FILENAMES:

C_urve.DXF

DESCRIPTION:

This is a CAD file related to manual curve cutting on a mill.
Posted by Errol Groff <errol.groff@pop.snet.net>. Errol 
provided the following description:

=================================================================
One method of cutting curves on the mill is by a series of 
incremental cuts which are controlled on the x and y axis.  
Sort of the poor mans CNC.  On the attacned illustration 
(C_urve.dxf) you can see an idea of how the technique works.

I usually us a .025 increment on the X axis  and of course the 
hypotenuse of the triangle is the same for each step.  So of 
position 2 is is .852 from the starting point 0 the by Pythagoream 
Theorem 

A squared + B squared = C squared
.852 squared + B squared = 1.705 squared
.7259 + B squared  = 2.907
B squared = 2.907 - .7259
B squared = 2.1811
B = 1.1768

This can be done by hand but using a spreadsheet is much quicker 
(once you develop the sheet) and less prone to errors.