[Jewelry making - Article 00092] - Re: [Orchid] Inside ring abrasives

[John Donivan]

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>     There are many different abrasive materials available and I've
>     read the catalogue descriptions. I still don't understand what the
>     real differences between them are,

    Joasona - another question that has as many answers as people... We
    use the wooden mandrels that go on a tapered spindle and take 1/3
    sheet of sandpaper, or in our case almost always emery paper. Since I
    couldn't find any new ones that had straight shafts, as the tapered
    shafts cause the sandpaper to come off, I made a few on the lathe out
    of aluminum rod. They have a split down the shaft to hold sandpaper,
    and are about 4" long. Use a rubber band to hold the sandpaper on. We
    use them to sand the inside AND the outsides of rings. It's cheap -
    uses any regular sandpaper - and has a large surface area. As for
    abrasives, we use emery paper exclusively, as does most of the
    industry. Emery is naturally occuring aluminum oxide, of course.
    Carborundum is much too aggressive, though we'll use it for some
    other project - wood, steel, whatever, at times. Large (like 6")
    Cratex wheels work really good on the outsides of rings, but I never
    liked the inside ring sticks they make, and they suffer from the
    grooving issues that grinding wheels can have..... We don't sand
    rings with a flex shaft except for detailing - life is too short.

http://www.donivanandmaggiora.com
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