CNC router: Spindle not turning on / intermittent

General CNC CNC Routers
1

Hola amigos -

Booting up the CNC router, and when trying to activate the spindle (using g-code ‘m3 s1000’), (1) the spindle intermittently starts and stops - and I notice a small white spark from within the motor (2) it’s not turning on at all

See this video, where you can hear the motor audio:

(time: 5:30-6:30ish)

PS: First time using OBS to stream live to PeerTube / Makertube.net.

I have attempted: Re-connecting all spindle-related cables, power cycled the router & UGS.

Any ideas / suggestions? Planning to have a workshop tomorrow with some kids, where they will draw/design and we’ll etch it into wood.

// JRO

2

I think that is the end of the motor. It has the symptoms of both shorted and disconnected windings. When there are sparks on the brushes, it is often a sign that there are shorted windings and a motor not starting indicates that the brushes are connected to broken windings. Turn the motor a bit further or back and it starts again.
If you don’t want to disappoint the kids you might have to get yourself another router.