Historical Ellipse Chuck
An Ellipse Chuck is similar to an eccentric chuck, but is used to make oval parts.
Wes Pilley made one and showed pictures along the way on his Instagram page. This is not a project that I would recommend for the weekend machinist.
John Edwards' web site, OrnamentalTurning.co.uk, really does a far better job explaining these devices than I could ever do, and there is also a lot of great information there that is worth reading. Understanding the historical devices really helps make one far better at understanding and using today's rose engines. The newer designs for devices like a spherical slide still draw much from what was done more than a hundred years ago. And this is why so many books that were written up to 200 years ago are referenced in the section, How to Get More Information.
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