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    Making A Jam Chuck

    Uploaded by

    HomerSimsonnakis

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Making A Jam Chuck

    Uploaded by

    HomerSimsonnakis
    56 views1 page

    Original Title

    000000038 Making a Jam Chuck

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    © © All Rights Reserved

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    Copyright:

    © All Rights Reserved
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    56 views1 page

    Making A Jam Chuck

    Uploaded by

    HomerSimsonnakis

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    I N T H E S H O P

    Making a
    Jam
    Chuck
    T urning a project on the
    lathe (like the ring boxes
    shown on page 12) presents an
    the face-
    plate, the
    first thing to
    try again without much waste.
    TAPER. Once you’re satisfied
    with the fit, the next step is to
    interesting challenge. do is to turn it taper the tenon (about one or two
    That’s because the insides of to a cylinder. (I use a square-end degrees) as you cut it to full depth,
    the base are scooped out first. scraper.) Then true up (flatten) see detail ‘b.’ This allows you to
    Then, after removing the base the face of the jam chuck. “wedge” the base onto the tenon.
    from the lathe, the hollowed out TENON. Now you’re ready to To complete the jam chuck,
    end needs to be remounted so turn the tenon. The goal is to get there’s one last thing I like to do.
    you can turn the bottom. the tenon to fit tight inside the I flatten the angled shoulder
    This is the challenging part. base. The only problem is the dif- that’s formed when the taper is
    How do you mount the open end ference between a tight fit and cut, see detail ‘c.’
    of the base to the lathe without one that’s too loose is less than MOUNT BASE. Now you’re
    using a specialized chuck? the thickness of a piece of paper. ready to mount the base on the
    JAM CHUCK. The solution is a So the best way to get a good jam chuck. Start by pressing it
    simple “jam” chuck. Basically, fit is by feel. To do this, you’ll firmly onto the tenon. Note: As
    this is just a block of wood with a need to sneak up on the final size long as the base is secure, it
    round tenon. The tenon fits inside of the tenon by making a series doesn’t need to sit flat against
    the opening of the base and holds of small cuts, see detail ‘a’ below. the face of the jam chuck.
    it in place with a friction fit. One more thing. When you’re Then turn the lathe by hand to
    To make a jam chuck, I usually trying to get the tenon to fit in check that the base is centered. If
    glue up a block from pieces of the opening, it’s best to cut a short it’s not, just tap the “high” side a
    3/ "-thick stock. The block is
    4 (1/16") tenon. This way, if you few times with a mallet. Then, flip
    simply screwed to the metal face- remove too much material (and the lathe on and off quickly to
    plate that threads onto the lathe. the fit is too loose), you can true make sure that the base is secure
    Once the block is secured to up the face of the jam chuck and before you start turning.

    No. 38 ShopNotes 29

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