Each finial is made up of 5 components: finial base, finial
bottom, finial top, finial ball, and an eagle. Grand Light will create a
separate mold for the casting of each part. Shown below are three steps in the
first process of mold making, there are many steps to
each process and each is very time and labor intensive. There will be days of individual steps for each step of the
entire process, until pouring day and that day is a one shot deal, you either
yield a good casting or start all over. That is why this process is so
intensive because each step is critical to yield a good casting.
The molds are cast in rubber and split to pull off the original piece. Then the
molds are put back together and filled with wax encapsulating the entire
component. The mold then moves to the "slurry room". An intensive
process of dipping and applying slurry (ceramic based mixture) in a temperature
and humidly controlled environment will began. This process will take several
days to complete as the slurry has to completely cure out and dry before
applying the next coat. This process continues until the slurry walls have a
consistent thickness and is strong enough to hold together under the pressure
of 2300 degree bronze. The slurry form is then supported by applying wax
(structural) rods to hold the voids open and support the ceramic shell in every
area to keep the mold from collapsing during the pour. Once the rods are in
place and the ceramic shell is completely cured out the mold is ready to pour.
They will get each piece of this assembly in a cured state of slurry and pour
all of them at one time using one heat of the furnace.
U.S. Gov't C.C.R. registered company.
