The G88 boring is used rare, its use is limited to boring
operations with special tools that requires manual interface at the bottom of
the hole. When this operation is
completed, the tool is moved out of the hole for safety reasons. This cycle is
used by some tool manufactures for certain operations.
Code line for G88 Boring cycle Spindle stop:
N100 G98 (G99) G88 X… Y… R… Z… P… F…
Diagram for G88 Boring cycle Spindle stop:
Steps for the G88 Boring cycle Spindle stop:
2.
Rapid motion to the R level, i.e., to the top of
the hole position.
3.
Feedrate motion to the depth in Z.
4.
Dwell at the depth – in milli seconds (P).
5.
Spindle rotation STOP (Feed hold condition is
generated and the CNC operator switch's to manual operation mode and performs a
manual task, then switches back to memory mode). CYCLE START will return to
normal cycle.
6.
Rapid retract to the initial level (with G98) or
Rapid retract to R level (with G99).
7.
Spindle rotation ON.