Please Note While Programming - HEIDENHAIN TNC 640 User Manual

Cycles: Special Functions | INTERPOLATION TURNING, CONTOUR FINISHING (Cycle 292, DIN/ISO: G292,
software option 96)

Please note while programming:

A programming example is provided at the end of this chapter, See
page 355.
This feature must be enabled and adapted by the
machine tool builder.
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 contours the TNC checks whether the active
tool radius is less than half the diameter at the start
of contour Q491 plus the set-up clearance on the side
Q357 . If this test shows that the tool is too large, the
program is canceled.
Please keep in mind that the axis angle must be equal
to the tilt angle before calling the cycle. Only then is
correct coupling of the axes possible.
If Cycle 8 MIRRORING is active, the TNC does
perform the cycle for interpolation turning.
If Cycle 26 AXIS-SPECIFIC SCALING is active, and the
scaling factor for the axis does not equal 1, the TNC
does not perform the cycle for interpolation turning.
HEIDENHAIN | User's manual for cycle programming | 10/2017
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