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M21 Tailstock Barrier ON
Okuma OSP M-code · Mill and lathe
Tailstock Barrier ON or spindle interference monitoring ON (opposed two-spindle models)
Machine builders set many M codes, and they change by model and options. Check the M code list for your machine.
M21 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Haas NGC | Tailstock advance |
| Doosan (Fanuc) | Optional block skip act |
| DMG Mori MAPPS (Fanuc) | External output |
| Mazak (EIA) | Robot service call |
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