Free 186 More Best Homemade Tools eBook:  
Get tool plans

User Tag List

Results 1 to 2 of 2

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

  1. #1
    Supporting Member jjr2001's Avatar
    Join Date
    Jun 2016
    Posts
    927
    Thanks
    1,185
    Thanked 2,092 Times in 562 Posts

    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  

    186 More Best Homemade Tools eBook

  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
    Supporting Member
    DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,055
    Thanks
    793
    Thanked 1,888 Times in 1,683 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:




    2,000+ Tool Plans

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •