My freind says he can give a wax model to this guy at 10 oclock
Saturday moring and he will have it back in a perfect casting by 12
oclock noon the same day.... If anyone with any knowledge of
casting knows how to pour investment and burn out then pour within
a 2 hour time period.. please let me know.
Go to the Precious Metals West web site, at
On the list on the left of the home page, click the new products
link. Scroll down to the second product, their "supersonic"
2 hours may be a stretch, but they say they can do it in 3 hours
with that investment, and I’ll bet that with a small flask, and
perhaps pushing the times a bit, one could shorten it from there, too.
Remember that some of the new investments will tolerate both a
shorter setup time after pouring, and when set, can be put directly
into a 1500 degree kiln, greatly shortening the the burnout.
Heck, with small dental size flasks, and not a great success rate,
I’ve managed that on occasion with plain old satin cast investment,
using hotter water than specified in order to shorten setup time. Not
all flasks survive this, but I’ve managed it once or twice just to
see if it could work. About half the time it did, and I might have
been able to fine tune it to improve the results. I’d use warmer
water, and a fairly thick mix for strength, put in the kiln at a
half hour, with the kiln at 1500, but turn it down when the flask
went in. The kiln would have dropped to about 1350 to 1400 about the
time the flask got up to temp, and it would have about an hour to
burn out before I’d cast. These were very small flasks, barely big
enough for one ring, using a furnace tape liner to help with
expansion, and cast in a small dental centrifuge. The surfaces I got
were often rather on the rough side, but as I said, this was plain
satin cast investment, nothing special.
Bottom line, never say “never”.