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G98 Canned cycle return to start level / Feed per minute
Mitsubishi M70 M80 G-code · Mill, Lathe
On mills: Canned cycle return to start level
After each hole, the tool returns to the Z level it had before the cycle started.
Format
G98
How it works
Modal, group 10.
Example program
G00 Z1. (INITIAL LEVEL ABOVE CLAMPS)
G98 G81 X1. Y1. Z-.25 R.1 F10. (RETURN TO Z1)
X4. (NEXT HOLE PAST CLAMP)
G80 (CANCEL)
G98 G81 X1. Y1. Z-.25 R.1 F10. (RETURN TO Z1)
X4. (NEXT HOLE PAST CLAMP)
G80 (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Use G98 to clear clamps between holes.
On lathes: Feed per minute
In G code list 2, G98 makes F inches per minute. Used for live tools and bar pullers.
Format
G98
How it works
Modal, group 05.
Example program
G98 (FEED PER MINUTE)
G01 Z-2. F20. (20 IPM)
G99 (BACK TO PER REV)
G01 Z-2. F20. (20 IPM)
G99 (BACK TO PER REV)
Example is in inch. Check offsets and clearances first.
Watch out for
- Restate F after switching. A per rev value in per minute mode barely moves.
Related codes
G98 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Canned cycle return to initial level |
| Haas NGC | Canned cycle initial point return |
| Mazak (EIA) | Canned cycle return to initial point |
| Brother Speedio | Canned cycle return to initial point |
| Heidenhain TNC (ISO) | Set label |
| Fagor 8055 8065 | Return to initial plane |
| LinuxCNC Tormach | Cycle retract to start height |
| Mach3 Mach4 | Cycle return to initial point |
| Centroid CNC12 Acorn | Canned cycle return to start height |
| Hurco WinMax (NC) | Cycle return to initial point |
| Fadal | Fixed cycle return to start plane |
| Swiss (Citizen Star) | Feed per minute |
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