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M91 Move to minus home switch
Centroid CNC12 Acorn M-code · Mill and lathe
Moves the named axis to its minus home switch at slow jog, backs off until the switch clears and stops at the index pulse.
Format
M91 /axis
Addresses
| Address | What it does |
|---|---|
axis | Axis letter after a slash |
How it works
One shot.
Example program
M91 /X ; X TO MINUS HOME
M26 /X ; SET HOME
G0 X1. ; MOVE AWAY
M26 /X ; SET HOME
G0 X1. ; MOVE AWAY
Example is in inch. Check offsets and clearances first.
Watch out for
- The switch must clear within .25 inch or 45 degrees or an error occurs.
Machine builders set many M codes, and they change by model and options. Check the M code list for your machine.
Related codes
M91 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Haas NGC | Fixture clamp input off |
| Doosan (Fanuc) | External m-code m91 |
| DMG Mori MAPPS (Fanuc) | Tool-spindle or turning spindle simultaneous operation mode OFF |
| Heidenhain TNC (ISO) | Coordinates in machine datum |
| Hurco WinMax (NC) | Z retract on power loss, disable |
| Fadal | Normal servo gain |
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Open M91 in the app All Centroid CNC12 Acorn M-codes