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IndustryArena Forum > General Maintenance > Maintenance DIY Discussion > Trimming motor brushes - how practical is this?
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  1. #1
    Junior Member
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    Aug 2012
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    Trimming motor brushes - how practical is this?

    Have a bush motor that brushes are used up and can't find exact replacements. They are 7 x 8 x about 20 mm with a braid out the side. Have found some similar and slightly larger. Wondering how easy it would be to reduce the size, what sort of methods to use, how to clamp them without breaking, etc

  2. #2
    Member
    Join Date
    Jan 2005
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    11651

    Re: Trimming motor brushes - how practical is this?

    Quote Originally Posted by Jim27 View Post
    Have a bush motor that brushes are used up and can't find exact replacements. They are 7 x 8 x about 20 mm with a braid out the side. Have found some similar and slightly larger. Wondering how easy it would be to reduce the size, what sort of methods to use, how to clamp them without breaking, etc
    You can do this on a Bench grinder and then file them to square them up, just be careful with the wire ( braid ) not to damage it, they need to be a good fit in the brush holder so take you time in fitting them
    Mactec54

  3. #3
    Community Moderator Al_The_Man's Avatar
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    Dec 2003
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    23509

    Re: Trimming motor brushes - how practical is this?

    If not that much difference, what I do is use some medium emery paper and use hand strokes to carefully take it down evenly as possible, you do not want any slop if possible as it causes premature wear.
    If there is a fair difference, use coarse paper at first.
    Have a digital caliper handy to check fit.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

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