HEIDENHAIN iTNC 530 (340 49x-03) ISO programming - Manual (Page 291)

HEIDENHAIN iTNC 530 291
8.2 P
o
int T
ables
Effect of the point tables with Cycles G251 to G254
The TNC interprets the points of the working plane as coordinates of
the cycle starting point. If you want to use the coordinate defined in
the point table for the spindle axis as the starting point coordinate, you
must define the workpiece surface coordinate (Q203) as 0.
Applies to all 2xx cycles
As soon as the current tool axis position lies below the
clearance height in with G79 PAT the TNC displays the
error message PNT: Clearance plane too small. The
clearance height is calculated from the sum of the
workpiece surface coordinate (Q203) and the 2nd set-up
clearance (Q204, or set-up clearance Q200, if the value of
Q200 is greater than Q204).