Dremel 300 - need some repair advice

[VectorGlow]

I have a Dremel 300, one of these:

http://images.dremeleurope.com/gb/en/ocs/image/ocsjpg--/dremel%C2%AE300series-9657.jpg

I've had it for a few years and use it occasionally.

This afternoon I used mine to grind down some plastic, it was working fine. I finished the job, went to use it again and it then wasn't spinning as fast as it should and sounded very "crunchy".

It then stopped spinning altogether and now just buzzes when I power it on and the motor gets rather hot.

The spindle turns okay if I spin it manually (in fact, when the fault first started I could get it to spin up by briefly spinning it manually, but that doesn't work any more). There's no sign of obstruction.

Brushes look fine, have taken it apart a few times and can find nothing obvious wrong. Bearings are fine too.

Any ideas please?

VectorGlow2016-01-13 18:29:24

 

[Brettster]

Was going to suggest brushes too but you checked those
Can you get the motor completely out? Check the stator , windings etc?

 

[VectorGlow]

Yup, completely too it apart, no obvious physical issues.

 

[ben76]

iirc drills and things like this have gears and clutches etc and it seems like its gone tits up round that area.... tbh for the price just get a silverline one instead imo

- Ben

 

[VectorGlow]

Can't see any gears or clutches in this one, just a speed switch and that's it really. Noted though, will look out for a cheap replacement.