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USER GUIDE
THREAD MILLING TOOLS

Thread Milling CNC Program
for Internal Thread
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.

A = Do – D A = Radius of tool path Y+
2 Do = Major thread diameter
D = Cutting diameter

General Program
G90 G00 G54 G43 H1X0 Y0 Z10 S... Major thread Dia.
G00 Z-(to thread depth) DO
G01 G91 G41 D1 X(A/2) Y-(A/2) Z0 F... X- X+
G03 X(A/2) Y(A/2) R(A/2) Z(1/8 pitch) D
A/2
G03 X0 Y0 I-(A) J0 Z(pitch) A A/2
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 Tool Path

Internal Thread Y-
Example: M 48x2.0 IN-RH (Thread depth 25 mm)
Toolholder: MTSR0029 J30
(Cutting dia. 29 mm)
Insert: MT30 I2.0ISO
A=(Do-D)/2=(48-29)/2=9.5
A/2=4.75
(Tool compensation of radius=0)
G90 G0 G54 G43 G17 H1X0 Y0 Z10 S1320
G0 Z-25
G01 G91 G41 D1X 4.75 Y-4.75 Z0 F41
G03 X4.75 Y4.75 R4.75 Z0.25
G03 X0 Y0 I-9.5 J0 Z2.0
G03 X-4.75 Y4.75 R4.75 Z0.25
G01 G40 X-4.75 Y-4.75 Z0
G90 G0 X0 Y0 Z0
M30
%

Internal Thread External Thread

Right-Hand Left-Hand Right-Hand Left-Hand
Thread Thread Thread Thread

A thread milling operation is applicable for thread cutting
in non-symmetrical parts utilizing the advantage of helical
interpolation programs on modern machining centers.

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