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Cre
ate
Out
stan
ding
Thr
ead
Surf
ace
with
the
inno
vativ
e PR
ML
Thre
ad M
ills!
The
Pre
miu
m
Thre
ad M
illsThe Premium Thread Mills
YAMAWA EUROPE S.p.A. - Via Don F. Tosatto 8 - 30174 Mestre - Venezia, Italy - t. +39 041 952.543 - f. +39 041 962.838 - [email protected] - www.yamawa.eu
WarningTools may shatter. Wear cover or eye glass to avoid injury during tapping.Tools may be shatter. Use tools under the proper tapping condition.Never wear gloves during turning operations as the gloves may get caught with the tools.Wear safety shoes to avoid injuring yourself by the falling tools.On attaching tools to the machine, fasten firmly to avoid chattering and run-out.Fasten the workpieces firmly so that they never move during operation. Never use worn tools or damaged tools with chipping.Take a special care to fire trouble. High temperature during machining may cause fire.
Please note that specification may change without advance notice.
HF: Ultra micro grain cemented carbide
3 Screw Threads For internal screwthreads
The Premium Thread MillsDimensions and sizes
Left Hand Cutunit: mm
Size Product code
Ds
Dc
DsDc L
L
No. offlutes
Oil holesize MSRP(JPY)The Smallest Internal
Screw Thread (Dmin.)The LargestProcessing
Depth
How to use PRMLCan be applied to various workpiece materialsRecommended Process Conditions
*RPM and Feed Rate;
Degradation of Pitch Diameter
The PRML is a left hand cutting tool. The tool rotates counter clockwise.The PRML feeds in the Z axis from the top as shown below.
Z axis
Z axis
Workpiece material
Thermal Refined Steel 35 to 45HRC
Thermal Refined Steel 25 to 35HRC
Cast Iron FC
Ductile Cast Iron FCD
Alloy Steel SCM
High Carbon Steel S45C, etc.
Medium Carbon Steel S25C-S45C
Low Carbon Steel S20C/SS400, etc.
Feed per tooth fz(mm/t)
40 to 100
40 to 100
40 to 100
40 to 100
40 to 100
40 to 100
60 to 100
60 to 100
0.02 to 0.05
0.03 to 0.06
0.02 to 0.05
0.02 to 0.05
0.04 to 0.06
0.04 to 0.06
0.03 to 0.05
0.03 to 0.05
RPM (min-1)=1000 mm x Cutting Speed/3.14/Outside Diameter (Dc) of PRML cutter.Feed Rate (mm/min)=fz (mm/t) x No. of flutes x RPM x (Major diameter of internal screw thread - Dc)/Major diameter of internal screw thread)
Process Data
Workpiece material
Cutting Speed
Feed per tooth fz
Cutting Depth
Hole diameter
Number of insection
Machine
Cutting Fluid
SCM440 (30HRC)
100 m/min
0.06 mm/t
24 mm
10.3
1
Machining Center (BT30)
Water Soluble (Emulsion x 20)
Process Conditions: PRML 9.0P1.75 M12x1.75
* No Program Correction
ConventionalProduct
Long Tool Life
Internal coolant External coolant
Chips
Internal Surface
Internal coolant is recommendedfor blind hole thread milling
2 099999 830864