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G98 Canned cycle return to start height / Feed per minute
Centroid CNC12 Acorn G-code · Mill, Lathe
On mills: Canned cycle return to start height
After each hole the tool returns to the height it had before the cycle started. This is the default.
Format
Addresses
| Address | What it does |
|---|---|
none | No words |
How it works
Modal, return group. Default.
Example program
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
- Use G98 to clear clamps between holes.
On lathes: Feed per minute
F becomes units per minute. Used for live tooling or moves with the spindle off.
Format
Addresses
| Address | What it does |
|---|---|
none | No words |
How it works
Modal, feed group.
Example program
T0101 ; TOOL 1 WITH OFFSET 1
G98 ; FEED PER MINUTE
G1 Z-.5 F10. ; 10 INCH PER MINUTE
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- On the lathe G98 and G99 are feed modes, not drill return modes like the mill.
- Go back to G99 before turning.
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 |
| Mitsubishi M70 M80 | Canned cycle return to start level |
| 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 |
| 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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