[Jewelry making - Article 00100] - Re: [Orchid] Techno X handpiece problems

[Peter W . Rowe]

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>         if I remeber right there is a screw at the bottom of the
>     collet on that handpiece that adjusts the collet tension. these
>     handpieces do wear qute a bit, as most( not all) jewelers try to
>     open the collet with the burr still moving, wears em out real fast.
>     last time we had one repaired it was between 50 and 90 bucks not
>     counting shipping both ways. a few years back there was only a few
>     poepe that worked on he techno X.  hoefully you will have better
>     luck getting it serviced 

    Opening and closing the collet on the techno while it's still
    rotating shouldn't hurt anything internally,  since it doesn't cause
    anything to generate friction. The cam that opens the collet is
    bearing on two outer, non-rotating housings of ball bearings, and
    it's made that way specifically to avoid wear and tear on the cam. 
    The Faro type handpieces, on the other hand,  and a couple other
    types too, wear out the cam quickly when opened while running.  Now,
    if when you open the collet on a techno, so the bur is loose, you
    then grab the bur and hold it still while the machine still runs on,
    that will do a bit of grinding on the inside of the collet,
    especially with high speed burs that don't have super smooth shanks. 
    But my normal practice, at least, would be to grab the bur and remove
    it, not leave it grinding on the collet.  There's little, if any,
    friction on the collet when doing this, i believe.  the collet, of
    course, does not move/bear against the taper of the shaft in any
    rotational way.  it's the same in/out motion whether the shaft is
    running or not. 

Peter

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