HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 330)

Cycles: Turning
13.11 TURN SHOULDER FACE
(Cycle 821, DIN/ISO: G821)
13
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TNC 640 | User's Manual Cycle Programming | 3/2014
Finishing cycle run
1 The TNC traverses the tool in the Z coordinate by the set-up
clearance
Q460. The movement is performed at rapid traverse.
2 The TNC runs the paraxial infeed motion at rapid traverse.
3 The TNC finishes the finished part contour at the defined feed
rate
Q505.
4 The TNC returns the tool to set-up clearance at the defined feed
rate.
5 The TNC positions the tool back at rapid traverse to the cycle
starting point.
Please note while programming:
Program a positioning block to the starting position
with radius compensation
R0 before the cycle call.
The tool position at cycle call (cycle starting point)
affects the area to be machined.
Also refer to the fundamentals of turning cycles (see
page 307).