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Thread: parting tool for small lathes

  1. #1
    Supporting Member celsoari's Avatar
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    parting tool for small lathes

    how i made this tool:




    greetings from Brazil

    Celso Ari

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  2. The Following 10 Users Say Thank You to celsoari For This Useful Post:

    baja (Dec 23, 2020), brianr47 (Dec 23, 2020), bruce.desertrat (Dec 22, 2020), Crusty (Dec 23, 2020), jimfols (Dec 22, 2020), Jon (Dec 22, 2020), nova_robotics (Dec 22, 2020), olderdan (Dec 23, 2020), old_toolmaker (Dec 26, 2020), sacco1 (Dec 25, 2020)

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




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    celsoari (Dec 26, 2020)

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    That's an interesting tool holder and I may make one for myself.

    For now though, I part off by running the lathe in reverse with my tool on center but mounted upside down and that makes the tool push away from the work when it grabs instead of digging in, plus the chips fall downwards out of the way immediately. Rigidity is an issue on my lathe and this technique minimizes the effects of it's absence.
    If you can't make it precise make it adjustable.

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    celsoari (Dec 26, 2020), olderdan (Dec 27, 2020)

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    Supporting Member Crusty's Avatar
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    I've just almost finished my tangential tool holder that's similar to your version. Actually it's cutting beautifully and I'm waiting for some black oxide solution to surface treat it before posting it here. Maybe one of those cutoff tool holders is next, but for now I'm loving making chips with my new tool holder. I'd heard that they were good but I didn't have a clue that they were this good and I've never made a chip before that was 3' long. Thanks for the inspiration.

    parting tool for small lathes-first-cuts.jpg

    First cut
    (no file work)
    If you can't make it precise make it adjustable.

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    celsoari (Jan 3, 2021)

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    I agree Crusty, a rear inverted parting tool is the best way for a small lathe. I can part off 2 inch M/S stock on power feed on my old SB lathe with that method using a carbide insert tool. Assuming that you can mount a rear toolpost on the lathe that you have.

  10. #6
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    So what's so new about that design for the parting tool, it was invented when Christ was an ankle-biter, it's been around for more than a century.

    A simple google brings up quite a few of the exact same design.

    https://www.google.com/search?q=spri...w=1507&bih=923

    Amazon were even selling this type of parting-off tool.

    https://www.google.com/search?q=spri...w=1507&bih=923
    Last edited by greenie; Dec 27, 2020 at 04:16 AM.

  11. #7
    Supporting Member Crusty's Avatar
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    I've got mine converted to a QCTP so all I have to do is set the blade in a mount upside down and then it goes right on when I need it.

    Hey Dan, if you don't have a tangential (diamond) tool holder you should look into buying or making one. I'm truly stunned by how well the one I just made cuts and the finish on aluminum and steel is the best I've ever seen from my lathe. I think a fella could upgrade from a collection of carbide tools with a few TTHs and be out of the insert buying market to boot.
    If you can't make it precise make it adjustable.

  12. #8
    Supporting Member celsoari's Avatar
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    Quote Originally Posted by Crusty View Post
    I've just almost finished my tangential tool holder that's similar to your version. Actually it's cutting beautifully and I'm waiting for some black oxide solution to surface treat it before posting it here. Maybe one of those cutoff tool holders is next, but for now I'm loving making chips with my new tool holder. I'd heard that they were good but I didn't have a clue that they were this good and I've never made a chip before that was 3' long. Thanks for the inspiration.

    Click image for larger version. 

Name:	First cuts.jpg 
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    First cut
    (no file work)
    I thank you for your participation Crusty friend

  13. #9
    Supporting Member celsoari's Avatar
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    Quote Originally Posted by greenie View Post
    So what's so new about that design for the parting tool, it was invented when Christ was an ankle-biter, it's been around for more than a century.

    A simple google brings up quite a few of the exact same design.

    https://www.google.com/search?q=spri...w=1507&bih=923

    Amazon were even selling this type of parting-off tool.

    https://www.google.com/search?q=spri...w=1507&bih=923
    Yes, it was used a lot in the past, but I don't know why it stopped being used in workshops.
    This type of tool is essential in my workshop

  14. #10
    Supporting Member Crusty's Avatar
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    Let's see - it's a tool (check) and it's home made (check), so it meets the fundamental tenet here and therefore is appropriate here.



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    If you can't make it precise make it adjustable.

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