[Jewelry making - Article 01215] - Re: [Orchid] High speed spindle

[Dave Arens]

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Hi Andrew,

>     I've heard that those Proxxon spindles aren't suitable for long
>     duty cycles; they have a thermal cutout that will shut them off
>     when they get hot (which may not be when the part is done). 

    I conducted a little test with my Proxxon IBE. 

    Since I didn't have anything to mill, I placed a slip mandrel in the
    collect with strip of 3/4" (20 mm) wide abrasive paper about 4" long
    (2" sticking out each side). I turned the IBE on to it's highest
    sped (20,000 rpm) & let it fan the air for about 3 hours. Admittedly,
    fanning the air may not be as big a load as a milling project, but
    the IBE was still going strong after 3 hr. 

    The motor housing was still cool to the touch but the spindle
    housing was slightly warm to the touch. 

Dave
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