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G99 Cycle return to R plane
Mach3 Mach4 G-code · Mill
After each hole the cycle returns only to R. Faster on flat plates with no obstacles.
Format
G99
Addresses
| Address | What it does |
|---|---|
G99 | No address words |
How it works
Modal, return mode group.
Example program
G0 G20 G90 G54 G17 G40 G49 G80 (SAFE START, INCH)
T1 M6 (TOOL CHANGE)
S2500 M3 (SPINDLE ON)
G43 H1 Z0.5 (LENGTH OFFSET)
…
T1 M6 (TOOL CHANGE)
S2500 M3 (SPINDLE ON)
G43 H1 Z0.5 (LENGTH OFFSET)
…
The full 7-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Clamps between holes get hit at R height. Switch to G98 for those moves.
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 |
| 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 |
| 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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Open G99 in the app All Mach3 Mach4 G-codes