Re: ATM Is it heat from the palms that makes the blank sieze?

["Bob May" <bobmay@nethere.com>]

The mirror/tool on top should be rotating fairly often (I do 10deg. or more
per stroke pair) and this should even out the heat from the hands.
What also should be happening after the 80grit is that you use shorter
strokes than the hogging stroke so that you have a spherical surface rather
than the hyperbolic surface that hogging strokes produce.  Short rapid
strokes are what you should be doing and if you find an arrangement where
the two pieces are sticking at, you want to specifically work around the
problem, gradually working it out as that's a non-spherical shape to the
mirror or tool.
After the hogging out of the mirror, you should be spending your time making
things spherical rather than trying to get more curvature out of the glass.
Bob May
http://nav.to/bobmay
bobmay@nethere.com