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  1. #11
    Donald Qualls's Avatar
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    Quote Originally Posted by MattCarey
    Interesting--I kept thinking in my mind "corundum", which is the structure of sapphire.

    I would bet that the guys who trademarked "Carborundum" had the similarity in mind.

    Matt
    That was exactly the intent -- it was marketed originally as a synthetic subsitute for aluminum oxide, which is corundum. It's similar in hardness and cuts faster because the more jagged grains spall out chunks of the work as they roll during (optical) grinding, or cut larger chips for a given grit size in applications like grinding wheels and sandpaper.
    Photography has always fascinated me -- as a child, simply for the magic of capturing an image onto glossy paper with a little box, but as an adult because of the unique juxtaposition of science and art -- the physics of optics, the mechanics of the camera, the chemistry of film and developer, alongside the art in seeing, composing, exposing, processing and printing.

  2. #12

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    Oct 2004
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    http://www.kingsleynorth.com/

    I've ordered from this place, they are GREAT. Had it in about 2 days.
    Cheap. They also have silicon carbide and aluminum oxide. In MANY grades.
    Many types of grinding and polishing compounds. Cool stuff, my father used to make jewelry and he seemed to like the catalog too.

    Locally I was able to get a medium grit valve grinding paste. Too rough but good to start out with. If you start with a coarse grit and finish with a fine grit I think it makes a large difference.

    PS- I forget what size grit I used for my ground glass but man, I was happy with what I was able to make for my 4x5. BRIGHT! And I made about 2 dozen pieces in two hours. Use a wetstone for grinding down the edges of the glass as well.

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