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USER GUIDE

Thread Milling CNC Program for Internal Thread Internal Thread
Right-hand thread (climb milling) from bottom up. Example: M 48x2.0 IN-RH
Program is based on tool center. (Thread depth 1.0”)
This method of programming needs no tool radius Toolholder: MTSR0029 J30
compensation value other than an offset for wear. (Cutting dia. 1.14”) THREAD MILLING TOOLS
Insert: MT30 I2.0ISO
A = Radius of tool path A =(Do-D)/2=(1.89-1.14)/2=.375
A = Do – D Do = Major thread diameter A/2 =.187
2
D = Cutting diameter (Tool compensation of radius=0)
G90 G0 G54 G43 G17 H1X0 Y0 Z10 S1320
G0 Z-25
General Program G01 G91 G41 D1X 4.75 Y-4.75 Z0 F41
G90 G00 G54 G43 H1X0 Y0 Z10 S... G03 X4.75 Y4.75 R4.75 Z0.25
G00 Z-(to thread depth) G03 X0 Y0 I-9.5 J0 Z2.0
G01 G91 G41 D1 X(A/2) Y-(A/2) Z0 F... G03 X-4.75 Y4.75 R4.75 Z0.25
G03 X(A/2) Y(A/2) R(A/2) Z(1/8 pitch) G01 G40 X-4.75 Y-4.75 Z0
G03 X0 Y0 I-(A) J0 Z(pitch) G90 G0 X0 Y0 Z0
G03 X-(A/2) Y(A/2) R(A/2) Z(1/8 pitch) M30
G01 G40 X-(A/2) Y-(A/2) Z0 %
G90 X0 Y0 Z0
Number of Radial Passes
In order to produce a thread, one radial
Y+ pass can be sufficient yet in other cases
several radial passes may be required.
The table below presents ISCAR's
recommendations for the number of radial
passes depending on the material and lead.
DO
Major thread Dia.
X- X+
D
A A/2
A/2
Tool Path

Y-

477