Free 186 More Best Homemade Tools eBook:  
Get 2,000+ tool plans, full site access, and more.

User Tag List

Results 1 to 2 of 2

Thread: adjustable 4 jaw chuck keys

  1. #1
    Supporting Member mattthemuppet's Avatar
    Join Date
    Aug 2016
    Walla Walla, WA USA
    Thanked 95 Times in 37 Posts

    mattthemuppet's Tools

    adjustable 4 jaw chuck keys

    I made one of these a while back as I like using 2 keys to adjust my 4 jaw, then the other day I repurposed the original ratty key for a Double Grip chuck so I needed to make another one.

    They're the same as tap chucks in that the T handle can slide in the key handle, with a hard detente at both ends to stop the T handle coming out and a mild detente in the middle for centering. Inside the key handle is a little spring loaded brass piston made from 1/8in rod, with a pen spring pushing it against the T handle.

    The sliding handle is really useful on a 4 jaw as I quite often have to adjust one jaw at the back of the lathe or in some funky position, and being able to slide the T handle out of the way often makes the difference to getting the piece set up.

    adjustable 4 jaw chuck keys-img_5382.jpgadjustable 4 jaw chuck keys-img_5383.jpgadjustable 4 jaw chuck keys-img_5384.jpgadjustable 4 jaw chuck keys-img_5385.jpgadjustable 4 jaw chuck keys-img_5386.jpgadjustable 4 jaw chuck keys-img_5387.jpgadjustable 4 jaw chuck keys-img_5388.jpg

    The key end was turned down to the diagonal of the female square in the chuck, then the collet chuck stood on end in my "mill" to cut the flats. Then the hole for the T handle drilled (do this before the end hole for the brass piston) and drill reamed for the handle (didn't have a 7mm or close imperial reamer). Put it back in the lathe and drilled the hole for the piston so that the 1/8in brass rod was a sliding fit. The rest is pretty trivial.

    2000 Tool Plans 186 More Best Homemade Tools eBook

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

    C-Bag (Oct 13, 2016), Paul Jones (Oct 11, 2016), PJs (Oct 11, 2016)

  3. #2
    Content Editor
    Supporting Member
    DIYer's Avatar
    Join Date
    Aug 2013
    Thanked 1,821 Times in 1,626 Posts

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

    186 More Best Homemade Tools eBook Homemade Tools eBooks

Thread Information

Users Browsing this Thread

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


Posting Permissions

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