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Thread: ER32 Chuck for Unimat M12x1

  1. #1
    Supporting Member carl blum's Avatar
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    carl blum's Tools

    ER32 Chuck for Unimat M12x1

    Hi Gang:
    I found a deal on a set of ER32 collets so I started finding chucks for all my machines. MT4 for my Smithy Granite Lathe was easy as well as a R8 for the mill. Then I found 5-C chuck for the indexer. I even found square and hex holders for grinding. But no one had a M12x1 for the Unimat. I held the other chucks up to the Unimat and it could be a good fit.
    I don't like to chase single point threads on the lathe so I try to use "found" threads and stick to tapping holes. The easy way to find the threaded stock and a ER32 nut was to buy a CAT40 - ER32 tool holder on Ebay:
    ER32 Chuck for Unimat M12x1-img_4752.jpg
    The next step was to remove the CAT40 end. Since it is hardened tool steel, the band saw was not going to work. I used an air driven disk cut-off tool in the tool holder ground the holder in two while I spun it in the lathe. It took a while and made a lot of gritty dust, so clean up the ways after if you do this. I made a bushing to weld into the ER32 chuck so I could bore and tap it for the
    Unimat.
    ER32 Chuck for Unimat M12x1-img_4783.jpg
    I put a 3/4" rod in my big lathe and turned a true surface on it. Then I clamped the ER32 chuck on this true surface so when I bored the hole it would run true. I've made all my drill chuck thi
    s way for my Unimat with no problems. Once I had it mounted on my Unimat I checked the runout at the collet taper.
    ER32 Chuck for Unimat M12x1-img_4806.jpg
    It had a bit so I used a lapping stone to correct the runout to less than 0.001"
    ER32 Chuck for Unimat M12x1-img_4807.jpg
    I'm happy with the result and it has the range to clamp wooden dowels with out jaw marks a three jaw chuck would leave.
    Hope this help you with your future projects. Carl.

    PS: I have more photos, but I can't get some to load??



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  2. The Following 4 Users Say Thank You to carl blum For This Useful Post:

    57_210 (Sep 19, 2022), Jon (Dec 20, 2021), mwmkravchenko (Dec 21, 2021), old_toolmaker (Dec 21, 2021)

  3. #2
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    Thanks carl blum! We've added your ER32 Chuck to our Lathe Accessories category,
    as well as to your builder page: carl blum's Homemade Tools. Your receipt:




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  4. #3
    Supporting Member old_toolmaker's Avatar
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    ER Adapter Runout?

    Carl,
    Did you measure the T.I.R. of your finished adapter?



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    Dick


    Links to some of my plans:

    https://www.homemadetools.net/forum/...965#post105972 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

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