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soldering brushes in starter motor

Discussion in 'XJ Technical Chat' started by bensalf, Feb 12, 2018.

  1. bensalf

    bensalf Active Member

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    hi all
    I am refurbishing a spare starter motor I have , I got some new replacement carbon brushes, but my soldering iron was not powerfull enough to melt the solder whilst touching the backplate , so I used a small blowlamp, but then the solder "wicked" up the flexible brush copper braiding, making them stiff and useless, I've sent for some new brushes, but how can I solder just the end of the copper braiding without the solder wicking up it
    thanks for any help
    stu
     
  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    clamp the braid off with hemostats or soldering heatsink or buy brushes with the braid attached
     
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  3. XJ550H

    XJ550H Well-Known Member Premium Member

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  4. bensalf

    bensalf Active Member

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    ok thanks ,yes I have some haemostats. i'll try them
    the brushes already have the braiding attached , its the other end i'm trying to solder to the backplate.


    [​IMG]
    thanks
    stu
     
  5. Polock

    Polock Well-Known Member

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    tin the backplate and braid first. if you make a line with soapstone, solder won't cross it. so draw a box around where the braid goes on the backplate, snip a piece of solder, put it in the box and melt it with your torch, when your happy with that, do the braid with your hemos. then attach them with your iorn.
    flux, flux, flux....
     
  6. bensalf

    bensalf Active Member

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    tin the backplate and braid first. if you make a line with soapstone, solder won't cross it.
    -----------------------------------------------------------------------------------------------------------------------
    ahhh. very interesting, it was tinning the braid when it wicked all the way up.
    soapstone, i'll look it up.
    thanks
    stu
     
  7. XJ550H

    XJ550H Well-Known Member Premium Member

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    heat the end of the braid the solder will flow to the heat
     
  8. Polock

    Polock Well-Known Member

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    soapstone, welding supply or sewing shop
     
  9. bensalf

    bensalf Active Member

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    well, finally got the job done, (found engineers marking chalk is soapstone, doh) also used haemostats to clamp off the braid, heated the backplate, then did a quick touch with the braid and soldering iron, and it "took". also did the other brush onto the terminal post.all now ok thanks, although I did destroy one other new brush, due to wicking with the torch.
    thanks all
     
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