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  1. #1
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    1,656

    Default Home made boring bar

    I have been trying to purchase a HSS Boring Bar for my small Lathe, tool holder takes 10mm/3/8 tools can't seem to find anything, I have decided to make one is 4140 ( I have plots of it) suitable for the bar with a HSS cutter
    brazed on.

  2. #2
    Join Date
    Jun 2012
    Location
    SA
    Posts
    1,649

    Default

    Yes. Should be fine.
    The worst that can happen is you will fail.
    But at least you tried.



  3. #3
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi China,

    Quote Originally Posted by China View Post
    I have been trying to purchase a HSS Boring Bar for my small Lathe, tool holder takes 10mm/3/8 tools can't seem to find anything, I have decided to make one is 4140 ( I have plots of it) suitable for the bar with a HSS cutter
    brazed on.
    I've made a few boring bars in my time !

    Personally I would prefer not to braze anything. I use bits of broken taps, drills, in fact anything that I can usefully grind to make a cutter that I can fit into a hole in any old length of suitable (read right size) rod or bar, even turning a bit of square down to fit.

    24-04-2020-003.jpg IMG_0578.JPG

    08-02-2020-004.jpg 08-02-2020-003.JPG

    Here are some pictures of ones that I've made. That first one is a piece of HSS tool bit, that I ground down. Originally for internal threading. Then I bought an insert tool which I now use for threading. And that is only because of the difficulty of grinding single pointing threading bits. A carbide insert for threading is wonderful
    Best Regards:
    Baron J.

  4. #4
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    6,446

    Default

    A grade 8 bolt is a good cheap source for the 4140 to make the bar. The ones I have used drilled and tapped very nicely.

    The 16mm fits into one of my QCTP post units. From there I can step them down to the diameter i need.

    Like Baron J I save all my broken HSS pieces.

    It works well and is cost effective.

    Grahame

  5. #5
    Join Date
    Dec 2005
    Location
    South Australia
    Posts
    1,656

    Default

    Thanks for the suggestions I will rummage through my "I will need that one day pile" and see what I come up with.

  6. #6
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    China i dont know what your lathe can handle but you can also weld a 10mm thick bit of flat on the side of a larger dia bar, or even a few diameters and lengths to give you a bit of range in the size/depth of holes

  7. #7
    Join Date
    Oct 2017
    Location
    Lismore, NSW
    Posts
    58

    Default

    G'Day China,
    Here is a Ø8 boring bar made from a M8 grade 8 bolt shank. The HSS tool bit was ground from a broken No.1 centre drill, that sits in a drilled hole. The HSS is held in position by an M3 grub screw in the end of the bar. This was used to cut a 2.5mm wide keyway, but could also be used for general boring.

    IMG_1079.jpgIMG_1090 (1).jpg

    Hope this helps.
    Regards,
    Don.

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