I got a Titan circular saw from Screwfix a couple of years ago.
The brushes had worn down to the springs about a year ago. I had contacted
Screwfix who then directed me to a spare parts supplier. I then bought a new
set of brushes. I have since installed these.
Ever since then I've always had a lot more blue sparking from the commutator
(visible through the ventilation vents). I put this down to the brushes
bedding in from a flat surface to a curved one.
Now tonight, whilst cutting pallets, I now have yellow sparks coming from
the other end of the motor.......
Is this something I should be concerned about? What is causing it? is it
repairable or shall I need a new circular saw?
Sparking from the brushes is common, but sparks from the other
end suggests either breakdown of insulation or that some from of
detritus has got in and is rubbing between moving parts and the
I personally would take it apart and have a look but being an
electronics engineer I know what I am doing. If you do not feel
comfortable doing such I would suggest scrapping it and buying
new - and at that buying a better made product such as Bosch,
Makita, Ryobi (which I believe is a subsidiary of Bosch,) even
B&D, but not an own brand.
I agree with Woody that your saw is dying, but I don't agree with the
timing of the replacement. Sure, it will need to be replaced, but you
might get a few more years out of the old one. Eventually it will
screech unbearably as the bearings turn to slag. You will drive the
neighbors crazy. But the blade will keep turning. When the blade won't
turn, that's the time to buy the new one, if your thrift muscle is as
well developed as mine.
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