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M109 Constant feed at the cutting edge
Heidenhain TNC (ISO) M-code · Mill
Keeps the feed constant at the tool cutting edge on arcs, raising feed on inside arcs and lowering it on outside arcs.
Format
M109
Addresses
| Address | What it does |
|---|---|
M109 | No addresses |
How it works
Modal. Cancel with M111.
Example program
N50 G01 G41 X+10 Y+10 F400 M109 *
N60 G02 X+50 Y+10 R+20 *
N70 M111 *
N60 G02 X+50 Y+10 R+20 *
N70 M111 *
Example is in inch. Check offsets and clearances first.
Watch out for
- M110 only lowers the feed on inside arcs and never raises it.
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 |
| Centroid CNC12 Acorn | Disable override knobs |
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