Looking to Identify exactely what "This" is
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  1. #1
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    Smile Looking to Identify exactely what "This" is

    I have this sitting around for ages, but dont have any idea what it is..came with some collets I purchased_dsc2782.jpg_dsc2781.jpg

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    Is it a Small 3 jaw chuck without the top jaws?. Similar to the 50-3-2.5 BC model

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    WAG, some type of shaft clutch.

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    If you push and pull on the threaded end, do the three things that look like chuck master jaws move out from and in to the center? The amount of motion would be small, like roughly 0.020". If so, this is just a piece of an air- or hydraulic-operated chuck. An actuator screws into the threaded end, routed through the spindle hole. (Probably) serrated master jaws would mount to the things that look like master jaws, then actual jaws would mount to those serrated master jaws. But there's several pieces missing from this, if that's what it is.

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  6. #5
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    Have you looked under the crud for lettering or logos? Might be clues there.

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    Is that a 1/2-20 thread in there?

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    Looks like a diaphragm chuck.
    workholdingbasics2.jpg-width-860.jpg

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    I think it needs more dust!

  11. #9
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    Quote Originally Posted by Mud View Post
    Looks like a diaphragm chuck.
    workholdingbasics2.jpg-width-860.jpg
    If the threads are 1/2-20 then it will fit on a drill.

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    Mounting this on a drill would be silly if the threaded end is intended to open/close the jaws. If this is what we think it is, the body is what's mounted to the spindle, and the threaded end is pulled to close the jaws. If you just screwed the threaded end to a drill spindle, the chuck wouldn't grab anything.

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  14. #11
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    Quote Originally Posted by sfriedberg View Post
    Mounting this on a drill would be silly if the threaded end is intended to open/close the jaws. If this is what we think it is, the body is what's mounted to the spindle, and the threaded end is pulled to close the jaws. If you just screwed the threaded end to a drill spindle, the chuck wouldn't grab anything.
    If mounted to a drill, you just pull the chuck body back. Besides, silly things exist and have a purpose. I've chucked all sorts of weird things in a drill to twist or wind wires, polish or chamfer parts, drive handwheels of machinery, test clutch engagement, drive large taps and oversized tooling, etc.

    It seems totally reasonable to want to chuck a lot of the same diameter part in a drill quickly and repeatedly. Maybe to save on an additional facing/deburring machine cycle on the back side of a turned part, for example.


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