HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 311)

TURN SHOULDER LONGITUDINAL EXTENDED
(Cycle 812, DIN/ISO: G812)
13.6
13
TNC 640 | User's Manual Cycle Programming | 3/2014
311
Finishing cycle run
If the starting point lies in the area to be machined, the TNC
positions the tool beforehand to set-up clearance in the Z
coordinate.
1 The TNC runs the paraxial infeed motion at rapid traverse.
2 The TNC finishes the finished part contour (contour starting
point to contour end point) at the defined feed rate Q505.
3 The TNC returns the tool to set-up clearance at the defined feed
rate.
4 The TNC positions the tool back at rapid traverse to the cycle
starting point.
Please note while programming:
Program a positioning block to a safe 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).