[Jewelry making - Article 00411] - Re: [Orchid] Flexshaft vibrating in the shaft itself

[Karen Christians]

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All,

    An important tip here for loading any accessory into a #30 Jacobs
    chuck. 

    1)  You will notice that the chuck has three discrete indentations. 

    2)  When you load in a flex shaft accessory, make sure that you
    engage the chuck key into each one, tightening and rotating,
    tightening and rotating, until all three have been accessed in this
    manner. 

    3)  Why?  If you move from a very tiny accessory, such as a small
    drill bit and then to a larger width bur, if you only continue to
    load and tighten with one indentation with the chuck key, eventually,
    the rotation of the Jacobs chuck could spin off center. 

    4)  By tightening all three, you insure that you have equal pressure
    bearing down on the accessory at all times thereby extending the life
    of your handpiece and creating a very tight fit. 

    There is no need for this when you use a quick change hand piece of
    course, only ones that contain a Jacobs chuck (the three pointy parts
    of the handpiece).  However, one thing to note about quick change. 
    After a time, mandrels which load a Moors abrasive disk or a 3M
    Radial Bristle disk will work harden and wear down and the handpiece
    jaws can loose their grip. Especially important for the minute size
    tolerance of the actuating jaw and the mandrel. 

    My friend has a Swiss Techno X handpiece and was yelling that now
    she had to purchase a third one, because the mandrels were slipping
    in the jaw assembly.  I looked at the mandrel and realized that the
    shaft had worn down.  I found a newer mandrel and swapped it for the
    one she was using. She exclaimed happily, "you fixed my handpiece!" 
    No, just swapped the mandrel. 

    Sometimes it's just the $.05 part and not the $145 one.  LOL 

Karen Christians
Cleverwerx
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