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G99 Canned cycle return to R plane / Feed per revolution
Mitsubishi M70 M80 G-code · Mill, Lathe
On mills: Canned cycle return to R plane
After each hole, the tool returns to the R plane. Faster when nothing is in the way.
Format
G99
How it works
Modal, group 10.
Example program
G00 Z1. (INITIAL LEVEL)
G99 G81 X1. Y1. Z-.25 R.1 F10. (RETURN TO R)
X2. (NEXT HOLE)
G80 (CANCEL)
G99 G81 X1. Y1. Z-.25 R.1 F10. (RETURN TO R)
X2. (NEXT HOLE)
G80 (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Switch to G98 for the move over a clamp.
On lathes: Feed per revolution
In G code list 2, G99 makes F inches per revolution. Default for turning.
Format
G99
How it works
Modal, group 05.
Example program
G99 (FEED PER REV)
G01 Z-1. F.008 (.008 IPR)
X2.2 (FACE OUT)
G01 Z-1. F.008 (.008 IPR)
X2.2 (FACE OUT)
Example is in inch. Check offsets and clearances first.
Watch out for
- In list 2, G98 and G99 are feed modes, not canned cycle return like on the mill.
Related codes
G99 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Canned cycle return to R level |
| Haas NGC | Canned cycle R plane return |
| Mazak (EIA) | Canned cycle return to R plane |
| Brother Speedio | Canned cycle return to R plane |
| Heidenhain TNC (ISO) | Tool definition in the program |
| Fagor 8055 8065 | Return to reference plane |
| LinuxCNC Tormach | Cycle retract to R plane |
| Mach3 Mach4 | Cycle return to R plane |
| Centroid CNC12 Acorn | Canned cycle return to R plane |
| Hurco WinMax (NC) | Cycle return to R plane |
| Fadal | Fixed cycle return to R0 plane |
| Swiss (Citizen Star) | Feed per revolution |
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