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G87 Back boring cycle
Brother Speedio G-code · Mill
Fanuc style back bore. Orients, shifts, goes below the part, shifts back and cuts upward.
Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.
Format
G87 X Y Z R Q F
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Top of the back bore |
R | Start point below the part |
Q | Shift amount |
F | Feed rate |
How it works
Modal, canned cycle. Cancel with G80.
Example program
G100 T09 G90 G54 G00 X1. Y1. G43 H09 Z1. S800 M03 (BACK BORE BAR)
G87 Z-.5 R-1.1 Q.1 F4. (BACK BORE)
G80 G00 Z1. (CANCEL)
G87 Z-.5 R-1.1 Q.1 F4. (BACK BORE)
G80 G00 Z1. (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Check the shift direction with a dry run. A wrong shift hits the bore wall.
Related codes
G87 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Back boring cycle |
| Haas NGC | Boring cycle, stop and manual retract |
| Mazak (EIA) | Side drilling cycle, live tool |
| Okuma OSP | Back boring cycle |
| Mitsubishi M70 M80 | Back boring cycle |
| Fagor 8055 8065 | Rectangular pocket canned cycle |
| LinuxCNC Tormach | Back boring cycle, not implemented |
| Mach3 Mach4 | Back boring |
| Hurco WinMax (NC) | Back bore (ISNC) or chip breaker (BNC) |
| Fadal | Bore in and out, Fadal G87 |
| Swiss (Citizen Star) | Side drilling cycle |
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