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Re: [ATM] machine hogging

It took a month of evenings with 37 grit SiC, an 8" edge-on tile tool, and
25 pounds on the pin plus a bag of lead shot at the end of the overarm to
hog 0.4" sagitta on a 30" pyrex blank.
Weight helps a lot.

      Bill Prewitt
Webpage of telescope making and caving
        www.astrocaver.com
(my hobbies keep me in the dark)



> Weight may be the key, but with plate glass and 60? hmmm... No personal
> experience there.  I know Bill Prewitt used a barbell weight PLUS some
> additional to hog his 30....
>
> Ken
>
> Quoting Guy Brandenburg <gfbrandenburg@yahoo.com>:
>
> > I didn't get any responses when I asked whether it was
> > normal for 3 hours of machine grinding/hogging with a
> > cast iron gear and #60 grit to produce at MOST a
> > 0.002" depression on a 16.5" plate glass mirror blank.
> > The gear weighs about 5 pounds, I guess.
> >

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