Re: ATM Flattening pyrex tool

[Bruce Swayze <swayze@europa.com>]

At 01:12 PM 9/5/97 -0400, you wrote:
>I just purchased a few pyrex tools, still with pitch on them.  I intend on
using grinding mirrors from them.  How do I proceed?  Should I flatten the
convex curve first or just ignore it?  How does one flatten a tool?
>
>Peter Thomas

Once you chip off all the old pitch, you can flatten the blank on any large
hard flat surface using rough grit.  We use a large steel plate and #46/70
grit.  You could also use another blank, a slab of concrete, or even the
driveway.  Just be sure to bevel the edge so that you don't chip off hunks
of glass around the edge.

Clear skies!


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Bruce Swayze
swayze@europa.com
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