[Jewelry making - Article 00647] - Re: [Orchid] Air powered handpiece

[Charles Friedman]

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    Direct metal sculpture with burs: 

    This is not exactly what I do as a dentist, but I can shed some
    light on this. When cutting off an old crown I usually want to create
    a slit in the gold or other metal running from cheek side over the
    biting surface and down the tongue side. Sometimes this represents
    the removal of a lot of metal. Usually I use a carbide tapered
    crosscut fissure bur such as a 701. If I try to take a deep bite or
    apply too much preasure, or the metal is very hard, I can get a lot
    of chatter. This does not feel good for the patient, and is not good
    for the handpiece bearings. This is done at 400,000 RPM with the
    light strokes with a lot of lubrication. I have seen people carve
    metal using flex shaft tools and large carbide cutters. I know that
    this does work. I carve occlusal surfaces to make them function
    properly, but usually the amount that I carve out is small (on the
    order of.010 inch at the most over a 1 mm size spot). Carving metal
    puts a huges strain on the high speed handpiece. In the flex shaft or
    the NSK it works better. 

Charles Friedman DDS
Again today blue sky 65 and no snow!
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