HEIDENHAIN MANUALplus 4110 - Manual (Page 336)

336 6 DIN Programming
6.15 Thr
ead Cy
cles
„ G31 with contour definition: "X, Z" is not programmed. G31 is
followed by NC blocks defining up to 6 contour elements on which
the thread is to be machined. Contour definition is completed with
G80.
Transverse threads or successive threads are programmed "with
contour definition."
Internal or external threads: See algebraic sign of "U."
The infeeds are calculated on the basis of "V:"
„ V=0: Constant cross section for all cuts. "I" defines the first
(maximum) infeed. All further infeeds are executed in such a way
that the same cross section as for the first cut is used.
„ V=1: The thread is machined with constant infeeds <=I.
„ V=2: If the division U/I provides a remainder, the first feed is
reduced. The last cut is divided into four partial cuts: 1/2, 1/4, 1/8 and
1/8
„ V=3: If the division U/I provides a remainder, the first feed is
reduced.
„ Transverse threads:
„ Are machined with recessing tools.
„ The difference in radii must be programmed.
„ "Cycle STOP" becomes effective at the end of a thread
cut.
„ Feed rate override is not effective during cycle
execution.
„ Feed forward control is switched on.