Cleaning Up
Before going to fine grinding, or before going
from any grade to a finer one, a thorough cleaning up should take place, so that there will be no possibility for a coarser grade to get near the mirror again. Otherwise, a grain or two of a coarser grade may find its way between the disks and chip wide swaths in the surface of the mirror.
And, when polishing, even the finest grain of carbo on the lap will cause unsightly scratches.
The bench top, water bottle, spoon, template, flashlight, water
pail, apron, and anything on which loose abrasive may lie should
be dusted, wiped, or flushed. It is not necessary to remove every
last carbo grain from the water pail each time it is flushed out.
Well-behaved grains will remain at the bottom where they can do
no harm. Flush the handle and rim, however, and keep clean water
in the pail.
A skilled worker, abrasive-conscious and familiar with the
routine, can bring a mirror through to the polishing stage without
leaving his bench, save for checking the curve, pausing only long
enough to change papers and to flush his hands and the disks. If
you have not contaminated anything with carbo, no time need later
be lost in an elaborate cleaning up.
Fine Grinding
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