The gcode G73 chip breaking cycle works same as deep hole drilling
cycle G83and is also known as peck drilling cycle. But In this cycle the drill
will not be retracted to the clearance position of the hole, the drill will
retract only to specified height after drilling the certain depth of cut
keeping the drill inside the hole. This cycle retracts to the specified height
after each peck of drill and repeated until the total depth of the hole is
achieved.
The
cycle G73 is used for the long series of the drills where we can expect the
vibration of the tool and it can damage the hole and the tool. G73 cycle keeps
the tool inside the hole until the drilling operation is completed and saving
the time on the cycle.
Code line for G73 Chip break drilling cycle:
N100 G98 (G99) G73 X… Y… R… Z… Q… F…
Diagram for G73 Chip break drilling cycle:
Steps for the G73 Chip break drilling cycle:
2.
Rapid motion to the R level, i.e., to the top of
the hole position.
3.
Feedrate motion to the depth by the amount of Q
value in Z.
4.
Rapid retract to Clearance value Specified.
5.
Feedrate motion in Z axis by the Q amount plus
the clearance value.
6.
Point number 4 and 5 repeated until the z depth
of the hole is reached.
7.
Rapid retract to the initial level (with G98) or
Rapid retract to R level (with G99).