On Oct 27, 2:47*am, "Stephen" wrote:
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.

Doesn't a 'shorted' turn on a motor burn out brushes?

Usually accompanied by loss of torque.