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G81 Drilling cycle
Mitsubishi M70 M80 G-code · Mill
Feeds to Z and rapids out. Used for spot drilling and shallow 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 group 09. Cancel with G80.
Example program
T1 M06 (SPOT DRILL)
G90 G54 G00 X1. Y1. S3000 M03 (START)
G43 H01 Z1. M08 (LENGTH COMP)
G99 G81 Z-.1 R.1 F10. (SPOT)
…
G90 G54 G00 X1. Y1. S3000 M03 (START)
G43 H01 Z1. M08 (LENGTH COMP)
G99 G81 Z-.1 R.1 F10. (SPOT)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- G98 returns to the start level, G99 to the R plane between holes.
- In G91, Z is from the R plane and R is from the start level.
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 |
| Brother Speedio | 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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Open G81 in the app All Mitsubishi M70 M80 G-codes