HEIDENHAIN ITNC 530 - CYCLE PROGRAMMING User Manual page 231

Please note while programming:
The machine and TNC must be prepared for cylinder
surface interpolation by the machine tool builder. Refer to
your machine tool manual.
In the first NC block of the contour program, always
program both cylinder surface coordinates.
Ensure that the tool has enough space laterally for contour
approach and departure.
The memory capacity for programming an SL cycle is
limited. You can program up to 8192 contour elements in
one SL cycle.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program DEPTH
= 0, the cycle will not be executed.
The cylinder must be set up centered on the rotary table.
The tool axis must be perpendicular to the rotary table. If
this is not the case, the TNC will generate an error
message.
This cycle can also be used in a tilted working plane.
HEIDENHAIN iTNC 530 231