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M108 Enable override knobs
Centroid CNC12 Acorn M-code · Mill and lathe
Turns feed override, spindle override or both back on after M109. 1 is feed and 2 is spindle.
Format
M108 /1 [/2]
Addresses
| Address | What it does |
|---|---|
1 | Feed override |
2 | Spindle override |
How it works
Modal.
Example program
M109 /1 /2 ; LOCK OVERRIDES
G85 X1. Y1. R.1 Z-.4 ; TAP WITH A TAPPING HEAD
M108 /1 /2 ; UNLOCK OVERRIDES
G80
G85 X1. Y1. R.1 Z-.4 ; TAP WITH A TAPPING HEAD
M108 /1 /2 ; UNLOCK OVERRIDES
G80
Example is in inch. Check offsets and clearances first.
Watch out for
- Always turn overrides back on after the tapping section.
Machine builders set many M codes, and they change by model and options. Check the M code list for your machine.
Related codes
M108 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Doosan (Fanuc) | T.S.C coolant on (left spindle) |
| Mazak (EIA) | Workpiece measurement DIS start (chuck barrier release) |
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