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Thread: A fast and easy lathe bump tool for quick change tool posts

  1. #1
    Supporting Member metric_taper's Avatar
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    A fast and easy lathe bump tool for quick change tool posts

    I saw a post last week on this tool. And I was using the one I made several years ago, multiple times last week. I only have the bearing on one end of the tool shank, and had to change between using it on a short cylinder and a thin disk mounted in the 3 jaw chuck. I realized that if I put the bearing on each end of the tool, it makes the job just moving it to the other face of the quick change tool post.

    I would have modified the tool, but the square shank was not long enough. I had made them both using dead brazed carbide tool shanks, 1/2", and 1". I thought it a pain to have to loosen the hex set/grub screws to manually flip the bearing orientation.
    I did a quick youtube search on this tool, and they all have the bearing mounted on the side of the tool shank used. Some machined out a recess for the bearing. And I see many youtube videos with a bearing on each end. Some used pricey cam follower bearings.

    As my bearing was always on the end of the tool, and was just a drilling operation, and tapping the bolt thread into the end of the material. But it did require setting up the square stock in a 4 jaw lathe chuck, I saw no reason to not use round stock, and get rid of the 4 jaw dialing in. And I have lots of round bar.


    Note my square shank tools were too short to mount another bearing on, as the QCTP holder is longer then the brazed carbide shank.
    I got round bar from my stock (1/2" and 1") and made one for my 250-101/102 quick change tool holder, and one for my 250-401/402.

    I had the ball bearings, 6200 and 6201, having a 10mm and 12mm ID. And I had the metric flange bolts in a large assortment.
    I must have salvaged the bearings from stuff, as you can see they are not new. I just checked eBay and they are ~$12 for qty 10 with either the metal shields or rubber seals.


    A fast and easy lathe bump tool for quick change tool posts-img_20230322_165114.jpgA fast and easy lathe bump tool for quick change tool posts-img_20230322_165305.jpg
    A fast and easy lathe bump tool for quick change tool posts-img_20230322_193733.jpgA fast and easy lathe bump tool for quick change tool posts-img_20230322_193755_1.jpg
    Attached Thumbnails Attached Thumbnails A fast and easy lathe bump tool for quick change tool posts-img_20230322_193755.jpg  

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    Last edited by metric_taper; Mar 23, 2023 at 05:52 PM.

  2. The Following 8 Users Say Thank You to metric_taper For This Useful Post:

    drivermark (Mar 24, 2023), EnginePaul (Mar 25, 2023), Jon (Mar 23, 2023), mr mikey (Mar 24, 2023), nova_robotics (Mar 23, 2023), rebuilder1954 (Mar 27, 2023), Sleykin (Apr 16, 2023), trevor_60_r (Mar 26, 2023)

  3. #2
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    Thanks metric_taper! We've added your Lathe Bump Tool to our Lathe Accessories category,
    as well as to your builder page: metric_taper's Homemade Tools. Your receipt:




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