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  1. #1
    Join Date
    Sep 2004
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    Dardanup W.A.
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    331

    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
    Location
    Frankston south
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    102

    Default

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

  3. #3
    Join Date
    Jun 2007
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    sydney ( st marys )
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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
    Location
    York, North Yorkshire UK
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    6,439

    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
    Join Date
    Sep 2004
    Location
    Dardanup W.A.
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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
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
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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
    Location
    Dardanup W.A.
    Age
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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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    Jun 2007
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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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    Dardanup W.A.
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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.

  10. #10
    Join Date
    Sep 2004
    Location
    Dardanup W.A.
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    Default

    20191219_193924.jpg20191219_193747.jpg
    New chuck finally mounted.
    In the end I had to machine down the backplate to the smaller diameter simply because when it was assembled the unit was too heavy for me to lift onto the spindle with any control. It took a fair amount of time, and produced two 25 litre bins full of steel wool, but well worth it in the end.
    Attached Images Attached Images

  11. #11
    Join Date
    Aug 2019
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    Revesby - Sydney Australia
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    1,183

    Default

    50 litres of steel wool?

    You will have the cleanest pots in Dardanup!

  12. #12
    Join Date
    Sep 2004
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    Dardanup W.A.
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    Default

    Quote Originally Posted by nigelpearson View Post
    50 litres of steel wool?

    You will have the cleanest pots in Dardanup!
    Went straight in the bin. High tensile springs, all with rough edges all knotted together amounts to a real nightmare to clean up.
    I tried the vacuum cleaner, blocked the hose in no time, and lots of time to get the damned things out, then a broom, but they clung onto the broom bristles like magnets, so in the end it was pick up by hand and buy a dedicated shed broom for the smaller bits.
    In the end I was sooooo glad to see them going down the street in the truck

  13. #13
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
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    Hi Phil, Guys,

    You need a magnetic wand ! Unfortunately it doesn't do anything for brass or aluminium.

    I made mine from magnets salvaged from hard disc drives. Saves a lot of grief blocking up the wife’s vac.
    Best Regards:
    Baron J.

  14. #14
    Join Date
    Sep 2004
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    Dardanup W.A.
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    Default

    Quote Originally Posted by BaronJ View Post
    Hi Phil, Guys,

    You need a magnetic wand ! Unfortunately it doesn't do anything for brass or aluminium.

    I made mine from magnets salvaged from hard disc drives. Saves a lot of grief blocking up the wife’s vac.
    Sounds like a good idea, more info required

  15. #15
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default Chuck back plate

    Quote Originally Posted by ptrott View Post
    Sounds like a good idea, more info required
    As the priest said to the actress....

    Mine is probably bigger than most but take a look:

    Outer is 50mm pvc with a cap on the end and a flange about 250mm back from the end



    Inner is 40mm pvc pipe with a large magnet stuck in the end



    In use you slide the inner all the way down, poke it at your dwarf to pick it up, take it to the bin and withdraw the inner.
    Swarf falls off the end or follows the magnet up until it hits the flange and then falls off.



    Simple

    Steve

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