[Jewelry making - Article 00718] - Re: [Orchid] ER16 spindle accuracy

[patpruitt]

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    The ER series of collets will keep the tool concentric with the
    spindle. If your already using a drawbar/collet style tool holder
    (couldnt find the info on Taigs site), then I dont think youll see
    much of an improvement considering the runout of the non ER spindle
    is 0.0004" and the ER spindle is 0.0003". In addition, with small
    machines, running the RPM's up that high could introduce more
    vibration to the machine since the drive motor sits off the side of
    the head like that. 

    If your experiencing inaccuracies in your work, I would first check
    the runout on the spindle with a *tenths* dial indicator. If that is
    good, check the backlash and also see if there is any play in the
    gibs/ways, they might need tightening/adjustment if the machine has
    been used a bunch. 

    The only advantage of ER series of collets, like you mentioned, is
    the ability to hold a variety of different diameter of tools, and
    keeping things concentric. 

Good Luck,
P AT 
www.patpruitt.com
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