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Thread: Longworth Chuck Question

  1. #1
    Join Date
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    Red Deer, Alberta, Canada
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    Longworth Chuck Question

    I'm thinking of building a Longworth Chuck to reverse bowls to finish their bottoms. My lathe has a 12" swing. What is the largest bowl I can mount on a Longworth Chuck if I make it the maximum size for my lathe?
    I realize there are likely a number of variables based on exactly how I build the Chuck. I have a bowl with a 9-1/4" outside diameter that I'd like to mount in it. Is that bowl too large? Anyone with experience using a Longworth Chuck, I'd very much appreciate your feedback.
    Thanks,
    .....Gord
    Why has common sense
    become so uncommon?

    My Woodwork Site

  2. #2
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    Gord, if the curved slots go close to the edges of the chuck, and if your rubber 'buttons' are small enough, I think you might just squeeze by, but it'll be very close.

    Let's see...

    Chuck diameter = 11 7/8"
    Slots to within 1/2" of edge = effective diameter of 10 7/8"
    Account for 1/2" button diameter = effective diameter of 10 3/8"
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

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  3. #3
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    Quote Originally Posted by Vaughn McMillan View Post
    Gord, if the curved slots go close to the edges of the chuck, and if your rubber 'buttons' are small enough, I think you might just squeeze by, but it'll be very close.

    Let's see...

    Chuck diameter = 11 7/8"
    Slots to within 1/2" of edge = effective diameter of 10 7/8"
    Account for 1/2" button diameter = effective diameter of 10 3/8"
    Wow, a math major!!
    Thanks, Vaughn, I'm going to give it a try if I have time this weekend and see what happens.
    Thanks again,
    .....Gord
    Why has common sense
    become so uncommon?

    My Woodwork Site

  4. #4
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    Math major? Me? My freshman college algebra professor suggested I drop out of his class before he had to flunk me.

    Even if the Longworth chuck ends up not fitting the bowl in question, it should be handy down the road for other pieces.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  5. #5
    Join Date
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    After I did a Google on what a Longworth chuck was I found these links that looked good.

    http://www.crwoodturner.com/longworth/

    http://www.scrollsaws.com/images/Lat...hChuckPlan.pdf

    Ignorance is my biggest obstacle to learning
    Last edited by Jim Burr; 03-27-2009 at 11:27 PM.
    Your Respiratory Therapist wears Combat boots

  6. #6
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    Gord, always remember dependant on the actual form of your bowl/buttons you can locate it in expansion mode as well with the buttons on the inner surface, even if it does not actually grip, it can be used to align the piece and use the tailstock and revolving centre to hold it in place.
    Chas. just a traveller on the road of time.

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  7. #7
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    longworth chuck question

    They all beat me to it ,but I made one and it holds a 10" bowl,but I got those little rubber pads right on the edge.Works pretty good.I have the holes drilled in 1/2" increments to take many different sizes.

  8. #8
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    Quote Originally Posted by Ken Ward View Post
    They all beat me to it ,but I made one and it holds a 10" bowl,but I got those little rubber pads right on the edge.Works pretty good.I have the holes drilled in 1/2" increments to take many different sizes.
    Ken, sounds like you're describing Cole Jaws, the ones that attach to your regular chuck and have lots of holes so you can hold different sizes of bowls. Longworth chucks has slotted holes (usually 4, 6 or 8) that are cut in a spiral to make the little rubber pads infinitely adjustable.

    Cole Jaws:



    Longworth Chuck:

    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  9. #9
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    longworth chuck question

    Yup,sorry bout that,but it was late when I responded.

  10. #10
    Hey...a pic of my first Longworth chuck surfaced on the web! How cool is that. I made that about 2 years ago. You can figure loosing 2". So a 12" will net a bowl about 10"....Bill...

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