0 mm.

Face grooving

Face grooving is available for hole diameters from 12 mm and width from 1–3 mm. The max-

imum cutting depth for these inserts is 5 mm.

Preparting

Inserts for producing a 45° chamfer inside the bore before parting off the component are

available.


Grade GC1025. Cutting speed VC = 100 m/min and feed 0.025 mm/r.


GroovingInsert width (la),mm

Feed (f n),

mm/r0.01

0.7- 1.0

0.0015 0.020 0.025 0.030

1.2- 1.5

1.7- 2.0

2.5

3.0



69

The insert is front mounted and posi-

tioned in three grooves for safe and stable

mounting.

The tool has four insert sizes for different

hole diameters.

The milling cutters are available in steel and

carbide Weldon shanks in two diameters

12 mm and 16 mm and for overhangs from

15 mm up to 85 mm. All milling cutters are

equipped with through coolant for improved

chip evacuation.


applicationsCoroMill 327 is a sharp precision ground milling tool for grooving and threading machining

into min 10 mm diameter holes. CoroMill 327 should be used for holes with circular interpo-

lation but also for longitudinal milling.

The insert program covers inserts for general grooving and circlip widths from 0.7–5.15 mm.

Concept Insertsize

Min. holesize/outercutter diam.

Max,depthof cut

Component groove width

2.50 2.65 3.00 3.15 4.00 5.15

327 06091214

10182228

1.53.54.56.5

****

*

****

****

*

***

* *

328 1339, 44, 63, 80

5.0 * * * * *

Concept Inser tsize

Min. holesize/outercutter diam.

Max,depthof cut

Component groove width

0.70 0.80 0.90 1.00 1.10 1.30 1.50 1.60 1.85

327 0609

1214

1018

2228

1.53.5

4.56.5

* * * * **

**

**

**

**

* *

328 13 39, 44, 63, 80 5.0 * * *



70

CoroMill 328 is used for internal and exter-

nal circlip grooves and with diameters over

39 mm. CoroMill 328 has one insert size for

circlip widths from 1.3–5.15 mm.

CoroMill 328 comes with Weldon, arbor

or bore with keyway mounting in 4 diam-

eters from 39–80 mm and 3–8 inserts with 3

indexable cutting edges for high productive

economic machining. Sharp cutting edges

generate high quality grooves with depth up

to 5.0 mm.



Cutting speed 250m/min and feed per tooth f z 0.04 mm.

For more cutting data, see the Main catalogue.


applications

Be aware, the CoroMill 327 inserts do not fit MB tools and vice versa.•

For new toolholders, preload the tip-seat by mounting and or remounting the insert a few•

times prior to cutting.



Cutting speed 250m/min and feed per tooth f z 0.04 mm.

For more cutting data, see the Main catalogue.

Practical hints



71

GradesTo cover all types of workpiece materials the CoroCut family has a variety of different car-

bide grades - from the highly wear resistant GC3115 to the toughest grade on the market

GC2145. Cubic boron nitride (CB7015) and diamond (CD10) tipped inserts are also avail-

able.

These grades have been developed to cope with the most complex of parting and groovingapplications.

It is important to detect if the grade is too wear resistant (hard) or too tough (soft), by

inspecting the edge line behaviour.

Edge line having early plastic deformation (PD), see the illustration, indicates the grade is too

tough and a more wear resistant grade should be used.

Edge line having early chipping (small carbide pieces broken out of edge line), see the illustra-

tion, indicates the grade is too wear resistant and a tougher grade should be used.

See also the different wear mechanisms on page 76.

Plastic deformation. Chipping.

T o u g h n e s s

W e a r r e s i s t a n c e

U n s t a b l e

S t a b l e c o n d i t i o n s

Practical hints



72

The different grades

Grade GC3115

Based on a hard substrate, MT-CVD coated with TiCN-Al2O3 layer.

A high wear resistant grade for grooving and turning applications under stable conditions.

Also effective in hard steels.

High cutting speeds.

Grade GC4225 – first choice for cast iron

Based on a hard gradient sintered substrate, MT-CVD coated with TiCN-Al2O3-TiN layer

(black and yellow).

An all-round grade for ISO-P and ISO-K with excellent combination of high wear resistance

and good edge security. To be used in grooving, turning and parting-off operations under

stable conditions.

Medium to high cutting speeds.

Grade GC1125 – the universal grade

A fine grained substrate, PVD-coated with TiAlN layer.

An excellent all-round grade in all ISO-areas. First choice for parting-off tubes, grooving and

turning operations and works well in low-carbon and other smearing materials.

Low to medium cutting speeds.

Grade GC2135 – first choice for stainless steel

A MT-CVD-coated grade with TiCN-Al2O3-TiN layer.

A grade for toughness demanding operations such as parting-off to centre and interrupted

cuts.


Grade GC2145

The markets toughest substrate, PVD coated with TiAlN layer.

For extremely toughness demanding operations, such as interrupted cuts and parting-off to

centre in stainless steel.

Low cutting speeds.

Grade S05F

MT-CVD-coated TiCN-Al2O3-TiN layer at a fine grained carbide substrate. For roughing

to finishing in HRSA-materials.



73

Grade GC1005

A fine grained carbide substrate, PVD coated with TiAlN layer.

Most suitable for roughing of aluminium.

Grade H10

Uncoated carbide grade.

Good edge sharpness for use in aluminium alloys and Heat Resistant Super Alloys (HRSA).

Grade H13A – first choice for non-ferrous materials

Uncoated carbide grade.

Good wear resistance and toughness combined with edge sharpness.

To be used in non-ferrous and titanium materials.

Grade GC1105 – first choice for HRSA

A fine grained carbide substrate, PVD coated with TiN-TiAlN layer.

A wear resistant grade combined with sharp edges. To be used for finishing with close toler-

ances in HRSA and stainless steel.

Grade CD10 – first choice for finishing aluminium

A polycrystalline diamond (PCD) grade.

An extremely wear resistant grade giving very good surface finish. To be used only for non-

ferrous materials.

Grade CB7015 - first choice for hardened materials

High performance cubic boron nitride composite for hardened ferrous materials.

Suitable for both continious and interupted cuts.

Grade CB20

A cubic boron nitride (CBN) grade.

A wear resistant grade. To be used for machining of hardened materials, with limited feed

and depth of cut. Eliminates grinding operations.

Other grade information

Grade 1025

A fine grained substrate, PVD coated with TiAlN layer.

An excellent all round grade for all ISO-areas. The thin coating makes it suitable for sharp

edges.




74

The recommendations are valid for use with cutting fluid.•

Note! For internal grooving, face grooving and undercutting the•

speed should be reduced by 30–40%.

ISO CMC Material Brinell GC3115 GC4225 GC1125

Feed f n’ mm/r

0,05-0,5 0,05-0,5 0,05-0,5

Cutting speed v c’

m/min

P 01.2

02.2

Unalloyed

Low-alloy ≤5%

150275

330-140270-105

315-140265-100

265-115205-95

M05.11

05.21

15.51

Ferritic/ martensitic

Austenitic

Austenitic-ferritic

(Duplex)

200180230

190-85215-100155-75

K 08.1 Grey 180 290-140 275-130 210-110

ISO CMC Material Brinell CD10 GC1005 GC1125

Feed f n’ mm/r

0,05-0,5 0,05-0,8 0,05-0,8

N 30.11

33.2

Aluminium alloys

Copper and copper alloys

6090

2650-265750-75

2400-240630-65

1900-190500-50

ISO CMC Material Brinell S05F GC1105 GC1125

Feed f n’ mm/r

0,05-0,3 0,05-0,3 0,05-0,3

S20.11

20.21

20.31

23.21

Iron base

Nickel base

Cobalt base

Titanium alloys1)

200250200950 Rm2)

200-135100-60100-65

180-12090-5590-60

80-4550-3255-3880-45

ISO CMC Material Brinell CB7015 CB20

Feed fn’ mm/r

0,05-0,1 0,05-0,1

H04.1

10.1

Extra hard steel

Chilled

60 HRC

400

145-135 125-120

200-195

Cutting data recommendations



75

1) Positive cutting geometry and coolant should be used2) Rm = ultimate tensile strength measured in MPa.

For more cutting data information pleasecheck in the Main catalogue.

ISO P = Steel, ISO M = Stainless steel, ISO K = Castiron, ISO N = Aluminium and non-ferrous materials, ISOS = Heat resistant super alloys and titanium, ISO H =Hardened materialsCMC = Coromant material classification

GC2135 GC2145 GC1105

0,05-0,5 0,05-0,5 0,05-0,5

180-75155-70

160-65140-60

145-65165-70115-55

130-50140-55105-45

400-175435-190

H10 H13A

0,05-0,8 0,05-0,8

2250-225630-65

1900-190500-50

GC2135 GC2145 H13A

0,05-0,3 0,05-0,3 0,05-0,3

50-2940-2645-28

40-3025-2030-20

50-3730-2335-2770-60



76

Wear mechanism – Trouble shootingCareful observations

To achieve best possible economy regarding tool life, workpiece quality and optimised cut-

ting data careful observations of the insert edge have to be made.

At low speed built-up edge (BUE) and chipping are the main problems, at high speeds plastic

deformation (PD), flank wear and crater wear are the problems.

Cause

Cutting edge temperature too•

low.

Unsuitable geometry or grade.•

Solution

Increase cutting speed and/•

or feed.

Choose a geometry with a•

sharper edge. Preferably a

PVD coated grade.

When parting to centre and in stainless material it is almost impos-

sible to avoid BUE. It is important to minimise this phenomenon byusing the solutions above.

Cause

Too hard grade.•

Too weak geometry.•

Unstable conditions.•

Too high cutting data.•

Solution

Choose a softer grade.•

Choose a geometry for higher•

feed area.

Reduce overhang. Check cen-•

tre height.

Reduce cutting data.•

Chipping/breakage

Built-up edge (BUE)



77

Cause

Excessive temperature in cut-•

ting zone.

Unsuitable grade.•

Lack of coolant supply.•

Solution

Reduce cutting speed and/or•

feed.

Choose more wear resistant•

grade.

Improve coolant supply.•

Plastic deformation (PD)

Cause

Cutting speed too high.•

Too soft grade.•

Lack of coolant supply.•

Solution

Decrease cutting speed.•


grade.


Flank wear

Cause

Cutting speed too high.•

Too soft grade.•

Feed too high.•

Lack of coo• lant supply.

Solution

Decrease cutting speed.•


grade.

Decrease feed.•


Crater wear

Cause

Oxidation at the cutting depth.•

Too high edge temperature.•

Solution

Use varying cutting depths.•

Reduce cutting speed.•

Notch wear



78

1 2 3 4 5

6 7 8 9 10

11 12 16 17

Grooves are often designed in many different shapes and dimensions depending on the

working area. With Tailor Made tools you can increase the productivity and make it possible

to generate grooves not possible with standard tools.

We tailor inserts and toolholders to suit your specific component requirements.

Contact your Sandvik Coromant representative for a quick quotation and competitive price

and delivery.

InsertsFor inserts choose suitable shape option (see below) plus actual dimensions according to

Main catalogue.

Tailor Made

Insert shape options



79

ToolholdersBoth conventional toolholders and

Coromant Capto are available in different

styles and for different applications.

When grooving within mass production and when the groove•

needs to be chamfered, the option 16 will reduce the cycle time by

up to 50%, if Tailor Made inserts are used.

Tailor Made toolholders with optimized a• r (min length) for the

component, will make it possible to use higher cutting data and

longer tool life. All together this will give a better productivity.

Reinforced blades optimised after bar size diameter, will achieve•

higher cutting data and longer tool life within parting off. This will

give a higher productivity.

CoroCut and T-MAX Q-Cut

for parting and grooving

Shankholders

CoromantCapto

Tooldesign

Holderstyle

Clampingsystem

Machine limi-tations

Reinforced bladeparting

Reinforced bladeface grooving Blade type Copy angle

R

N

L

F

G

Practical hints



80

CoroCut insert blanksStraight blanks for “Do it yourself grinding” are available in 9 widths from 2.3–11.6 mm.

These blanks have a flat top which allows grinding to many different shapes.

90º blanks in R/L versions are also available, mainly for use in the aerospace industry.

When grinding, a standard toolholder is suitable as a grinding fixture, and recommended set-

ting angles for the grinding wheel are shown in the drawings below.

Grinding wheel properties

Grain size: US Mesh 170-240 (75–55 mm).

Binder: Metal

Concentration: 75–100

Solutions for different products and applications can be made, see the following example.

Straight insert blank. 90° angled insert blank.



81

Special productsFor even more complicated products our special tool design facility are able to produce

inserts and toolholders to suit very specific requirements.

Contact your Sandvik Coromant sales person for more details.



Documents

Parting and Grooving