People often find
cutting opalescent glass more difficult than transparent. My observation is
that people exert too much pressure in scoring opalescent glass by listening
for the creaking/scratching sound.
Not all glass is
made the same, even by the same manufacturer.
But all the same rules apply in scoring opalescent as transparent
glass. However, they sound different.
No more pressure
should be put on opalescent glass than transparent. Only about two kilograms (5 to 7 pounds) of pressure
is required to score glass sufficiently to create the weakness that we exploit
when running the score.
If you concentrate on
keeping the pressure on both types of glass the same, you will hear different
things. On transparent glass you normally
hear a creaking or light scratching sound and you do not get a whiteness along
the score line. If you hear same sound
on opalescent glass, too much pressure is being applied.
The same pressure (2
kilograms) on opalescent glass gives only a rumble of sound. No creaking
or scratching is heard. You can test
this by placing a piece of glass on kitchen scales. Zero the scales with the transparent
glass on it and score. Note the pressure you used. Now zero the scales with a piece of
opalescent glass on it. Ensure you score to the same pressure as on the
transparent glass by looking at the readout on the scales.
Just as excessive
pressure on transparent glass leads to erratic breaking of the glass, so it does
on opalescent glass. You will need some
practice to stop listening for a sound and begin to feel the pressure you are
applying to the glass. Once you do apply the same pressure to opalescent as to
transparent glass, your success in scoring and breaking opalescent glass will
increase greatly.
Scoring and breaking
opalescent glass successfully is the same for both transparent and opalescent
glass. Use moderate pressure and don’t
listen for the sound.
Feel the pressure.
Ignore the sound.
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