Re: ATM Grinding Machine

[Bill Marriott <btk@pacbell.net>]

Bratislav Curcic wrote:
> 
> Bill Marriott wrote :
> 
> > In general, I think you'd like to reverse the ratios of speed
> > spindle/eccentric.
> 
> > and confirmed many times by myself, run an
> > eccentric speed of approz 1/12 times the spindle speed.
> 
> I'll second that. Some of the smoothest surfaces I've seen to come out
> of machine were on Barry Adcock's Elgin (his ratio is around 1/5). It
> seems that 'rotating' polishing action is a preferred way of doing it
> on the machine.
> 
> Bratislav

I actually stand corrected. The Bob Pfaff method was supposed to be 
1/5 the spindle speed as Bratislav states.
If your spindle is going 60RPM, which is what I usually run, then the
eccentric needs to be 12 rpm, which is where the 12 came from, just in
the wrong place

Thanks for fine tuning things there, Bratislav.

Bill