There
are a number of reasons that may cause the grinder to chip the glass
surface. Some of the things to check are:
Too
much pressure
It
may be that you are pressing the glass into the grinder head too
hard. The grinder head should do the work. Firm rather than hard
pressure should be applied. If the grinder slows, it is an
indication that far too much pressure is being applied.
Insufficient
water supply
There
may be too little water reaching the head to lubricate the diamonds
and keep the glass cool. If you are getting a white paste or a powder
on or near the glass, you need to increase the water supply.
Worn
or damaged grinder bit/head
Inspect
your bit carefully for smooth areas showing that the diamonds have
been worn away. Also look for dents, and other irregularities on the
surface, indicating that the bit is damaged. Any dents or smooth
places on the bit cause a vibration that is similar to a tiny hammer
tapping the edge of the glass.
Grit
size
It
is possible that you may be using too coarse a grit on the grinder
bit/head. The more coarse the grit is the larger the chips will be
taken off the edge surfaces. Smaller grits take smaller chips off
the edges, and so are less obvious.
New
bits
Examples of the range and grit differences in grinding bits |
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