"Stephen" wrote in
o.uk:

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?

Stephen.


Or shorts to the iron of rotor or stator which explains the original
and replacement brushes, blue sparks from excess rotor current

The tale deepens....

as mentioned before I had recently replaced the brushes. This was
after serious use involving fitting a kitchen, bathroom, garden fence,
chopping up old fencing and old wood windows for fire wood etc etc.

I have not had as much use on the second brushes. Today I have
inspected them One is half worn and the other is completely worn down
to the springs.....

Stephen.




sounds like your commutator is damaged and is abrading the brushes too
quickly. often,commutators are turned smooth before replacing the brushes.

--
Jim Yanik
jyanik
at
localnet
dot com