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 Posted - June 26 2011 : 09:59:56 AM
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the motor shown below came out of a old but mint pa-1,so at first thought it needed breaking in,but soon became obvious it was binding due to overheating,brushes as new,as is coil,flywheels rotate smoothly,?ken
Edited by - catfordken on June 26 2011 10:00:31 AM
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Posted - June 26 2011 : 1:41:22 PM
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are the flywheels pressed on to far rubbing the case making a little resistance? have you oiled the bearings?
jerry
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Posted - June 26 2011 : 1:53:16 PM
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| all done,flywheels are not touching,spins freely,ken
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Posted - June 26 2011 : 5:24:44 PM
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try taking it all the way apart & reassembling it. it might be dirty or something? if that don't fix it, take off the flywheels & remove the brushes & brush springs & beat the shat out of it with a BMFH.
do you think the windings might be bad causing it?
jerry
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Posted - June 26 2011 : 5:30:35 PM
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hi smokie,seems like that might be the way ken
Edited by - catfordken on June 26 2011 5:42:41 PM
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Posted - June 26 2011 : 11:17:10 PM
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it looks good don't it, looks clean. do the brushes slide in & out on their on weight?
jerry
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Posted - June 27 2011 : 08:21:02 AM
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I addition to what Jerry mentioned about the capability of the brushes to slide easily up and down in their holes; I have found that a possible problem area is the point where the brush spring touches both the brush and the metal contact strip. Very carefully clean up the ends of the brush spring with sandpaper or something suitable. Also shine up the bottom of the contact strip where the spring touches. Sometimes I have found that the spring ends look blackened; like they have been way too hot.
Something else, maybe already mentioned, is to take a small screwdriver and clean out the slots between the places where the poles are on the commutator. Graphite crud, which is conductive, can build up in there and cause basically a partial short between the windings. I have had good luck with running the motor and dropping laquer thinner down into the brush commutator area. All kinds of junk will run out; usually with an immediate increase in speed.
Something else that can be done is to pull the brushes completely out of the motor and reshape them to ride nicer on the commutator. A small roound file is what I use.
One last thing to look for is to see if any of the winding wires have been broken off from where they solder to the commutator poles. I have had good luck in these cases; pulling enough wire by unwrapping one winding and then re-soldering to the pole.
Randy
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