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  1. J

    Material Question

    I will cut back to the mounting hole as you suggest. Thanks John Dunbar
  2. J

    Material Question

    Here is the one I made. I used a 1/4" HSS bit. I made the square hole by drilling the four corners with a 1/16" drill bit, then drilled the center with a 1/4" bit. After about ten minutes cleaning up the hole with a file, I pressed the lathe bit to clean up the square hole. The differential...
  3. J

    Material Question

    Niels I made my toolholder by threading one side 3/8"-24 and the other side M8. It grips very well on the HSS bit. I don't know the advantages of using the threaded insert. I used a grade 8 socket head cap screw. Grade 8 screws are typically made of 4140 which can be hardened. Heat to...
  4. J

    Carbide tangentials for small lathes

    I have a Southbend 10K, which I believe is very similar to the Boxford. I prefer to use HSS bits because I can get a really nice edge easily. Thanks for the help. John Dunbar
  5. J

    Carbide tangentials for small lathes

    Thanks Niels, the drawing is very helpful. I am going to try this design. John Dunbar
  6. J

    Carbide tangentials for small lathes

    Niels I made one of your tools several years ago. This quickly became my favorite tool. The only thing I dislike about the tool holder is taking the bit out to sharpen and reset the height. It is the version that a screw runs inside the holder and pulls the bit back against the holder to keep...
  7. J

    Another Reason to buy or make a diamond tool holder

    I bought a used broach for $30 to make this tool and to make a boring bar. You simply drill an undersized hole and push the broach through using a press or vice and you end up with a perfect square hole. The broach is a piece of HSS that starts out round to fit the pilot hole, and then is a...
  8. J

    Another Reason to buy or make a diamond tool holder

    Here are pictures of mine, thanks for the help. I used a 3/16" broach which worked great to house the tool bit. This tool works better than the quick change tool post version that I made several years ago. John Dunbar
  9. J

    Another Reason to buy or make a diamond tool holder

    What angle is the bit tilted foward and is the bit ground at 30 degrees. Thanks John
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