HEIDENHAIN TNC 640 (34059x-05) Cycle programming - Manual (Page 288)

Cycles: Special Functions
11.6 CONTOUR TURNING INTERPOLATION (Cycle 292, DIN/ISO: G292,
software option 96)
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TNC 640 | User's Manual Cycle Programming | 1/2015
Please note while programming:
A programming example is provided at the end of this chapter, see
page 313.
Program the contour either with monotonically
decreasing or monotonically increasing coordinates.
When programming, remember to use only positive
radius values.
Program the turning contour without tool radius
compensation (RR/RL) and without APPR or DEP
movements.
When programming, remember that neither the
spindle center nor the indexable insert must be
moved into the center of the turning contour.
Program outside contours with a radius greater than
0.
Program inside contours with a radius greater than
the tool radius.
Roughing operations with multiple passes are not
possible in this cycle.
Before cycle call, define a large tolerance with Cycle
32 for your machine to attain high contour speeds.
Program Cycle 32 with HSC filter=1.
For inside machining, the TNC checks whether the
active tool radius is smaller than half the contour
start diameter Q491 plus the clearance to side Q357.
If the check shows that the tool is too large, the
program is aborted.
If Cycle 8 MIRRORING is active, the TNC does not
execute the interpolation turning cycle.
If Cycle 26 SCALING FACTOR is active and the
scaling factor in an axis is not equal to 1, the TNC
does
not execute the interpolation turning cycle.