Re: [ATM] 20" FS Polishing machine, shafts, etc....

[William Marriott <bmarriott@pacbell.net>]

Hello everyone!

Thanks to all that responded to my inquirey about
polishing machine spindle shaft diameters.  It seems
that nowdays, to be a fully skilled ATM, machine
building is part of the skills one must master.  I
think I am going to make up cardboard replica of the
blank, over arms, eccentrics etc, so I can see how
they interact.

In the ideal world, I would like to have a stroke that
swings to the left and right as per a normal
Strasbaugh type machine, but with an additonal
eccentric to add back and forth, so as the tool swings
from left to right, the second eccentric produces a W
stroke by pulling the tool forward and backwardd. I
guess this is sort of like a Draper style machine with
added left to right swing.

I suspect that once I start playing with the cardboard
cutouts, I may find that I have to revise my ideas as
to what is really possible.  I may end up with just
standard two eccentics, with the second one adding a
bit of ovalness to the established stroke from the
first eccentric. 

I have been trying to find pictures of a polisher with
two eccentrics, so I can get some idea of where they
might be placed on the frame of the machine.  Not much
luck.  I did find a picture of GW Ritchey's polishing
machine for the 60" on Mt. Wilson.  Hmmmmmmm, too bad
it is crated away somewhere.

Thoughts on all this are always welcome

Bill Marriott

Guitars, Stars, and Volvo Cars.
Life is Good!
http://HagstromWorld.com
http://StarlightOptical.com
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