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G87 Back boring cycle
Mitsubishi M70 M80 G-code · Mill
Orients and shifts the bar, rapids below the part, shifts back and bores upward. Used for back counterbores.
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 P F
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Top of back bore |
R | Start point below the part |
Q | Shift amount |
F | Feed rate |
How it works
Modal, canned cycle group 09. Cancel with G80.
Example program
G90 G54 G00 X2. Y2. S500 M03 (START)
G43 H11 Z1. (LENGTH COMP)
G98 G87 Z-.5 R-1.2 Q.05 F3. (BACK BORE)
G80 G00 Z1. (CANCEL)
G43 H11 Z1. (LENGTH COMP)
G98 G87 Z-.5 R-1.2 Q.05 F3. (BACK BORE)
G80 G00 Z1. (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- The bar passes through the hole oriented. Check clearance for the shifted bar.
- Only G98 return makes sense here.
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 |
| Brother Speedio | 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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