[Jewelry making - Article 00467] - Re: [Orchid] Flexshaft vibrating in the shaft itself

[Peter W . Rowe]

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    Something else you can check. Sometimes, if the coupling of the inner
    shaft to the motor shaft is placed wrong, the tabbed end that couples
    to your handpiece can be either too far out of the sheath, or not
    extending out far enough. In one case, the handpiece puts the shaft
    into a compressed state, which not only isn't so good for the
    handpiece (can make some of them run hotter than usual, by loading
    the bearings more), but can make the inner shaft buckle a bit within
    the sheath as it runs, which can cause a vibration. If the tabbed
    end seems to extend farther from the sheath than it needs to in order
    to properly engage and drive the handpiece, check to see if it can
    mount further up on the motor shaft. 

    If the inner flex shaft is mounted too close to the motor, and not
    enough of the tabbed end engages the handpiece, then this too can
    make it not run smoothly, especially if the tab jams into the end of
    the handpiece without fully engaging the slotted coupling. The
    instructions that came with your flex shaft should describe the
    appropriate distance that the tabbed end should extend from the
    sheath, or you can simply judge it by eye from looking at the
    handpiece and seeing about how far it needs to extend. it's not a
    super critical measurement, but it does have to be in the right
    general area for the shaft to run smoothly. 

cheers
Peter
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