[Jewelry making - Article 01237] - Re: [Orchid] High speed spindle

[Harry Hamill]

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Todd,

    Running your spindle at 20K will produce wax dust instead of cutting
    a clean chip, the kinetic energy involved with recutting the chips
    into dust will slightly melt it and make it pack it into crevices
    and can remelt it on the surface. "Melting" is a misleading term,
    it's not like it melts into a blob, it just tends to slightly stick
    to the surface. I use coolant, which helps by removing the chips and
    prevents remelting. 

    So, 20K will not give you a better finish than 11K, you could run a
    slightly higher feed rate if your mills up to it, but that won't get
    you a better finish either, just done faster. Chip load is low in
    wax, you'll break tips by too high a feedrate, not so much too low a
    spidle speed. A superior surface finish is the combination of many
    things, a rigid, accurate mill, an accurate spindle, cleanly ground
    cutters and the proper feed and speeds. Fixing one doesn't
    necessarily fix the others. 

    Changing speeds is obviously easier with an electronic control than
    pulleys, the other advantage is it's a lot more accurate. I'm always
    suspicious of the speeds rated by the manufacturer for pulley
    systems, I think they're a little optimistic. It's worth doing the
    math and figuring it out for real.
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