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G81 Drilling cycle
Brother Speedio G-code · Mill
Feeds to Z depth and rapids out. Use for spot drills and short holes.
Format
G81 X Y Z R F
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Hole bottom |
R | R plane |
F | Feed rate |
How it works
Modal, canned cycle. Cancel with G80.
Example program
G100 T01 G90 G54 G00 X1. Y1. G43 H01 Z1. S4000 M03 (SPOT DRILL)
G99 G81 Z-.1 R.1 F15. (SPOT)
X2. (HOLE 2)
G80 G00 Z1. (CANCEL)
G99 G81 Z-.1 R.1 F15. (SPOT)
X2. (HOLE 2)
G80 G00 Z1. (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Z is the tip depth. Add the drill point length for full diameter depth.
Related codes
G81 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Drilling cycle |
| Haas NGC | Drill canned cycle |
| Mazak (EIA) | Drilling cycle, spot drill |
| Okuma OSP | Drill or spot cycle |
| Mitsubishi M70 M80 | Drilling cycle |
| Fagor 8055 8065 | Drilling canned cycle |
| LinuxCNC Tormach | Drill cycle |
| Mach3 Mach4 | Drill cycle |
| Centroid CNC12 Acorn | Drilling cycle |
| Hurco WinMax (NC) | Drill or spot drill cycle |
| Fadal | Drill, spot drill |
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