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Thread: Twin 4J chuck keys

  1. #1
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    petertha's Tools

    Twin 4J chuck keys

    I made a pair of identical chuck keys specifically for setting up my 4-jaw chuck. Not my idea, I saw it somewhere. But it works quite well because you can adjust the opposing jaws simultaneously in unison while watching the dial, converging on the target with both jaws tight. Its easier to do than explain but saved me set dial-in time because normally I am slow as a tortoise.

    I found a piece of 0.750" diameter mystery metal which looked nice & shiny - always a dangerous sign It wasn't magnetic so I knew it was some kind of stainless. Not the most fun to machine but oh well, used up the scrap & it wont rust -LOL. Initially I was going to make a knob but didn't like how it looked so went the tommy bar route. Notice my goof up, the tommy bar is not aligned to the square facets. Oops. Then I looked at my other commercial chuck keys - neither are they! Haha. So its a design enhancement, not a screw up.
    Twin 4J chuck keys-img_6742_edited-1.jpg
    Twin 4J chuck keys-img_6744_edited-1.jpg
    Twin 4J chuck keys-img_6745_edited-2.jpg
    Twin 4J chuck keys-img_6749_edited-1.jpg
    Attached Thumbnails Attached Thumbnails Twin 4J chuck keys-img_6743_edited-1.jpg  

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  2. The Following 11 Users Say Thank You to petertha For This Useful Post:

    high-side (May 7, 2020), jjr2001 (Mar 2, 2018), Jon (Mar 2, 2018), LMMasterMariner (Mar 3, 2018), mklotz (Mar 2, 2018), mwmkravchenko (Mar 2, 2018), Paul Jones (Mar 2, 2018), Peter Sanders (Mar 2, 2018), PJs (Mar 5, 2018), Scotsman Hosie (Feb 20, 2022), Seedtick (Mar 2, 2018)

  3. #2
    Supporting Member mklotz's Avatar
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    mklotz's Tools
    Welcome aboard. I recognize your screen name from the Model Engine Maker forum. I think you'll enjoy the time you spend here; a very laid back forum much like MEM.

    I've been championing the two wrench technique for the 4jaw for a very long time...

    http://www.homemadetools.net/forum/c...aw-chuck-27241

    http://www.homemadetools.net/forum/4...3940#post79042

    It gladdens me to hear that folks are beginning to use the technique.

    2000 Tool Plans
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    Regards, Marv

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    https://www.myvirtualnetwork.com/mklotz

  4. #3
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    petertha's Tools
    Yes, likewise Marv. I recognize your avatar & posts.
    Thanks for the usage links. It really makes a fiddly, time consuming task less so, especially when you don't do it every day.

  5. #4
    Supporting Member jjr2001's Avatar
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    jjr2001's Tools
    Nice looking set of chuck keys.
    Another tool to my make it soon list.

    Cheers, JR

  6. The Following User Says Thank You to jjr2001 For This Useful Post:

    Paul Jones (Mar 2, 2018)

  7. #5
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    Thanks petertha! We've added your Twin Chuck Keys to our Workholding category,
    as well as to your builder page: petertha's Homemade Tools. Your receipt:




  8. #6
    Supporting Member ncollar's Avatar
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    Perertha
    Very nice keys, you did a very nice job even if the "T" is not clocked with the square. Very nice work.

    Marv
    I totally agree with the double key process, what ever make our work easier or quicker is great. But I guess if we were a professional machinist the single key would be just fine.
    Nelson

  9. The Following User Says Thank You to ncollar For This Useful Post:

    volodar (Jan 29, 2021)

  10. #7
    Supporting Member Karl_H's Avatar
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    Quote Originally Posted by ncollar View Post
    I guess if we were a professional machinist the single key would be just fine.
    Nelson
    I just got an image of Abom79 trying to use 2 keys on his 36 inch 4 jaw!



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