Pitch Tester
Well, after lots of pitch frustration in my first year of mirror
making,
I took an evening or two and put together a very nice pitch tester.
The
weight is very close to 1 kg (Texereau's weight of choice) and I tried
to
make the point similar to his specs as well, though it it certainly not
exact.
The weight is attached to a piece of 1/2" square steel stock, and
the
end of the steel is drilled to accept a large nail that I ground the
point
on. It can slide up and down and lock the point at various
heights
to accommodate laps of different thickness. The dial indicator
measures
the fall of the mass quite accurately.
I'll include fall data for various laps when I get a chance. Now
here
are two pictures that demonstrate the motion of the weight and point -
in
the first photo the weight is all the way down, in the second I'm
lifting
it up.
