a nutshell, this is how we make sculpture and fine
jewelry. The “lost wax” casting process,
goes something like this:
a model sculpted of clay,
metal or wax, Malcolm creates
a mold for reproduction.
Molten wax is injected
into the mold and allowed
to cool, leaving a wax
pattern, which is checked
for detail and completeness.
wax pattern is “tree'ed up,” or attached
to a base using additional wax for hold and support.
A stainless steel flask (like an open tin can, or
tube) is placed around the wax parts.
mix and pour “investment” (plaster, with
material suited to take extreme heat) over the wax
parts in the flask. The contents are then vacuumed
in a chamber to release the air bubbles. Once set,
the flask base is removed, leaving only the investment,
and the wax patterns suspended in the investment,
inside the flask.
drying the investment for 2-4 hours, we slowly “burn
out” the flask in an oven overnight, at temperatures
reaching 1300 degrees F, eliminating the remaining
wax. With the flask temperature reduced to 900 plus
degrees F for casting, Bronze, Silver or Gold metal
is melted in a crucible. At just the right moment,
the metal is cast into the flask, filling the space
left from the burned out wax pattern.
the metal casting is broken out of the flask using
a waterjet tool, the cast parts are cutoff from the
metal tree, sandblasted, and prepared for finishing.
is “deburring,” or grinding and sanding,
followed by polishing, or when flat surfaces are involved,
of Gold or other metals follows if the job requires,
then final assembly, setting of stones, mounting to
base, and voila.
as 1, 2, 3....4, 5, 6, 7, 8, 9, 10, 11, 12.