HEIDENHAIN iTNC 530 (60642x-04) Cycle programming - Manual (Page 214)

214 Fixed Cycles: Contour Pocket, Contour Trains
7.
12 THREE-D CONT
OUR TRAIN (Cy
c
le 27
6, DIN/ISO:
G27
6
)
Please note while programming:
The first block in the contour subprogram must contain
values in all of the three axes X, Y and Z.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH=0, the TNC will execute the cycle using the tool
axis coordinates defined in the contour subprogram.
When using Cycle 25 CONTOUR TRAIN, you can define only
one contour subprogram in Cycle 14 CONTOUR GEOMETRY.
The memory capacity for programming an SL cycle is
limited. You can program up to 4090 contour elements in
one SL cycle.
The TNC does not need Cycle 20 CONTOUR DATA in
conjunction with Cycle 276.
Make sure that the tool is in the tool axis above the
workpiece when the cycle is called; otherwise the TNC
will issue an error message.
Use the CONTOUR TRAIN DATA cycle to define the machining
behavior of Cycle 276 (siehe „CONTOUR TRAIN DATA
(Cycle 270, DIN/ISO: G270)” auf Seite 202).
Danger of collision!
To avoid collisions,
 Before the cycle call, position the tool in the tool axis
such that the TNC can approach the starting point of the
contour without collision. If the actual position of the
tool is below the clearance height when the cycle is
called, the TNC will issue an error message.
 If you program APPR and DEP blocks for contour approach
and departure, the TNC monitors whether the execution
of these blocks would damage the contour.
 Do not program positions in incremental dimensions
immediately after Cycle 276 since they are referenced
to the position of the tool at the end of the cycle.
 Move the tool to defined (absolute) positions in all
principal axes, since the position of the tool at the end of
the cycle is not identical to the position of the tool at the
start of the cycle.
Enter in MP7441 bit 0 whether the TNC should output an
error message (bit 0=0) or not (bit 0=1) if spindle rotation
is not active when the cycle is called. The function also
needs to be adapted by your machine manufacturer.