D1-3 Back Plate
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Thread: D1-3 Back Plate

  1. #1
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    Default D1-3 Back Plate

    Guys I have two 8" chucks one is made over seas which is(I believe) a D1-3,the other chuck is an 8"Cushman with a thread on back plate which I no longer have that lathe.What I like to do is find a back plate that will fit the Cushman so it work on the D1-3 spindle.But the Cushman it has a taper on the inside to line up the back plate with the chuck so I'm thinking that may be a no go,cause I just can't find one.So my next though is maybe machining the original back plate to fit,maybe drill and tap for those 3 camlock pins.I'm somewhat new at this so machining skills are limited,but have access to a mill.Any ideals/thoughts to locating a back plate or where to find the Camlock pins?Thanks for help
    Attached Thumbnails Attached Thumbnails chuck.jpg   chuck2.jpg   chuck3.jpg   chuck4.jpg  

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    I've done this once on a 6" Cushman 4-jaw chuck that had a D1-3 integral back. Machine the back plate to catch the inside edge of the D1 taper. A 1/4" boss is all you need. Next, drill the back plate to accept 7/16-20 Socket Head Cap Screws. The heads do not need to be countersunk into the back plate if the thickness is not there. Ken

    Edit: IF your worried about the void left from not using a full length nose for the D1 taper. Make you a ring to mount to the face of the back plate to take up the space and give you a more realistic D1 nose if you like.

  3. #3
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    Chuck back was originally A-5 - see number tag

    Looks like it has been drilled, tapped and counter bored for 4 of the six D1-5" cam lock pins. If the counter bores are 3/4", this is even more likely


    Existing A-5 thru holes - which will be counter bored on face of chuck - are on a 4.125" diameter bolt circle - per ASA/ASME B5.9 Spindle Noses.

    They are for 7/16" socket head cap screws

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  5. #4
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    Good catch John, I overlookd that on the chuck. Ken


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