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  1. #21
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    Talyrond roundness checking machines had some kind of centering and tilt adjustment on the chuck. I haven't touched one in 20 years...

  2. #22
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    Quote Originally Posted by Screwmachine View Post
    I think Hardinge guaranteed 40 millionths on their lathe spindles... You could just get a Moore Nanotech lathe, I'm sure they can advise on chuck options. At 10 millionths you better have surface finish to go along, the Moores can do it.
    Monarch 10EE's were 50 millionths standard, 35 millionths, extra fee. Hardinge would assuredly have seeen to that they competed. LeBlond & Timken did a JV in the mid/late 1960's that claimed tapered roller bearings @ 25 millionths. No idea how long they would HOLD that in-use.



    Time has passed. Lots of time.

    Nanotech, a Moore spin-out, is not the only present-day player.

    The OP may HAVE that need, as it seems "nano" -everything is a growing field.

  3. #23
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    I have made some hydraulic expanding mandrels once
    Very easy
    Just a piece of scrap Turn a shoulder Make a long blind M6 threaded hole in the centre and make a connection from the end of the hole to just before the shoulder
    Weld on a bushing with a decent wallthickness on the piece of scrap Drill a vent hole in the weldment on the front
    Fill the threaded hole with grease with a long srew till it comes out of the vent hole Then block that hole with a set screw
    Then turn it to size
    You clamp the piece by turning the srew It will leak a bit at first but the long thread will seal the grease

    This contraption can clamp really hard So make sure you do not overdo it
    Its a bit like a inverted hydraulic collet chuck
    Make a couple and toss then once they get out of the chuck

    Peter from holland

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  5. #24
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    Quote Originally Posted by Peter from Holland View Post
    I have made some hydraulic expanding mandrels once
    Very easy
    Just a piece of scrap Turn a shoulder Make a long blind M6 threaded hole in the centre and make a connection from the end of the hole to just before the shoulder
    Weld on a bushing with a decent wallthickness on the piece of scrap Drill a vent hole in the weldment on the front
    Fill the threaded hole with grease with a long srew till it comes out of the vent hole Then block that hole with a set screw
    Then turn it to size
    You clamp the piece by turning the srew It will leak a bit at first but the long thread will seal the grease

    This contraption can clamp really hard So make sure you do not overdo it
    Its a bit like a inverted hydraulic collet chuck
    Make a couple and toss then once they get out of the chuck

    Peter from holland
    Peter, I am not sure I understand this. Is the grease expanding the mandrel, or the grease getting between the mandrel and part that clamps?

  6. #25
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    How are they going to check it would be my first concern. It would seem a mandrel between centers would be a possible choice.

    Just holding some parts between centers often gets <.001

  7. #26
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    Quote Originally Posted by stoneaxe View Post
    Peter, I am not sure I understand this. Is the grease expanding the mandrel, or the grease getting between the mandrel and part that clamps?
    Ermm.. if grease gets between the mandrel and the PART? The part has become a bearing.

    NOW we just call the mandrel an "axle".



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