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Thread: Screwhead chuck

  1. #1
    Supporting Member Christophe Mineau's Avatar
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    Screwhead chuck

    Hi,
    I have always been attracted by the lantern chucks I have seen posted here at HMT, and have planned to make one, one day ...
    But as I was recently shopping at the local hardware store, suddenly the light came. I saw a kind of big hose brass fitting like this one :



    I thought that I could do something quick with that, just adding a brass cap nut and a core screw in order to hold any hex screw driver tip to lock the screw against the cap.

    Here are the main parts :
    - on the left, I machined and tapped a sleeve that will be "loctited" inside the brass.
    - the M10 screw will have to get an hex female hole at the end to receive an hex bit like the one above on the picture.
    - The brass body has its main part turned down to make the shaft
    - The cap was surfaced true, on both sides, and a 8 mm hole is center drilled.



    And here the collection of bushings in order to fit any screw diameter : 2, 2.5, 3, 3.5, 4, 4.5, 5, 6
    they are lightly counter sunk in order to fit either flat or counter sunk headed screws
    The screw head has been (badly) knurled and the hex tip has been made.
    That's actually the most difficult part of the job. I drilled a hole smaller that the hex diagonal and then pressed an hex tip in it.
    I removed it and tried to file the inside with small files and a dremel in order to get a slip fit.
    I had to use a dye to readjust the somewhat expended threads as well.



    And here is the assembly and mounted on the lathe.




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    Christophe
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  2. The Following 24 Users Say Thank You to Christophe Mineau For This Useful Post:

    Carnel (Sep 25, 2020), Corm (Aug 31, 2018), gumser (Feb 13, 2021), high-side (Sep 26, 2020), janders1957 (Sep 1, 2018), Jon (May 2, 2018), LMMasterMariner (May 2, 2018), mklotz (Sep 1, 2018), Moby Duck (May 2, 2018), nova_robotics (Sep 24, 2020), olderdan (May 2, 2018), Paul Jones (May 2, 2018), philipUsesWood&Brass (Aug 30, 2018), PJs (May 2, 2018), rayh__ (Sep 24, 2020), reysl1949 (Sep 25, 2020), rgsparber (Aug 30, 2018), rlm98253 (Aug 30, 2018), rossbotics (May 3, 2018), Seedtick (May 2, 2018), Sleykin (May 2, 2018), that_other_guy (Aug 30, 2018), Toolmaker51 (May 2, 2018), volodar (Jan 29, 2019)

  3. #2
    Supporting Member Paul Jones's Avatar
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    Christophe,

    I like your adaptation of the hose brass fitting. Thank you for all the details for making the screw chuck.

    Regards,
    Paul

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  4. The Following User Says Thank You to Paul Jones For This Useful Post:

    PJs (May 2, 2018)

  5. #3
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    Thanks Christophe Mineau! We've added your Screwhead Chuck to our Workholding category,
    as well as to your builder page: Christophe Mineau's Homemade Tools. Your receipt:




  6. #4
    Supporting Member Ralphxyz's Avatar
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    Nice, Thanks!!

    Ralph

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    Supporting Member mklotz's Avatar
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    mklotz's Tools
    Some other thoughts re the threaded rod with the hex hole...

    Buy a cheap screwdriver already fitted with a hex socket and retaining magnet.

    Cut off the end and thread and attach knurled thumb knob.

    or

    Turn down rod and loctite into a hole drilled into an appropriate sized bolt
    ---
    Regards, Marv


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  8. The Following User Says Thank You to mklotz For This Useful Post:

    Carnel (Sep 25, 2020)

  9. #6
    Supporting Member Christophe Mineau's Avatar
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    Thanks Ralph and Marv, good point, if I had to redo, I would try that.

  10. #7
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    Shelly142's Tools
    Christophe,
    Nicely done. I especially like the utilization of as many off the shelf items as possible.
    Like you said there are many different approaches to lantern chucks and this one can
    be added to the mix. Thanks for sharing.

  11. #8
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    I very much enjoy it when things are repurposed to ones special needs.
    You did a good job.
    Thanks for posting.

  12. #9
    Supporting Member desbromilow's Avatar
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    desbromilow's Tools
    Quote Originally Posted by mklotz View Post
    Some other thoughts re the threaded rod with the hex hole...

    Buy a cheap screwdriver already fitted with a hex socket and retaining magnet.

    Cut off the end and thread and attach knurled thumb knob.

    or

    Turn down rod and loctite into a hole drilled into an appropriate sized bolt
    or use a 5/16" SHCS since the socket on that is 1/4" hex - that's what I did with my lantern chuck.



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