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G99 Canned cycle return to R plane / Feed per revolution
Centroid CNC12 Acorn G-code · Mill, Lathe
On mills: Canned cycle return to R plane
After each hole the tool returns only to the R plane. Faster when there is nothing in the way.
Format
G99
Addresses
| Address | What it does |
|---|---|
none | No words |
How it works
Modal, return group.
Example program
G20 G17 G40 G49 G80 G90 ; INCH, SAFE START
T1 M6 ; LOAD TOOL 1, Z GOES HOME FIRST
G54 G0 X0 Y0 ; WORK OFFSET 1
S2500 M3
…
T1 M6 ; LOAD TOOL 1, Z GOES HOME FIRST
G54 G0 X0 Y0 ; WORK OFFSET 1
S2500 M3
…
The full 8-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Check for clamps and steps between holes. G99 stays at R height while moving.
On lathes: Feed per revolution
F becomes units per spindle revolution. This is the lathe default.
Format
G99
Addresses
| Address | What it does |
|---|---|
none | No words |
How it works
Modal, feed group. Default.
Example program
G20 G99 G40 G97 ; INCH, FEED PER REV, RPM MODE
T0101 ; TOOL 1 WITH OFFSET 1
G97 S1000 M3
G0 X1.1 Z.1
…
T0101 ; TOOL 1 WITH OFFSET 1
G97 S1000 M3
G0 X1.1 Z.1
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- F.008 means .008 inch per rev. Do not carry over mill style feed values.
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 |
| Mach3 Mach4 | 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 Centroid CNC12 Acorn G-codes