2012

Cutting tools from Sandvik Coromant

Turning toolsGENERAL TURNING | PARTING & GROOVING | THREADING | TOOLING SYSTEMS

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Infeed recommendations THREADING

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THREADING Infeed recommendations

ISO Metric (MM), external

ISO Metric (MM), internal

Dimensions x and z

mm inch

Pitch, mm

No. of infeeds

Total infeed

x

z

Radial infeed per pass

Total infeed = ap + 0.05 mm (.002 inch)

Pitch, mm

No. of infeeds Radial infeed per pass

Total infeed

x

z

C 72

THREADING Infeed recommendations

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THREADING Infeed recommendations

ISO inch (UN), external

ISO inch (UN), internal

Dimensions x and z

mm inch

Pitch, TPI

No. of infeeds

Total infeed

x

z

Radial infeed per pass

Total infeed = ap + 0.05 mm (.002 inch)

Pitch, TPI

No. of infeeds Radial infeed per pass

Total infeed

x

z

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C 73

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Infeed recommendations THREADING

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THREADING Infeed recommendations

Whitworth (WH), external and internal

BSPT (PT), external and internal

Dimensions x and z

mm inch

Pitch, TPI

No. of infeeds

Total infeed

External x

z

Internal x

z

Radial infeed per pass

Total infeed = ap + 0.05 mm (.002 inch)

Pitch, TPI

No. of infeeds Radial infeed per pass

Total infeed

External x

z

Internal x

z

C 74

THREADING Infeed recommendations

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THREADING Infeed recommendations

Round 30° Din405 (RN) external

Round 30° Din405 (RN) internal NPT (NT), external and internal

Dimensions x and z

mm inch

Pitch, TPI

No. of infeeds

Total infeed

x

z

Radial infeed per pass

Total infeed = ap + 0.05 mm (.002 inch)

Pitch, TPI

No. of infeeds Radial infeed per pass

Total infeed

Pitch, TPI

No. of infeeds

External x

z

Internal x

z

Radial infeed per pass

Total infeed

x

z

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C 75

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Infeed recommendations THREADING

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THREADING Infeed recommendations

ACME (AC), external

ACME (AC), internal

Dimensions x and z

mm inch

Pitch, TPI

No. of infeeds

Total infeed

x

z

Radial infeed per pass

Total infeed = ap + 0.05 mm (.002 inch)

Pitch, TPI

No. of infeeds Radial infeed per pass

x

z

Total infeed

C 76

THREADING Infeed recommendations

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THREADING Infeed recommendations

Stub-ACME (SA), external and internal

Dimensions x and z

mm inch

Pitch, TPI

No. of infeeds

Total infeed

External x

z

Internal x

z

Radial infeed per pass

Total infeed = ap + 0.05 mm (.002 inch)

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Infeed recommendations THREADING

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THREADING Infeed recommendations

Trapezoidal (TR), external and internal

Dimensions x and z

mm inch

Pitch, mm

No. of infeeds

Total infeed

External x

z

Internal x

z

Radial infeed per pass

Total infeed = ap + 0.05 mm (.002 inch)

C 78

THREADING Infeed recommendations

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THREADING Infeed recommendations

UNJ, external

NPTF (NT), external and internal MJ, external

Dimensions x and z

mm inch

Pitch, TPI

No. of infeeds

Total infeed

x

z

Radial infeed per pass

Total infeed = ap + 0.05 mm (.002 inch)

Pitch, TPI

No. of infeeds Radial infeed per pass

Total infeed

Pitch, mm

No. of infeeds

External x

z

Internal x

zRadial infeed per pass

Total infeed

x

z

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C 79

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Infeed recommendations THREADING

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THREADING Infeed recommendations

API thread forms

Dimensions x and z

mm inch

No. of infeeds

InsertPitch, TPI x z

Total infeedRadial infeed per pass

Total infeed = ap + 0.05 mm (.002 inch)

API 60° V-0.038R

API 60° V-0.040

API 60° V-0.050

API Round 60°

API Buttress

C 80

THREADING Infeed recommendations

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THREADING Infeed recommendations

Multi-point

Dimensions x and z

mm inch

ISO Metric (MM) ISO inch (UN), external Whitworth (WH) NPT (NT)

Pitch, mm Pitch, TPI Pitch, TPIPitch, TPI

x

z

External

No. of infeeds Radial infeed per pass

Total infeed

Internal

Pitch, mm Pitch, TPI Pitch, TPIPitch, TPI

x

z

No. of infeeds Radial infeed per pass

Total infeed

Total infeed = ap + 0.05 mm (.002 inch)

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Infeed recommendations THREADING

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THREADING Infeed recommendations

Infeed recommendations

The type of infeed, number of passes and size of infeed can have a

decisive impact on the threading operation. The infeed recommendations

are intended as starting values. Suitable number of passes must be

determined by trial and error. The harder the workpiece the more number

of passes.

- The workpiece diameter should not be more than 0.14 mm (.006 inch)

larger than the max diameter of the thread to achieve optimum tool

life.

- Infeeds of less than 0.05 mm (.002 inch) should be avoided, for

austenitic stainless steels not less than 0.08 mm (.003 inch).

- When using a Cubic Boron Nitride (CBN) grade the max infeed value

should be 0.07 mm (.003 inch).

- For C-geometry inserts, spring pass (a pass without infeed) should not

be used.

- For Multi-point inserts it is essential that the recommendations on

page C80 are used.

- For V-profile inserts the recommended number of passes that is used

for full form inserts can be used.

Cutting speed Starting cutting speed recommendations are given on page C82. Careful

observation on the cutting edge can help you to achieve the best possible

threading results.

- A cutting speed that is too low can result in built-up edge

- A cutting speed that is too high can result in plastic deformation of the

edge

FormulaFormula to calculate infeed for each pass in a reduced series.

∆ap Radial infeed

x Actual pass (in a series from 1 to nap)

ap Total depth of thread. See page C71

nap Number of infeeds. See page C71

φ 1st pass = 0.3

2nd pass = 1

3rd and higher passes = x–1

Radial infeed Modified flank infeed Incremental infeed Modified flank infeed 1°

F-geometry

A-geometry

C-geometry

vc m/min

ft/min

For technical information see our Metal Cutting Technical guide