Please Note While Programming - HEIDENHAIN TNC 640 User Manual

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Please note while programming:

The first block in the contour subprogram must contain
values in all of the three axes X, Y and Z.
If you program APPR and DEP blocks for approach and
departure, the TNC monitors whether the execution of
these blocks would damage the contour
The algebraic sign for the depth parameter determines
the working direction. If you program depth = 0, the
TNC executes the cycle using the tool axis coordinates
defined in the contour subprogram.
If you use Cycle 25 CONTOUR TRAIN, you can only
define one subprogram in Cycle CONTOUR.
It is recommended to use Cycle 270 CONTOUR TRAIN
DATA in conjunction with Cycle 276. Cycle 20 CONTOUR
DATA is not required.
When you use local QL Q parameters in a contour
subprogram you must also assign or calculate these in
the contour subprogram.
The memory capacity for programming an SL cycle is
limited. You can program up to 16384 contour elements
in one SL cycle.
If M110 is activated during operation, the feed rate
of compensated circular arcs within will be reduced
accordingly.
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Fixed Cycles: Contour Pocket | THREE-D CONT. TRAIN (Cycle 276, DIN/ISO: G276)
HEIDENHAIN | User's manual for cycle programming | 10/2017