[Jewelry making - Article 00408] - Re: [Orchid] Drill press - drills don't clamp in exactly straight

[Jeff Simkins]

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    A master machinist once told me that I should wiggle the drill bit
    while closing the chuck. I thought he was crazy until I managed to
    clamp a bit with only two of the three jaws to make for a very wobbly
    drill. 

    TIR, a specification that you will find on the very best of drill
    presses. It is the run out of the spindle. A smaller TIR will mean
    less wobble in the spindle. You will notice this when you drill with
    a bit that is 0.010" but not so much with one that is 0.250". 

    A center punch has helped me hold down a wobbly drill bit when using
    drill presses with bad spindles (a.k.a. the paperweight). It puts a
    ding in the work piece. 

Jeff Simkins
Cincinnati, OH

 
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