Geometric Chuck

Overview


2 Stage Geometric Chuck by Ibbetson

A Geometric Chuck (sometimes called an Epicycloidal Chuck) is used for cutting patterns made up of rolling centres.

Just getting started? : You can definitely delay getting one of these.


Geometric Chuck
Image courtesy of Skinner, Inc. www.skinnerinc.com

Additional pictures of this device

Newer Geometric Chuck

     
5 Stage Geometric Chuck by Plant

Examples of this device in use


Leinhard Rose Geometric Chuck

This is a YouTube video from Chuck Bommarito (aka, outsidescrewball) showing a Leinhard Rose Geometric Chuck in use. The video is a bit long, but does show the chuck well, as well as a piece made on it.

This video shows an Ibbetson Geometric Chuck on a Holtzapffel rose engine lathe.


How it works

Basically, it is achieved by rolling one object around another, forming a composite of two perfectly circular motions. The geometric mathematics behind this chuck's movement are explained by Dr. Frank Farris in his 1996 paper, "Wheels on Wheels on Wheels-Surprising Symmetry". There is also a nice article on this at Wolfram MathWorld.

Frank Dorion gave this lecture on the design and functions of a geometric chuck. He also built an oversized wooden model of one, helping to explain it's function. This is one of the best overviews presented to date.


More Information


About this site
Disclaimer : eMail comments to me at OTBookOfKnowledge @ Gmail.com. The process of woodturning involves the use of tools, machinery and materials which could cause injury or be a health hazard unless proper precautions are taken, including the wearing of appropriate protective equipment.