Page 384 - Carmex - Inch Catalog 2022

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Mill-Thread Technical Section

Carmex Mill-Thread catalog and

CNC Tool Wizard

This software is provided by Carmex 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:
carmex.com

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.

General Program

G90 G00 G54 G43 H1X0 Y0 Z10 S---
G00 Z- ( TO THREAD DEPTH )
G01 G91 G41 D1 X(A/2) Y-(A/2) Z0 F---
G03 X(A/2) Y(A/2) R(A/2) Z(1/8 PITCH)
G03 X0 Y0 I-(A) J0 Z(PITCH)
G03 X-(A/2) Y(A/2) R(A/2) Z(1/8 PITCH)
G01 G40 X-(A/2) Y-(A/2) Z0
G90 X0 Y0 Z0
Internal Thread
EXAMPLE : 1 1/4 - 12UNF (Thread depth .71)
TOOLHOLDER : SR0790 H21 (Cutting Dia. .79)
INSERT: 21 I 12 UN
A = (1.25 - .79)/2 = .23
G90 G00 G54 G43 H1X0 Y0 Z0.39 S2800
G00 Z-0.71
G01 G91 G41X0.1150 Y-0.1150 Z0 F3.35 D1
G03 X0.1150
Y0.1150 R0.1150 Z0.0104
G03 X0 Y0 I-0.23 J0 Z0.0833
G03 X-0.1150 Y0.1150 R0.1150 Z0.0104
G01 G40 X-0.1150 Y-0.1150 Z0
G90 G0 X0 Y0 Z0

B12-4