HEIDENHAIN ITNC 530 - CYCLE PROGRAMMING User Manual page 207

Please note while programming:
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program DEPTH
= 0, the cycle will not be executed.
When you use Cycle 275 TROCHOIDAL SLOT, you can define
only one contour program in Cycle 14 CONTOUR GEOMETRY.
Define the center line of the slot with all available path
functions in the contour subprogram.
The memory capacity for programming an SL cycle is
limited. You can program up to 8192 contour elements in
one SL cycle.
The TNC does not need Cycle 20 CONTOUR DATA in
conjunction with Cycle 275.
The miscellaneous functions M109 and M110 are not
effective when machining a contour with Cycle 275.
Danger of collision!
To avoid collisions,
Do not program positions in incremental dimensions
immediately after Cycle 275 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 main
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.
HEIDENHAIN iTNC 530 207