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| USING FORM BOXES |
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| Metal |
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| The metal for a vessel should be a minimum
of 18 gauge and a maximum of 14 gauge. Start with plain,
non-patterned sheet. Any embellishment will be removed
during the forming process. Also, the pattern will cause
the metal to be thinner in certain areas and will tend
to break much faster. Recommended metals are copper, brass,
and silver. Copper is the most forgiving and the easiest
worked, and should be used for trial pressings until you
gain familiarity with the process. Brass generally is
more difficult to use because of the differences in alloys,
with significant variations from one run to another. These
alloys may not anneal readily and some tend to work harden
very quickly, resulting in tearing the metal during forming.
"New Gold" seems to offer the best formability of the
brasses. Sterling silver works well, but must be worked
in small steps and annealed more often to achieve large
volumes. Fine silver will work faster and easier, but
the final piece is more prone to damage if hit or dropped.
In any case, the basic size of the metal must fit the
size of the box and go completely to the walls. This is
to prevent the metal from forming a "ridge" that would
tend to act as a "grabber" for the urethane, preventing
its free movement. |
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