More G98 G99 Set Canned Cycle Return Level

RS274/NGC G-code Reference

Set Canned Cycle Return Level — G98 and G99

When the spindle retracts during canned cycles, there is a choice of how far it retracts: (1) retract perpendicular to the selected plane to the position indicated by the R word, or (2) retract perpendicular to the selected plane to the position that axis was in just before the canned cycle started (unless that position is lower than the position indicated by the R word, in which case use the R word position).
To use option (1), program G99. To use option (2), program G98. Remember that the R word has different meanings in absolute distance mode and incremental distance mode.


G98 G99 Set Canned Cycle Return Level