HEIDENHAIN TNC 640 (34059x-01) Cycle programming - Manual (Page 326)

326 Cycles: Turning
13.15 TURN CONT
OUR, TRANS
V
ER
SE (Cy
c
le 820)
Finishing cycle run
If the Z coordinate of the starting point is less than the contour starting
point, the TNC positions the tool in the Z coordinate to set-up
clearance and begins the cycle there.
1 The TNC runs the 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:
The cutting limit defines the contour range to be
machined. The approach and departure paths can exceed
the cutting limits.
The tool position before the cycle call influences the
execution of the cutting limit. The TNC 640 machines the
area to the right or to the left of the cutting limit,
depending on which side the tool has been positioned
before the cycle is called.
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.
The TNC takes the cutting geometry of the tool into
account to prevent damage to contour elements. If
complete machining with the active tool is not possible, a
warning is output by the TNC.
Before calling the cycle you must program the cycle 14
CONTOUR GEOMETRY
to define the subprogram number.
Also refer to the fundamentals of turning cycles (see
page 286).