[Jewelry making - Article 00400] - Re: [Orchid] Drilling holes and gold loss

[Dave Arens]

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Hi Rahul,

>     But I am told that hand pieces generate more gold losses than the
>     traditional drills. Is that True? If yes, then why use the flex
>     shafts for drilling 

    I've never heard this sentiment expressed before, but if I had to
    guess why it may have been made it's this. 

    When using a hand drill, the drill is rotated at a rather slow speed
    (compared to the flexshaft). This results in the gold that's removed
    from the hole staying very close to the drill bit. In this position
    it's easy to recover & save for refining. 

    On the other hand, the drill bit turned by the flexshaft will
    probably be turning at a much higher rate of speed. This higher
    speed  will  probably cause the gold removed from the hole to  be 
    thrown  farther from the hole. This could make it harder to recover
    for refining. 

    However, if  the area used for drilling is set up correctly, the
    gold that's thrown from the drill will fall in a 'catch pan'  &
    while it's not around the hole or drill bit, it's not lost. 
    Drilling a hole with a manually operated or a powered drill will
    always leave a hole the same size if the same drill bit is used. 

Dave

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