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removing drive screws from aluminum

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  • removing drive screws from aluminum

    A friend brought over an aluminum casting from an old british bike the other day and asked if I could remove 3, 3/32"(ish) steel drive screw shanks from it. I know how hard those things are and being small they will be very hard to center up.

    I'd heard about some sort of acid that will eat the steel, but not the aluminum.

    Any suggestions???

    Thanks
    Pete

  • #2
    I have removed screws that size from aluminum or other non-ferrous material by welding a nut to them. I described the process in the March/April issue of HSM.

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    • #3
      Put the works in an anodising bath and it will eat the steel out in a couple of hours.
      Free software for calculating bolt circles and similar: Click Here

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      • #4
        Alum will also dissolve the steel to the point that it can be removed.
        It is usually available in the supermarket with canning supplies. Make a concetrated solution and soak parts in it. You may have to make a dam of modeling clay to hold. It helps to heat.
        Jim H.

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