Page 439 - ISCAR(MILLINGCATALOG 38_2021)
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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 25 mm)
              This method of programming needs no tool radius   Toolholder:  MTSR0029 J30
              compensation value other than an offset for wear.  (Cutting dia. 29 mm)                                 THREAD MILLING TOOLS
                                                                Insert:  MT30 I2.0ISO
                                    A  = Radius of tool path    A   =(Do-D)/2=(48-29)/2=9.5
                A =  Do – D         Do = Major thread diameter  A/2  =4.75
                           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, in some cases
                                     Y+                         one radial pass is sufficient but other times a
                                                                number of radial passes are 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-






































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