ALARM 251

Milling motor rotation prohibited

Milling spindle rotation commanded while the chuck was not closed, the milling tool was not clamped, the B-axis was not clamped, or the door was open with do...

Controls: T-Plus, T-32
Machine series: Quick Turn (live tooling), Integrex

Causes

Milling spindle rotation commanded while the chuck was not closed, the milling tool was not clamped, the B-axis was not clamped, or the door was open with door interlock set to AUTO
- HelmanCNCindustry_blog
  A milling spindle rotation command can be given even though: the chuck was not closed, the milling tool was not clamped, the milling head (B-axis) was not clamped, or the door was not closed when the door interlock switc…
M203/M204/M219 commanded in turning mode
- HelmanCNCindustry_blog
  The alarm can also occur if the M203, M204 or M219 command was given in turning mode.

How to clear it

1
Close the chuck via chuck-clamp command, then re-issue milling spindle rotation
- HelmanCNCindustry_blog
  After closing the chuck using the chuck clamp command, designate the milling spindle rotation command.
2
Close the door, then start milling spindle rotation
- HelmanCNCindustry_blog
  Close the door and start the milling spindle rotation.

Additional notes

Companion alarm to 250 but specific to live-tooling/milling spindle.

Confidence: medium · Detailed causes/remedies but only one accessible source.

First sourced: 5/21/2026

Related alarms

Same control or a nearby code on the same machine.