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G99 Canned cycle R plane return / Feed per revolution
Haas NGC G-code · Mill, Lathe
On mills: Canned cycle R plane return
After each hole the tool returns to the R plane only. Saves time when there is nothing to clear between holes.
Format
G99
How it works
Modal, return group 10.
Example program
G81 G99 Z-.5 R.1 F10. (DRILL, RETURN TO R.1)
X2. (NEXT HOLE)
G98 X3. (RETURN HIGH AFTER THIS HOLE)
G80 (CANCEL)
X2. (NEXT HOLE)
G98 X3. (RETURN HIGH AFTER THIS HOLE)
G80 (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Switch to G98 on the hole before a clamp or tall feature.
On lathes: Feed per revolution
Makes F inches per spindle revolution, or mm per rev in metric. The normal mode for turning, threading and tapping.
Format
G99
How it works
Modal, group 10. Normal lathe default.
Example program
G00 G18 G20 G40 G80 G99 (SAFE STARTUP)
T0101 (OD TOOL)
G01 Z-1. F.01 (.010 IPR)
T0101 (OD TOOL)
G01 Z-1. F.01 (.010 IPR)
Example is in inch. Check offsets and clearances first.
Watch out for
- Put G99 in the safe startup line.
- Threading and tapping cycles need G99.
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 |
| Mazak (EIA) | Canned cycle return to R plane |
| Mitsubishi M70 M80 | 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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