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Thread: DIY Demagnetising tool that works

  1. #11
    Supporting Member tonyfoale's Avatar
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    Mark,
    Worthy winner.
    I copied it and have now retired my transformer based device. Actually I want the transformer for another tool.

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  3. #12
    Supporting Member Mark Presling's Avatar
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    Tony,
    I am glad it worked for you. Mine gets a regular workout. For some reason my shed seems to have a magnetic charge. I have heard that a nearby lightning strike can magnetise large structures. We get lots of thunderstorms where we live and we had a very close strike a few years ago that killed the quartz clock mechanism in our kitchen!
    Regards,
    Mark Presling

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    freddo4 (May 17, 2022)

  5. #13
    Supporting Member Beserkleyboy's Avatar
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    Congrats, Mark! Just btw, where are you that you get the lightning? Cheers
    Jim on a beautiful early winter's day (23C) in South Coast AUS

  6. #14
    Supporting Member tonyfoale's Avatar
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    Quote Originally Posted by Mark Presling View Post
    Tony,
    I am glad it worked for you. Mine gets a regular workout. For some reason my shed seems to have a magnetic charge. I have heard that a nearby lightning strike can magnetise large structures. We get lots of thunderstorms where we live and we had a very close strike a few years ago that killed the quartz clock mechanism in our kitchen!
    Regards,
    Mark Presling
    Lightening can be destructive. A couple of years ago it destroyed the controller in a pellet fire heater as well as some UPS and other things. I made a new controller for the fire from an Arduino which works better than the original.
    I use a some magnetic bars as tool holders and that is one reason that I sometimes need to demagnetise. When I saw your idea I knew that it would work but I was uncertain as to whether it would work well enough. It has proven itself on calipers, drill bits (I don't know how or why they get magnetised) and most screw drivers but I have one screw driver that refuses to be demagnetised. I wonder whether it is intended to be magnetised and perhaps has a magnet hidden in the handle. It is not strongly magnetised but it just will not give up what it has.

  7. #15
    Supporting Member mklotz's Avatar
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    Miniature mechanical demagnetizer

    For bigger tools, I demagnetize with a bulk tape eraser (remember those?). For smaller tools I use my old Weller soldering gun.

    However, when I saw Mark Presling's ingenious mechanical demagnetizer...

    DIY Demagnetising tool that works

    I had to have a miniature version for my in-house small job bench. Beyond its undeniable coolness, it would save me the trip to the garage to retrIeve the soldering gun and could be spun with any of the Dremel/Foredom-like tools lying on the bench.

    I was fortunate to have some 1" fender washers with a 1/8" hole that just fits a 5-40 screw to provide a shaft to grasp in the Dremel. Six Harbor Freight 5/16" diameter super magnets were epoxied to the washer in an alternating polarity configuration.

    Spun at even a low speed, it does a fine job of demagnetizing small tools.

    DIY Demagnetising tool that works-p1010349.jpg
    ---
    Regards, Marv


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    http://www.myvirtualnetwork.com/mklotz

  8. The Following 7 Users Say Thank You to mklotz For This Useful Post:

    DIYer (May 19, 2022), freddo4 (May 17, 2022), Jon (May 19, 2022), mwmkravchenko (May 16, 2022), rebuilder1954 (May 21, 2022), rlm98253 (May 16, 2022), techcollect (May 17, 2022)

  9. #16
    Supporting Member tonyfoale's Avatar
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    It is now 3 years since I made my version inspired by Mark's. I made a stand alone version with the rotor driven by an old washing machine pump motor. The motor and switch are encased in a plastic junction box and sit on a bench permanently. It gets used regularly. I am still at a loss to understand how calipers get magnetised but they do, although not often.

  10. The Following 4 Users Say Thank You to tonyfoale For This Useful Post:

    DIYer (May 19, 2022), mwmkravchenko (May 16, 2022), rlm98253 (May 16, 2022), uv8452 (May 22, 2022)

  11. #17
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    Thanks mklotz! We've added your Mechanical Demagnetizer to our Miscellaneous category,
    as well as to your builder page: mklotz's Homemade Tools. Your receipt:






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