Re: [ATM] Big Ol' Grinding Machines

["Stuart Hutchins" <stuart452@earthlink.net>]

Mark,  Thanks for the quick response. That is valuable information.  The
only technical point of reference I have on machine grinding/polishing is
the Mirror-o-Matic design by Dennis Rech.  He uses 1/4 to 1/3 horsepower ac
motor and I believe he turns a 20 inch table on a 1 inch shaft.  I can back
the torques out of that data.

By "off center forces" do you mean the overhang moments on shaft or
bearings?

In polishing/figuring what is the force required to push a 16 inch lap?  My
experience stops at 8 inches, and I never measured the drag.

Stuart

----- Original Message ----- 
From: "Mark Cowan" <toolontop@yahoo.com>
To: "Stuart Hutchins" <stuart452@earthlink.net>
Cc: <atm@atmlist.net>
Sent: Saturday, May 22, 2004 6:00 PM
Subject: Re: [ATM] Big Ol' Grinding Machines


> Stuart:
>
> Ask yourself, do you feel lucky?
>
> Consider that the polishing work scales with the area
> of the tool, and /that/ scales with the square of the
> mirror radius.  6:16 is 7 times, 8:18 is 5 times - do
> the parts look like they're overbuilt 10 times for
> strength?  And that's not addressing off-center
> forces, which is what will kill your machine...
>
> Cheers,
> Mark Cowan
> Salem, OR
>
>
>
> --- Stuart Hutchins <stuart452@earthlink.net> wrote:
> > Grrr,
> >
> > If one has access to a multi station, used,
> > commercial mirror grinding
> > machine, does it make any sense to use parts like
> > spindles and arms to build
> > individual machines.?  Or is it easier to just start
> > from scratch.
> >
> > Are the spindles and arms from a 6 or 8 inch
> > capacity turntable likely to be
> > beefy enough to use for 16 or 18 inch mirrors? (Yes,
> > of course the center
> > distance and arm length would have to change)
> >
> > Stuart
> >
> >
> > _______________________________________________
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>
>
>
>
>
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