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  1. #1
    Join Date
    Jul 2010
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    Brisbane
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    102

    Default cleaning windings

    Looking to get an old 1/2 HP motor back in service.. windings are covered in wood dust and oil... what i can see of the windings look OK except for a small patch that has lost its varnish.
    the front bush is shot so it will need replacing... are these available ?
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  2. #2
    BobL is online now Member: Blue and white apron brigade
    Join Date
    Feb 2006
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    Perth
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    5,586

    Default

    Quote Originally Posted by kenny_10 View Post
    Looking to get an old 1/2 HP motor back in service.. windings are covered in wood dust and oil... what i can see of the windings look OK except for a small patch that has lost its varnish.
    If the patch have really has lost their varnish the motor should not be used.
    If you are referring to the shiny copper windings in that photo they look like they are OK and have not lost their varnish (they were probably covered with something that stopped them getting dirty.

    ************ the following is provided at your own risk ***********************

    The right way to check this out is to use a compressor to blow out the loose crap and then use a Megger Tester to check the insulation resistance of the windings.
    A paint brush or well used soft toothbrush can be used to loosen the dust.

    If you have no Megger at least test the winding insulation using an Ohm meter. The test should be between either ends of the coils to earth. This should be at least 2 MΩ

  3. #3
    Join Date
    Dec 2018
    Location
    NSW
    Posts
    247

    Default

    CRC lectra-clean

  4. #4
    Join Date
    Jun 2016
    Location
    Batemans Bay
    Posts
    60

    Default

    When I was an apprentice, I was taught to never use compressed air on motor windings. The reasoning was that stuff that could otherwise be removed by hand/brush/vacuum, could easily be forced down into somewhere that it can't be removed from, which could damage the insulation. Secondly, the force of the compressed air itself can physically damage the windings and insulation if it's applied incorrectly.

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