Hello all,

bear with me, I am new to CNC. Our shop has a Kuraki KBT 1105DX with Fanuc 6MB controls. We are having an issue where the the spindle will abruptly stop while cutting, but the feeding will continue. Obviously, this will tend to break things.

There are no alarms shown on the control screen. Operator says that the speed is otherwise well-controlled. I would have expected that if the controls saw the speed drop out, it would set an alarm and stop the feed, but maybe I'm being too optimistic.

Edited to Add: this is a DC spindle motor. I'm not sure what version of the spindle controller I'm working with, I haven't had a chance to open the cabinet yet.

Are there any obvious things I should troubleshoot first?

Any help would be appreciated.

Regards,

Ryan