[Jewelry making - Article 00215] - Re: [Orchid] Replace the chuck on a low end bench drill press?

[Dave Arens]

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Hi Christine,

>     I asked her if there was a size to the spindle that I needed to be
>     aware of when looking for a new chuck, and (after asking someone
>     else) told me "33, tapered."


    Drill chucks are usually attached to the quill of a drill press in
    one of two ways.  The 1st way involves a threaded connection similar
    to a nut & bolt; the quill is threaded like a bolt & the chuck is
    threaded like a nut. The 2nd  way involves the used of a tapered
    connection. The hole for connecting the chuck to the quill is
    tapered & ground smooth. The end of the quill also has a matching
    taper. The chuck is pressed on the tapered quill. The nice thing
    about this type of connection is that it holds very tight, yet can
    be removed with out causing damage (usually). 

    This 2nd method usually uses a shank that is tapered with a taper to
    match the chuck (usually a #33 Jacobs taper) on one end & a #1, #2
    or #3 Morse taper on the machine end. (the different Morse tapers
    are used to accomodate small & large machines. This scheme makes it
    relatively easy to exchange tooling on the machine. 

    The #33JT is a standard taper used for a lot of  0 to 1/2" drill
    press chucks. When looking in a catalog for drill chucks, look for a
    column label Mounting Type or JT  Taper Mount. There are  several
    different tapers used for mounting  chucks. 

    Dave 
 

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