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Yes,
but gravity is a large source of the pressure, the weight of the mirror and the
weight of the grinder (person or machine) pushing down on the mirror.
Assuming a full size tool and after you grind spherical with mirror on top, if
you were to put tool on top and continue with the same pattern of strokes, it
would flatten out and then turn spherical the other way. The glass on top
tends toward concave and the glass on bottom tends toward convex.
BALOGNA FEATHERS...
It's easy to tell when someone is theorizing without any practical
experience!
Gravity is a very very SMALL factor. Try grinding a deep curve in glass
without
putting any concentrated force on the blank, using gravity only.
You will grow old faster than the glass will grind!
ALSO...
If the tool is on top and the localized pressure of grinding is put on
the edge of
the tool, rather than the center, the mirror will go more concave. Where's
your
gravity theory now?
It's not the gravitational force which is constant doing the work, it's the
applied
force of the person or machine, localized in a specific AREA of interest,
that
makes the grit cut the glass.
Ken Hunter
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