[Jewelry making - Article 00161] - Re: [Orchid] Realistic rocks drilling

[Jeanette Baugh]

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>     Is it realistic to think a half inch to one inch deep hole could
>     be drilled into a stone? (probably granite). 

    This is how I've drilled holes in different rocks althoush I have not
    drilled a hole that large or deep. I would imagine you would use a
    larger bit. Use a blunt drill bit with diamond grit bonded to the tip
    in a rotary tool with an adjustable speed control will work. Do not
    use a three-jaw chuck to hold the drill bits. Use collets sized to
    fit the drill bit. Place rock in water to cover for cooling so you
    are drilling under water. Start with your slowest speed and adjust up
    until you burn up a bit. Now you have found the maximum speed for
    cutting that stone. Start your holes with the blunt end held at about
    a 45-degree angle to the surface. Once the hole is started, you can
    drill 90-degree straight down. Slowly rotate the drill around in a
    circle. Continue this circular motion until the hole is finished.
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