On Tuesday, April 23, 2013 9:18:18 AM UTC-4, Jim Wilkins wrote:


There is a traditional clock part called a "fusee" which is similar to

the mandrel for winding a conical spring:

http://upload.wikimedia.org/wikipedi..._With_Cord.png

jsw

Hi,

Interestingly, a Fusee is a "thread" following a hyperbola, not just a tapered thread.
They are a bit more difficult to make.

I have written a program to CNC a Fusee on a lathe.
Quite surprised myself with that one.

--

PaulS