Removing 4mm thick brake plates from magnetic chuck of a ring grinder
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  1. #1
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    Default Removing 4mm thick brake plates from magnetic chuck of a ring grinder

    Hi
    I have a ring grinder and after grinding the 4 mm thick plates I cannot get the electro magnetic chuck to release the part.
    The thinner plates vary in size from around 400mm x ID 200mm up to 650mm x ID 550.
    Even if I turn the machine off and leave them overnight they still not come off.
    I have no problem with removing larger heavier parts, just reverse the polarity for a couple seconds while hanging onto the part and off it comes.

    Any advice greatly appreciated

    Best Regards
    Burgs

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    Lay a piece of clean, dry, unused paper between your ring and the magnetic chuck. Copy or tablet paper will do fine. The ring will be parallel within a couple of tenths if the paper is not wrinkled.
    Gene

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    use your air gun and blow at the edge of the part. This may help to release it.

    I assume normally your magnet releases parts just fine? but these are coming very flay and "wringing" to the chuck?

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    I have set-on plates and parallels with serrations so I can grind them for a very fussy job so not needing to grind the chuck. Perhaps such plates could be made so one might put a wedge under the part / or that they could not ring the chuck. Agree one does loose some hold doing this.

    The serrations allow grinding with less worry about stress and heat when a tickle grind is made to them, perhaps .0005 to .003 take.

    Yes I made them for working at the big shop where I might have to set work on a questionable grinder chuck.

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    Hi
    Thanks for the reply's, paper workedI used my wife's cooking paper 0.06mm Thick, tried A3 paper but coolant destroyed it.

    Just need to place a bit of 4 X 2 wood, on the inside of the plate, pull hard against it, reverse the polarity, and turn it off and I can slide the plate from there, only need a about 50mm movement then I can pick the plate up with an indicator magnet.
    Good thing is the paper also stops the plates from scratching.
    Normally I grind bigger heavier cast iron housings and pistons, these release fairly easily, just need to have a hand on and pull them when reversing the polarity, and off they come.

    Now I have a bigger problem, couldn't get a decent finish, and noticed the spindle was a bit noisy so stripped down and checked the spindle bearings, one of the four felt rough, so have stripped down ready for new spindle bearings, looks like $450 au each, ouch.

    Best Regards
    Burgs

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    What make of ring grinder do you have ?

    Regards Tyrone.


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