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Thread: Adjust Tru Chuck for the lathe tail stock or a drill press chuck

  1. #1
    Supporting Member jjr2001's Avatar
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    jjr2001's Tools

    Adjust Tru Chuck for the lathe tail stock or a drill press chuck

    Still working on my little problem with one of the 4 chucks I bought and their arbors.
    None of them were true. Chucks run out and arbors run out except for one.
    The R8 to 5/8-16 jacobs chuck worked right out of the box. The pair are better than .0015"
    which is a number I can live with.

    On the other hand the MT2 to 5/8-16 Jacobs chuck was running about .013"....Yuck......

    So I stole the Buck Chuck method (sort of) and made a simple adapter on the lathe that
    would allow aligning the chuck to the arbor better than .001"..
    And yes it works great.

    The housing is 1.750" for the OD
    Single point the ID thread (5/8-16) in the housing while still in the lathe.
    Bore out the housing to 1.250" diameter and .625" deep. This will
    be the well for the adapter.
    Drill 4 set screw holes in the housing (10-32) seemed like a good place to start.
    These will be the adjustments and the holding force for the chuck adapter.
    They must be positioned in relation to the V-groove so they push the adapter
    to the rear of the housing.
    Turn the 5/8-16 OD thread for the adapter on the lathe as well.
    The adapter's OD should be about .020" smaller than the housing diameter
    which makes it about 1.230".
    The chuck adapter has a V-groove that pushes the adapter to the rear of the housing.
    The front portion of the V-groove was removed for screw clearance.
    The set screws points were ground with a tapered end. (not shown)

    Now I need this just for center drilling on the lathe so the set screws will have
    enough force to keep the adapter from spinning. If you need a lot of torque then
    I would add at least 2 cap screws (counter bored) that would be installed from the
    back of the housing and into the chuck adapter. These would be snugged up while
    aligning the adapter and then tightened full after the alignment was completed.
    My lathe has an MT-3 taper in the head stock so I used a MT3 to MT2 adapter
    to hold my MT2 arbor while dialing it in.

    One day project to make a true running chuck adapter.
    Attached Thumbnails Attached Thumbnails Adjust Tru Chuck for the lathe tail stock or a drill press chuck-img_1149.jpg   Adjust Tru Chuck for the lathe tail stock or a drill press chuck-img_1162.jpg  

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  2. The Following 3 Users Say Thank You to jjr2001 For This Useful Post:

    Okapi (Jun 1, 2017), olderdan (Jun 1, 2017), Seedtick (Jun 2, 2017)

  3. #2
    Content Editor
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    Aug 2013
    Thanked 1,510 Times in 1,353 Posts

    Thanks jjr2001! We've added your Chuck Truing Adaptor to our Machining category,
    as well as to your builder page: jjr2001's Homemade Tools. Your receipt:

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