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  1. #1
    Join Date
    Sep 2004
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    Default Chuck back plate

    Lathe 4 jaw chuck rear.jpgThis chuck has been machined with the two surfaces shown by the green arrows, level with each other.
    As it is impossible to source a cast iron back plate, or a suitable blank, I have started fabricating one, and I though it might be an idea to cut a few thou relief in the back plate surface, to make one of these two surfaces, the contact surface, rather than have both as contact surfaces, and I am leaning towards the outer.
    Good idea, bad idea, doesn't matter??

  2. #2
    Join Date
    Nov 2010
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    Frankston south
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    Default

    Not sure how big the chuck is but most of the ones I have seen only use the smaller diameter

  3. #3
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    Default

    Wouldn't worry about touching the Outside face of the chuck, when the backing plate is made it should have a diameter about an inch bigger than the mounting holes PCD.

  4. #4
    Join Date
    Sep 2012
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    Default

    Hi Guys,

    I agree ! Don't worry about the outer edge. All the support should be in the centre part.

    FWIW I've seen a cast iron steam pipe flange used as a chuck backplate !
    Best Regards:
    Baron J.

  5. #5
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    Default

    Quote Originally Posted by pipeclay View Post
    Wouldn't worry about touching the Outside face of the chuck, when the backing plate is made it should have a diameter about an inch bigger than the mounting holes PCD.
    Well I wish I had asked a question BEFORE I bought and started machining a 210mm diameter piece of carbon steel, based on what the guy that sold me the chuck (200mm chuck) said.
    Too late now, so it will be 200mm diam. back plate....too much work to make it smaller, so I'll shave a couple of thou off the outer edge of the plate

    BaronJ, the flange would have had to be around 40+mm thick to provide the 24mm snout that goes over the spindle to the register, and even if I could have found on that thick, it would have been a LOT of machining to form the snout.

  6. #6
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    Sep 2012
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    Default

    Hi Phill,

    Too late now, so it will be 200mm diam. back plate....too much work to make it smaller, so I'll shave a couple of thou off the outer edge of the plate
    In that case I wouldn't bother. A slight gap might make it ring !
    Best Regards:
    Baron J.

  7. #7
    Join Date
    Sep 2004
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    Dardanup W.A.
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    Default

    Quote Originally Posted by BaronJ View Post
    Hi Phill,

    In that case I wouldn't bother. A slight gap might make it ring !
    Thanks for that advice. It would be very annoying if it did ring.

  8. #8
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    Default

    Pity you didn't know what was really required as you could of sourced a piece of cast to suit.

  9. #9
    Join Date
    Sep 2004
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    Default

    Quote Originally Posted by pipeclay View Post
    Pity you didn't know what was really required as you could of sourced a piece of cast to suit.
    That would have been nice
    Gotta love hindsight.

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