If you wanted to make a magnetic back cover-plate...

Discussion in 'Luthiery, Modifications & Customizations' started by Bearitone, May 6, 2020.

  1. Bearitone

    Bearitone SS.org Regular

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    How would you go about it?
    What do you think would be the cleanest method?

    Right now I am thinking drill out holes in the body and press in dowel pins. That solves one have of the equation. But, I don't know how I would go about adding magnets to the cover plate.

    Or visa-versa. If I press-fit magnets into the body, I don't know how to get metal discs onto/into the back cover where the original screw holes were.

    The solution is probably obvious but, right now I cannot see it.
     
  2. KR250

    KR250 Build addict

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    Fairly thick cover plate, I go for about .22" - .25". Drill for magnets on both cover plate and body cavities. Do the body first, then use magnets as locators for the cover plate to drill. Use some super glue or epoxy to hold them in. Make sure to get the orientation right.

    Here's a few I've done. One thing I'll do differently next time is to have a taller lip for the magnets on the body side to sit on, so that you can tilt the cover plate to open it vs the access points I've done here. But these work quite well too.
    upload_2020-5-5_21-55-34.png

    upload_2020-5-5_21-56-43.png

    Same theory here, and not I didn't do the Evertune cover plate since I need a full 1.75" for the bridge system route.
    upload_2020-5-5_21-58-55.png

    upload_2020-5-5_21-59-34.png
     
  3. Samark

    Samark SS.org Regular

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    That neck's gorgeous :frantic:
     
    Walter W. and KR250 like this.
  4. Xk6m6m5X

    Xk6m6m5X SS.org Regular

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    I tried to mod my arz for a magnetic cover because i put a battery in the cavity....you need wood covers....ive tried every type of glue or epoxy imaginable and i cant get the magnets to stick with any reliability to the plastic.
     
  5. foreright

    foreright SS.org Regular

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    That would depend on the plastic - I’ve used acrylic for mine in the past and regular superglue will bond magnets to it just fine. If it’s some kind of polypropylene or similar then yes you need more specialist (ie. it says it will stick that specific plastic on the label!) glue.

    Wood does look nicer though :)
     
  6. spudmunkey

    spudmunkey SS.org Regular

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    You may not actually need to install magnets on the cover itself. You just need something magnetic, not necessarily a magnet.

    If your cover is recessed, and you don't need to depend on magnet locations for alignment or magnet-to-magnet strength* to help keep it from sliding, you can just adhere a sheet of magnetic metal to the back of the cover. It doesn't take much. Magnetic dry-erase boards have a pretty thin layer of metal behind the markerboard material...barely more than a foil. Get a thin sheet of sheet metal, and adhere *that* to the underside of the plate. The increased surface area where there isn't a magnet will give you more acreage for adhesive, too.

    For a recessed cover, the magnetic hold doesn't actually need to be very strong at all. Unless your cover is super heavy, even very very lght-duty magnets will hold a cover in place, maybe even through a severe/sudden hit to the body, like a drop.

    *actually...are two attracted magnets actually stronger than magnet-to-metal? Or is it something like the "two 50mph cars in a head-on collision is not like a 100mph creach into a wall, but the same damage as a 50mph crash into a wall, becuase both behicles deform" thing?
     

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