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Thread: Polygonal turning attachment

  1. #1
    paulsabatiee's Avatar
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    Polygonal turning attachment


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    Last edited by Jon; Mar 14, 2023 at 01:27 PM.

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    albertq (Mar 9, 2024), Francis4344 (Mar 15, 2023), Little Rabbit (Mar 20, 2023), nova_robotics (Mar 14, 2023), Scotty1 (Apr 26, 2023), that_other_guy (Mar 18, 2023), thevillageinn (Mar 14, 2023), WmRMeyers (Mar 20, 2023)

  3. #2
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    nova_robotics's Tools
    WOAH! What's this now? Do you have a PTO on your lathe? I like it.

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    that's been around for a while. Very creative mind!

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    Supporting Member mklotz's Avatar
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    Quote Originally Posted by Nitrous View Post
    that's been around for a while. Very creative mind!
    Yes, but it's not a round anymore.
    ---
    Regards, Marv

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    Frank S (Mar 20, 2023)

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    Elizabeth Greene's Tools
    Today I've seen videos of a lathe turning flat sided polygons and another lathe turning ovals. I'm beginning to suspect witchcraft or other trickery. Who let a Fae write the second edition of "How to run a lathe"?

    Joking aside, it's a very clever bit of kit. If I could spend a day with it I'd crank out a pile of square and hex rotary broach dies. They are absurdly expensive to buy, and this makes it trivial to manufacture them. You could do them in a single setup if you had a form tool in the tailstock to dish the ends, then turn the side profiles, and an upside-down parting tool on the rear of the cross slide to pop them off.

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    Elizabeth Greene's Tools
    Does anyone know how the math works of determining what shape a given cutter and spindle gear ratio will make on a part? Is it just 3:1 to make a triangle? I don't understand the geometry.

  9. #7
    Supporting Member Saltfever's Avatar
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    Excellent explanation by Tony Foale here last year.



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    Last edited by Saltfever; Apr 26, 2023 at 07:51 PM.

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