Patterns for casting an airplane stick grip.
Shows the production pattern, including pouring
basin mounted on the cope, and runners on the drag.
 The aluminum shell core boxes are shown
with a plastic test part poured to prove the tooling.
The actual cores are made of a resin bond sand blown
into the core boxes, which are heated by gas flame
when mounted in the shell core machine.  The sand is
blown in, and the mould held closed under the heat
for a timed period that determines the thickness of the
shell wall as the resin sets.  The machine then opens,
the core is removed, and the loose sand dumped out,
leaving a strong core, that will easily crush after
it is "overheated" by the molten metal, so that it can
accomodate the shrinkage of the metal as it cools and 
solidifies.  pictures of plastic test "moulds" with the 
test core in place to check that the parts will mate 
without casuing crushing or other damage when the sand
moulds are made.  Last photos of the finished product,
"regular" and "deluxe" (with wood inlay) versions.
Can be bored for sticks from 7/8" through 1-1/8"