Makita saw sparking

[festive]

My old Makita saw is sparking when you power it up to cut. I removed the carbon brushes they seem ok. But lots of sparking when I spin it up is it the commutator or? Also note it only one side the rear or right hand brush as you can see isn't sparking at all.

 

[ETAF]

a lot of videos where brushes look OK - but need changing - not sure on Makita , but quite a few on festool that stop working brushes look fine - and not that much smaller and then new brushes fixed
Peter Millard and

 

[festive]

And another pic of commutator

 

[ericmark]

Likely a problem with windings, but not seen a growler in years, so not sure how you would test today.

 

[festive]

Likely a problem with windings, but not seen a growler in years, so not sure how you would test today.

I guess your definition of a growler is different to mine

 

[Harry Bloomfield]

I guess your definition of a growler is different to mine

No, a pork pie will not help.

 

[Harry Bloomfield]

Shorted turns on the armature seems likely. Nothing much you can do, other that buy a new one, but likely to cost as much as a new machine.