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  1. #1
    Join Date
    Oct 2012
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    Mullaloo WA
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    71

    Default 4 Jaw Chuck Wanted

    Smallish 4 jaw chuck wanted, my current lathe has a large 4 jaw chuck which I am increasing finding hard to move. It is 12 inches and heavy construction a lovely chuck but a bear to move around. I am now 73 years of age and no longer as strong as I used to be. What I want is a smaller. lighter chuck independent 4 jaw. My lathe has a D1-6 cam lock headstock which will limit my choices somewhat. A couple of fixes are fit a suitable backing plate to a chuck designed for a smaller one or rig up some sort of crane arrangement. Floating this to see if anyone has a redundant chuck sitting around. I am in Perth but would be willing to arrange a courier if needed. Heres hoping.

  2. #2
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    57
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    6,138

    Default

    How small can you go and still fit the D1-6 camlock? Lathes.co.uk lists the OD at around 165mm (not sure exactly which one it it is), which means at least a 6 1/2" diameter. I think the next size up is probably 8"

    Michael

  3. #3
    Join Date
    Nov 2017
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    Geelong, Australia
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    55
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    Default

    Assuming you’ve got a decent 3 jaw, another option is to just grip a smaller 4 jaw in that.

    Steve

  4. #4
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    Default

    Quote Originally Posted by OxxAndBert View Post
    Assuming you’ve got a decent 3 jaw, another option is to just grip a smaller 4 jaw in that.
    It would probably work better the other way around - if the 3 jaw was in a large 4 jaw, you could centre stock in the 3 jaw without (hopefully) having too much of an off-centre load.

    Michael

  5. #5
    Join Date
    Aug 2019
    Location
    Revesby - Sydney Australia
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    55
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    701

    Default

    Quote Originally Posted by Michael G View Post
    It would probably work better the other way around - if the 3 jaw was in a large 4 jaw, you could centre stock in the 3 jaw without (hopefully) having too much of an off-centre load.

    Michael
    That assumes the material is round or hex.

    Won't work for square or irregular

  6. #6
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    Default

    Quote Originally Posted by nigelpearson View Post
    That assumes the material is round or hex.

    Won't work for square or irregular
    So you take the 3 jaw out and use the 4 jaw that is still attached to the lathe...

    Michael

  7. #7
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    Default

    Quote Originally Posted by Michael G View Post
    It would probably work better the other way around - if the 3 jaw was in a large 4 jaw, you could centre stock in the 3 jaw without (hopefully) having too much of an off-centre load.

    Michael
    I disagree Michael.
    With the caveat that the OP has a decent 3-jaw (ie suitable size and runs pretty true), putting a smaller 4-jaw in that won't introduce any off center load. The 4-jaw would be centered naturally.
    Obviously then chucking something off-center in the 4-jaw will, but no more than it will if that 4-jaw was mounted directly to the spindle.
    Unless you are referring to the off-center load in combination with the distance from the spindle. Yes - potentially slightly more "leverage" on the spindle due to the stick-out, but since we're talking small 4 jaw on a machine that can handle a large chuck anyway I don't think that would be an issue.

    Also - somewhat making the assumption that OP doesn't need the capacity of his large 4-jaw, is happy with whatever 3-jaw he has, and likely mostly uses that anyway. So keep the 3-jaw on, and throw in the small 4-jaw when required.

    Steve

  8. #8
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    57
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    Default

    If I have to do repetitive parts, I'd much prefer a 3 jaw to hold them and centre (or off centre) that chuck once in a 4 jaw than having to re-centre every time, which you would have to do if you had a small 4 jaw in a larger 3 jaw. The OP has a 12" 4 jaw, so that could hold a decent sized 3 jaw. I would imagine that his 3 jaw is 6 to 8", so the size of 4 jaw he could put in that would be far smaller.

    I'll have to disagree with your disagreement.

    Michael

  9. #9
    Join Date
    Jun 2011
    Location
    Australia east coast
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    Default

    Quote Originally Posted by Michael G View Post
    How small can you go and still fit the D1-6 camlock? Lathes.co.uk lists the OD at around 165mm (not sure exactly which one it it is), which means at least a 6 1/2" diameter. I think the next size up is probably 8"

    Michael
    Yeah 8" is the go - I have an 8" 3 jaw on a D1-6 mount.

    I also have a 12" Bison 4 jaw and it's a LOT heavier than even the 10" 4 jaw chuck let alone the 3 jaw.

    So depending on the size of stuff needing to be gripped, I'd go for an 8" chuck. Lots on fleabay, probably as good a source as anywhere.

    I'm facing the same issues myself - getting older and not wanting to handle big/heavy chucks. I just fitted a 12" 4 jaw to my DS&G lathe because I had it there but I'm looking for smaller & lighter ones right now.

    As for gripping a smaller chuck in a larger one, I don't do that. Just don't like the idea.

    PDW

  10. #10
    Join Date
    Jun 2005
    Location
    Townsville, Tropical Nth Qld.
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    212

    Default

    Well I am in the same boat age wise, so I built a swingarm above the lathe and use a $20 block and tackle to change my chucks. It's manual, but if I had the room, I would have an electric winch, cheap as at the big green shed.
    Rgds,
    Crocy.

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