Specifications

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CONCISE GUIDE FANUC 115
7.7 “G87” RADIAL DRILLING CYCLE
Function “G87” activates the side radial cycle with motor driven tools.
With this function the bit makes a series of cuts, of the required size, undercutting or breaking the chip
and returning with a rapid traverse at the end of cycle to the starting point or to point R.
The radial drilling cycle can contain these codes:
• X => Absolute value at end of drilling
• F => Drilling feed ( in mm/minute)
• Q => Depth of cut (in thousandths)
• P => Pause at bottom of hole ( in thousandths of seconds)
• R => Incremental distance from starting point of cycle to starting point of hole
Out of all the parameters described above, the only ones which are compulsory are X (end of drilling
value) and F (drilling feed), all the other parameters are only to be programmed if actually used.
If R parameter is used the distance between the starting point of cycle and the starting point of hole is
executed in rapid. Eventual discharges (parameter Q) occur at the starting point of hole, while at the end
of drilling the point comes back to the starting point of cycle.
If P parameter is used the pause is executed only on final point of drilling.
To leave the drilling cycle function G80 must be programmed, or any G function of the 01 group, i.e. G0,
G1, G2, or G3.