Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default circular saw problem?

Hi.

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.


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Default circular saw problem?

"Stephen" wrote in
o.uk:

Hi.

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.




I had a similar problem with my Makita 6095 drill/driver. (blue sparking)
I used CRC MAF-sensor spray cleaner to wash out the powdered graphite on
the commutator tht was left over from the worn brushes. No more sparking.

yellow sparking would seem to indicate some sort of ferrous metal burning.
maybe it needs lube,if the bearings aren't too far gone.

--
Jim Yanik
jyanik
at
localnet
dot com
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Default circular saw problem?

Jim Yanik wrote in message
4...
"Stephen" wrote in
o.uk:

Hi.

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.




I had a similar problem with my Makita 6095 drill/driver. (blue sparking)
I used CRC MAF-sensor spray cleaner to wash out the powdered graphite on
the commutator tht was left over from the worn brushes. No more sparking.

yellow sparking would seem to indicate some sort of ferrous metal burning.
maybe it needs lube,if the bearings aren't too far gone.

--
Jim Yanik
jyanik
at
localnet
dot com



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


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Default circular saw problem?

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.


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Default circular saw problem?

Stephen wrote in message
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.




So a fault leading to more current than the brushes are designed for and/or
rough/broken/accreted commutator lands




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Default circular saw problem?

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.

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Default circular saw problem?

"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
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