ATM Re: Spindle/eccen ratio -- was Slitless tester?

[btk@pacbell.net]

Clint Bach wrote:
> With the slitless tester the source and
> knife edge MUST move together.  Is this correct?

Yes


> BTW, I'm almost finished with a new Eldgin triangle type mirror 
>grinder. The 36 RPM and 7.5 RPM speeds are from actual
> no load measurements.
> 
>
> 
> Clint


Clint:

In a post several months ago (in the archives) Bob Pfaff stated his 
recconmendatins on 5/1 ratio of spindle to eccentric for polishing...

Grinding is not as critical, but you WILL want to polish on this machine 
sooner or later, so bring up Bob's post from the archives, and go through 
it.  I have repeatedly followed this proceedure with TOT, and a specific 
stroke, to get wonderful spheres off my Strausbaugh polisher.  On an old 
Elgin at the Chabot College Mirror Workshop, we don't get quite as good 
of a sphere, but with 15min of hand work, you can be off and 
parabolizing..

FWIW

Bill Marriott
Woodacre, Ca. USA
btk@pacbell.net

http://www.starlightoptical.com
telescope/optical projects

and now, P1800 Volvos
http://www.starlightoptical.com/volvos.htm