[Jewelry making - Article 00107] - Re: [Orchid] hammer handpiecs

[David D. Arens]

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Hi Gang,

>       I had the same over heating with my hammer until I put it on a
>     foredom motor with a 3:1 reduction gear. The increased torque and
>     the decreased RPM seem to help the problem.

    Frank's made a very important point. If you read the instructions
    that came with your hammer handpiece, you'll probably find the
    something like the following. 'DO NOT operate this tool at more than
    5,000 rpm!'. 

    The flex shaft motors  with the gear reduction slow the output down
    to this range. Most flex motors will run up to about 15,000 - 20,000
    rpm. Unless you've got a very educated toe & an experienced ear, it's
    very difficult to hold the race horse ouput down to draught horse
    speed. Dave 

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