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Author Topic: DC07 Motor Sparking  (Read 5106 times)

Offline macman

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DC07 Motor Sparking
« on: August 16, 2012, 11:21:45 AM »
What level of sparking is acceptable from a YDK motor? I acquired a DC07 recently with an apparently blown motor. I fitted a new after-market motor, but then decided to inspect the old one a bit more closely. It was dead, but powered up OK once new brushes were fitted (the old ones were badly worn down) and the commutator cleaned-it wasn't badly scored. However, there is some 'localised' sparking between brushes and comm visible when bench testing it. Other than that it seems to run OK. Is this acceptable/normal, or is it likely to fail again fairly quickly?
There seem to be two schools of thought as to whether brush changes are worthwhile.

Online __russ__

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Re: DC07 Motor Sparking
« Reply #1 on: August 16, 2012, 12:39:54 PM »
What level of sparking is acceptable from a YDK motor? I acquired a DC07 recently with an apparently blown motor. I fitted a new after-market motor, but then decided to inspect the old one a bit more closely. It was dead, but powered up OK once new brushes were fitted (the old ones were badly worn down) and the commutator cleaned-it wasn't badly scored. However, there is some 'localised' sparking between brushes and comm visible when bench testing it. Other than that it seems to run OK. Is this acceptable/normal, or is it likely to fail again fairly quickly?
There seem to be two schools of thought as to whether brush changes are worthwhile.

If the sparking is continuous after switch on then I would say the motor is only good for the bin I'm afraid. There should be a small amount of sparks initially after powering on, but if it's a healthy motor these should die down to virtually nothing straight away.

If the motor is already sparking then changing the brushes is a bit like closing the gate after the horse has bolted IMO - if however you have a good motor and the brushes are getting a bit on the low side, then it's prudent to replace the brushes as it will extend the motor's life.


Offline Angus Black

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Re: DC07 Motor Sparking
« Reply #2 on: August 17, 2012, 01:37:48 AM »
What level of sparking is acceptable from a YDK motor? I acquired a DC07 recently with an apparently blown motor. I fitted a new after-market motor, but then decided to inspect the old one a bit more closely. It was dead, but powered up OK once new brushes were fitted (the old ones were badly worn down) and the commutator cleaned-it wasn't badly scored. However, there is some 'localised' sparking between brushes and comm visible when bench testing it. Other than that it seems to run OK. Is this acceptable/normal, or is it likely to fail again fairly quickly?
There seem to be two schools of thought as to whether brush changes are worthwhile.

If the sparking is continuous after switch on then I would say the motor is only good for the bin I'm afraid. There should be a small amount of sparks initially after powering on, but if it's a healthy motor these should die down to virtually nothing straight away.

If the motor is already sparking then changing the brushes is a bit like closing the gate after the horse has bolted IMO - if however you have a good motor and the brushes are getting a bit on the low side, then it's prudent to replace the brushes as it will extend the motor's life.

What he said

I never bother changing brushes any more for this reason.

Offline bluebumble485

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Re: DC07 Motor Sparking
« Reply #3 on: August 17, 2012, 08:14:10 PM »
i agree waste of time and money
just change the motor they are cheap enough

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