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Magnetic Drill Vise

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  • Bob Engelhardt
    replied
    I can also point out that it depends upon the material thickness, a lot. A piece of 3/4" thick bar will be held much, much better than a piece of 16 ga sheet.

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  • Dunc
    replied
    Hmmm... going to rethink this. The drill press vise I already have certainly clamps well enough.

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  • Bob Engelhardt
    replied
    There was a long discussion of MOTs as electromagnets in the "Should I use pot" thread:
    https://bbs.homeshopmachinist.net/fo...ould-i-use-pot

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  • Bob Engelhardt
    replied
    Originally posted by danlb View Post
    ...In short, great for tension, not so great for shear. ...
    Yes - magnets are not very good at shear. So, not very good at holding the work while drilling, but good for holding the drill. 'Cause the magnet is offset from the bit/torque by 6" or so. I.e., at the end of a lever.
    Last edited by Bob Engelhardt; 01-07-2021, 08:20 PM.

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  • Doozer
    replied
    Mag drills work perfectly.

    -D

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  • danlb
    replied
    Your post brought to mind that many magnets have more holding power in a vertical direction than they do to horizontal motion. In short, great for tension, not so great for shear. Since drilling is an action that causes the work to spin if the drill jams, would a mag chuck have trouble holding the work?

    Dan

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  • Dunc
    started a topic Magnetic Drill Vise

    Magnetic Drill Vise

    I have a few microwave transformers looking for a job. There are many build it articles on the web (for eg, https://www.youtube.com/watch?v=jSxOtDPh9Ew&t=333s) that are based upon them. More recent microwaves seem to be using smaller transformers (switching power supplies instead of "brute force" using 60 Hz?). While the videos give the basics, in general, to achieve maximum magnetism how important is transformer iron mass (are bigger transformers better)? Should multiple transformers be identical? How should they be wired (series, parallel or...)? Should the transformer(s) be tightly packed inside the case? Does the material thickness (mild steel) of the Base & walls matter - does thicker increase magnetic force? Would a cover (mild steel plate) increase/decrease/have no effect on the magnetic strength? Builders seem to favor DC. While AC (120 volt) might be acceptable I don't want to go where I know nothing.
    How many pounds pull makes an acceptable vise? How could I measure it or is "management by result" suitable?
    Any other thoughts appreciated. Thanks!
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