Siemens sinumerik 808d Programming And Operating Manual page 182

Cycles
2.5 Turning cycles
Function
This cycle can be used to produce several cylindrical or tapered threads in succession. The
individual thread sections can have different leads whereby the lead within one and the
same thread section must be constant.
Sequence
Position reached prior to cycle start:
Starting position is any position from which the programmed thread starting point + run-in
path can be approached without collision.
The cycle creates the following sequence of motions:
● Approach of the starting point determined in the cycle at the beginning of the run-in path
● Infeed for roughing according to the infeed type defined under VARI.
● Thread cutting is repeated according to the programmed number of roughing cuts.
● The finishing allowance is removed in the following step with G33.
● This step is repeated according to the number of idle passes.
● The whole sequence of motions is repeated for each further thread turn.
182
for the first thread turn with G0
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0