Specifications

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CONCISE GUIDE FANUC 81
4.9 “G83” FRONT DRILLING CYCLE
Function “G83” activates the front drilling cycle.
With this function the bit makes a series of cuts, of the required size, undercutting or breaking the chip
and returning, at the end of cycle, in rapid traverse to the starting point.
The front drilling cycle can contain these codes:
• Z => End of drilling absolute value
• F => Drilling feed ( in mm/rev.)
• Q => Depth of cut (in thousandths)
• P => Pause on bottom of hole (in thousandths of second)
Example:
N12 T303 (DRILLING)
N13 G54
N14 G97 S800 M3
N15 G0 X0 Z5 M8
N16 G83 Z-50 F0.12 Q1000
N17 G0 X200 Z200
Codes Q and P if not used, need not be written.
This cycle can be used to break or undercut chips according to the value of parameter 5101 bit 2 (RTR),
with value 0 chip breaking, with value 1 chip undercutting, by default this bit is set to 1 therefore for chip
undercutting.