Last edited by Jon; Mar 14, 2023 at 02:27 PM.
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)
WOAH! What's this now? Do you have a PTO on your lathe? I like it.
that's been around for a while. Very creative mind!
Yes, but it's not a round anymore.Originally Posted by Nitrous
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Regards, Marv
Experience is always far worse than pessimism
Frank S (Mar 20, 2023)
![](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.homemadetools.net%2Fforum%2Fshowthread.php%3Fp%3D220354%23post220354&media=https%3A%2F%2Fs3.amazonaws.com%2Fhmt-newsletter%2Fhmt_avatar_200.jpg&description=Polygonal Turning Attachment by Elizabeth Greene - 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. "Pin It")
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.
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.
Excellent explanation by Tony Foale here last year.
Last edited by Saltfever; Apr 26, 2023 at 08:51 PM.
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