Thread Milling - HEIDENHAIN ITNC 530 - CYCLE PROGRAMMING User Manual

4.6 THREAD MILLING (Cycle 262,
DIN/ISO: G262)
Cycle run
1 The TNC positions the tool in the spindle axis at rapid traverse FMAX
to the entered setup clearance above the workpiece surface.
2 The tool moves at the programmed feed rate for pre-positioning to
the starting plane. The starting plane is derived from the algebraic
sign of the thread pitch, the milling method (climb or up-cut milling)
and the number of threads per step.
3 The tool then approaches the thread diameter tangentially in a
helical movement. Before the helical approach, a compensating
motion of the tool axis is carried out in order to begin at the
programmed starting plane for the thread path.
4 Depending on the setting of the parameter for the number of
threads, the tool mills the thread in one helical movement, in
several offset movements or in one continuous movement.
5 After this, the tool departs the contour tangentially and returns to
the starting point in the working plane.
6 At the end of the cycle, the TNC retracts the tool at rapid traverse
to the setup clearance, or—if programmed—to the 2nd setup
clearance.
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