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M109 Disable override knobs
Centroid CNC12 Acorn M-code · Mill and lathe
Locks feed override, spindle override or both at 100 percent. Use it before tapping with G85 and a tapping head. G74 and G84 do this on their own.
Format
M109 /1 [/2]
Addresses
| Address | What it does |
|---|---|
1 | Feed override |
2 | Spindle override |
How it works
Modal. Cancel with M108.
Example program
M3 S500 ; SPINDLE ON
F27.78 ; 18 PITCH FEED
M109 /1 /2 ; LOCK OVERRIDES
G85 X0 Y0 R.1 Z-.5 ; TAP
…
F27.78 ; 18 PITCH FEED
M109 /1 /2 ; LOCK OVERRIDES
G85 X0 Y0 R.1 Z-.5 ; TAP
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- M109 does not work in MDI.
Machine builders set many M codes, and they change by model and options. Check the M code list for your machine.
Related codes
M109 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Haas NGC | Interactive user input |
| Doosan (Fanuc) | T.S.C coolant off(left spindle) |
| Mazak (EIA) | Workpiece measurement DIS end |
| Okuma OSP | Cancel of M110 |
| Heidenhain TNC (ISO) | Constant feed at the cutting edge |
Every M-code for Centroid CNC12 Acorn in your pocket. The app has the full example programs, search by number or shop word, a line decoder and calculators for tapping, threading and drilling.
Open M109 in the app All Centroid CNC12 Acorn M-codes