Here is the result of my recent experimenting
with lathe macros (cubic_spline).

One macro generates the basic 2D lathe co-ordinates
(as in my postings to this news group 23. May 
and 25. May).

And then some other macros I made recalculates
these co-ordinates for further "twists" and does
all the necessary cuts, "tilts" and translations.

I believe that the re-calculated lathe co-ordinates 
can also be used and for prism shapes connected
to such lathe shapes. (I have not done this yet.)


Any comments or suggestions ?


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html


Btw: This twisted lathe has a "minor radius" 
defined by this function:

2/3*cos(4*Phi) - 1/3*sin(6*Phi - pi/2)

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