Siemens sinumerik 808d Programming And Operating Manual page 186

Cycles
2.5 Turning cycles
_VRT (variable retraction path)
The retraction path can be programmed on the basis of the initial thread diameter in the
_VRT parameter. For _VRT = 0 (parameter not programmed), the retraction path is 1 mm.
The retraction path is always measured according to the programmed measuring system,
inch or metric.
Programming example: Thread chain
You can use this program to produce a thread chain starting with a cylindrical thread. The
infeed is performed vertically to the thread; neither finishing allowance, nor starting point
offset are programmed. Five roughing cuts and one noncut are performed. The machining
type is defined as longitudinal, external, with constant cross-section of cut.
N10 G95 T5 D1 S1000 M4
N20 G0 X40 Z10
N30 CYCLE98 (0, 30, -30, 30, -60, 36, -80, 50,
10, 10, 0.92, , , , 5, 1, 1.5, 2, 2, 3, 1,)
N40 G0 X55
N50 Z10
N60 X40
N70 M2
186
; Specification of technology
values
; Approach starting position
; Cycle call
; Traverse axis by axis
; End of program
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0