CAT-SET

THREADING

Thread Mill Programming Guide

What you need to know • Thread milling can be easily accomplished with simple G code programming. • If your machine is capable of 3 axis (helical) interpolaƟon, you can and should be thread milling. • Basic programming of a one pass thread mill can be achieved in six basic steps.

AVAILABLE ONLINE 24/7 visit www.alliedmachine.com or download INSTA-CODE ®

Examples for how to calculate and program a M16x2 right-hand thread that will be 10 mm deep produced in one pass: Major thread diameter 16 mm Major diameter of thread Threads per inch (only applies to imperial threads) Length of thread 10 mm Desired length of cut Velocity 221 m/min Recommended velocity for material to be cut Feed per flute 0.038 mm/tooth Recommended feed rate per cuƫng edge Number of flutes 4 Number of flutes on tool to be used CuƩer diameter 11.94 mm Diameter of cuƫng tool Using the informaƟon above, the values can be calculated: Pitch 2.0 mm Use 1/ threads per inch for imperial Speed 5895 RPM (318.47 • m/min) / cuƩer diameter or (SFM • 3.82) / cuƩer diameter Linear feed 896.04 mm/min RPM • (Feed per flute • Number of flutes) Feed rate for thread milling 227.37 mm/min

((Major thread diameter - cuƩer diameter) / Major thread diameter) • Linear feed

0.25 mm 10.25 mm 1.015 mm 2.030 mm

Z-axis travel on arc on Z-axis travel for full thread

(Pitch / 8)

(Pitch / 8) + Length of cut

Arc on/off

(Major thread diameter - cuƩer diameter) / 4 (Major thread diameter - cuƩer diameter) / 2

Full rotaƟon value

Major thread diameter 16 mm

Feed rate for thread milling 227.37 mm/min

Arc on/off value Full rotaƟon value

1.015 mm 2.030 mm 2.00 mm

CuƩer diameter Length of thread

Z-axis depth for full thread

11.94 mm 10.00 mm

10.25 mm 0.25 mm

Z-axis for arc on/off

Pitch value

Begin and end posiƟon of CCW full rotaƟon Z to move up one pitch

N60: CCW arc to arc off posiƟon moving Z up 1/8 pitch

N40: CCW arc to full rotaƟon posiƟon moving Z up 1/8 pitch

N40 - N50

N60

N30

+ Y -

N10 - N20

N70: Move to X and Y center

N30: Move to arc on posiƟon

N80: Rapid up in Z

- X +

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