HEIDENHAIN TNC 640 (34059x-05) Cycle programming - Manual (Page 287)

CONTOUR TURNING INTERPOLATION (Cycle 292, DIN/ISO: G292,
software option 96)
11.6
11
TNC 640 | User's Manual Cycle Programming | 1/2015
287
Cycle run, Q560=0: Contour milling
1 The M3/M4 function programmed before the cycle call remains
in effect.
2 No spindle stop and no spindle orientation are performed. Q336
is not taken into account.
3 The TNC positions the tool to the contour start radius Q491,
taking the selected machining operation inside/outside Q529
and the clearance to side Q357 into account. The described
contour is not automatically extended by a set-up clearance.
An extension of the contour must be programmed in the
subprogram. At the beginning of the machining operation, the
TNC positions the tool at rapid traverse in the tool axis direction
to the contour starting point!
Make sure that there is no
material at the contour starting point!
4 The TNC machines the defined contour with the spindle rotating
(M3/M4). In the process, the reference axes of the working
plane move on a circle; the TNC does not orient the tool spindle.
5 At the end point of the contour, the TNC retracts the tool
perpendicularly by the set-up clearance.
6 Finally, the TNC retracts the tool to the clearance height.