CPT

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Mill-Thread Technical Section

CPT Mill-Thread catalog and CNC programming Software This software is provided by CPT to assist you, the thread milling user, to select and apply the correct tool to machine threads on CNC machining centers. The program will find tools and inserts which are suitable for your application, calculate cutting data and generate a CNC program for a variety of controls. The software is available at our website: www.cpt-gewindewerkzeuge.de/home

Example of Thread Milling CNC Program for Internal Threading

Right hand thread (climb milling) from bottom up. Program is based on tool center. This method of programming needs no tool radius compensation value other than an offset for wear.

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General Program G90 G00 G54 G40 G17 G94X0 Y0 S---M03 G43 H1 Z50.000 M08 G90 G01 Z- (TO THREAD DEPTH) F5000 G91 G41 D1 X(A/2) Y-(A/2) Z0 F--- G03 X(A/2) Y(A/2) Z(1/8 PITCH) I0 J(A/2) F--- G03 X0 Y0 Z(PITCH) I-(A) J0 G03 X-(A/2) Y(A/2) Z(1/8 PITCH) I-(A/2) J0 G01 G40 X-(A/2) Y-(A/2) Z0 F5000 G90 G00 Z50.000 Internal Thread EXAMPLE : M 32 X 2.0 (Thread depth 18 mm) TOOLHOLDER : SR0021 H20 (Cutting dia. 21 mm) INSERT: 21 I 2.0 ISO A = (32-21)/2 = 5.5 G90 G00 G54 G40 G17 G94 X0.000 Y0.000 S2986 M03 G43 H1 Z50.000 M08 G90 G01 Z-18.250 F5000 G91 G41 D1 X2.750 Y-2.750 Z0.000 F215 G03 X2.750 Y2.750 Z0.250 I0.000 J2.750 F74 G03 X0.000 Y0.000 Z2.000 I-5.500 J0.000 G03 X-2.750 Y2.750 Z0.250 I-2.750 J0.000 G01 G40 X-2.750 Y-2.750 Z0.000 F5000 G90 G00 Z50.000

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