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  1. #1
    Join Date
    Nov 2017
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    Geelong, Australia
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    2,651

    Default Tru-grip chuck??

    Anyone seen one of these Tru-grip chucks before?

    Taper is NT40, there's a small center piece inside the body and looks like there should be some type of collet to go with it.









    Steve

  2. #2
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    1,656

    Default

    I gave one to a mate a couple ago years ago, did not fit any thing I have it is a collect chuck I think they come in various size collects

  3. #3
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    57
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    2,651

    Default Tru-grip chuck??

    I can't find anything about it online, and its a weird design. The taper on the body would tend to spread a collet, so I'm assuming its not relevant to the clamping.
    When you screw the nut on fully there is still a gap between the body taper and the nut taper, so I'm guessing the collet might have looked something like this in section:



    Steve

  4. #4
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
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    1,075

    Default

    I suspect the centre in the bottom is not for the collet, but rather as a stop for the tool so you can take it out for sharpening and put it back at the same depth to avoid having to reset your Z-axis mid job.

    I found this pic of various collet styles including some old/obsolete ones, perhaps it's an E (as opposed to ER)

  5. #5
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Guys,

    It reminds me of the "Autolock" tool holder, particularly with the centre pin. It probably would work in a similar way ! With the right collets of course.
    Best Regards:
    Baron J.

  6. #6
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    Clarkson chuck. I think was the first and should give plenty search hits.
    Uses threaded shank milling cutters

  7. #7
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    P.s. the collet is threaded. The cutter screws through the collet, hits the center, forcing the collet towards to nut and this locks everything up

  8. #8
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    Default

    Definitely not a Clarkson autolock as they have a lugged base on the collet that is larger diameter than the body. This Tru-Grip has a parallel internal diameter for most of the way, then relieved slightly larger at the base where the center part is located.
    Also not an E collet as they have a tapered body.
    I agree that the center is more likely to be a stop for the tool than the collet though.

    Steve

  9. #9
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default Clarkson Autolock Chuck

    Hi Guys,

    These are the the best pictures that I cold find of a Clarkson Autolock on an int 40 taper.

    s-l225.jpg a-l225.jpg
    The collet and a chuck, though I don't think that the collet fits that chuck.
    Best Regards:
    Baron J.

  10. #10
    Join Date
    May 2015
    Location
    Richmond
    Posts
    214

    Default

    Osborn Titanic II collet chuck.
    Attached Images Attached Images

  11. #11
    Join Date
    Nov 2017
    Location
    Geelong, Australia
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    57
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    Default

    Awesome - thanks!!

    Steve

  12. #12
    Join Date
    Jul 2012
    Location
    Griffith NSW
    Posts
    435

    Default

    I had one of those mounted on an R8 shank for a chinese made mill drill toy. Granted, the mill drill was a complete POS, but I was not a fan of the collet chuck either. I could never get endmills to register on centre in the chuck, forever cutting a flute a lot heavier than the others. I ditched it for a chinese made ER32 collet and it was lightyears ahead of it. Then someone stole it and...well...I wasnt exactly upset to see it gone...

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