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Re: [ATM] 20" FS Polishing machine, shafts, etc....
Hi, instead of trying to make the machine make left-right and forward and backward strokes where each stroke starts and stops which causes jerking and wastes energy, make one with a circular motion stroke, where by only the overarm would have to move,
my 2 cents
Peter
> Date: Mon, 29 Oct 2007 11:27:08 -0700> From: bmarriott@pacbell.net> To: atm@atmlist.net> Subject: Re: [ATM] 20" FS Polishing machine, shafts, etc....> > 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> _______________________________________________> ATM mailing list http://www.atmlist.net/
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