HEIDENHAIN SW 54843x-03 DIN Programming - Manual (Page 125)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 125
2.8 Units—Thr
eads
2.8 Units—Threads
Overview of thread units
 "Thread, direct" cuts a simple internal or external thread in
longitudinal direction.
 "ICP thread" cuts a single or multi-start internal or external thread
in longitudinal or transverse direction. The contour on which the
thread is cut is defined with ICP.
 "API thread" cuts a single or multi-start API thread. The depth of
thread decreases at the overrun at the end of thread.
 "Tapered thread" cuts a single or multi-start tapered internal or
external thread.
Handwheel superimposition
If your machine features handwheel superimposition, you can overlap
axis movements during thread cutting in a limited area:
 X direction: Maximum programmed thread depth depending on the
current cutting depth
 Z direction: +/- a fourth of the thread pitch
Machine and control must be specially prepared by the
machine tool builder for use of this cycle. Refer to your
machine manual.
Remember that position changes resulting from
handwheel superimposition are no longer effective after
the cycle end or the "last cut" function.