Smithy CNC Mills - Manual (Page 113)

6. If speed-feed synch was not on before the cycle started, stop it.
7. Stop the spindle.
8. Start the spindle clockwise.
1.7 G85 Cycle
The G85 cycle is intended for boring or reaming.
0. Preliminary motion, as described above.
1. Move the Z-axis only at the current feed rate to the Z position.
2. Retract the Z-axis at the current feed rate to clear Z. This motion is very simi-
lar to g81 except that the tool is retracted from the hole at feedrate rather than
rapid.
10.8 G86 Cycle
The G86 cycle is intended for boring.
0. Preliminary motion, as described above.
1. Move the Z-axis only at the current feed rate to the
Z position.
2. Dwell for the given number of seconds.
3. Stop the spindle turning.
4. Retract the Z-axis at traverse rate to clear Z.
5. Restart the spindle in the direction it was going. This cycle is very similar to
g82 except that it stops the spindle before it retracts the tool and restarts
the spindle when it reaches the clearance value R.
1.9 G87 Cycle
The G87 cycle is intended for back boring.
The situation is that you have a through hole and you want to counter bore the
bottom of hole. To do this you put an L-shaped tool in the spindle with a cutting
SmithyCNC Programmer’s Reference Manual: Mill Canned Cycles
SmithyCNC Programmer’s Reference Manual: Mill Canned Cycle 10-10