Vacuum casting…
System checks.
-
Is your sealing pad in good condition( high temp flat
silicone pad Usually red in color) -
are you drawing at least 28" mercury on your Vac gauge
before putting a flask on the Pad( to test… put your finger
over the hole or a piece of silicone rubber to seal the vac
hole. -
If you are using perforated flasks… make sure the flask
flange is absolutely flat and both sealing surfaces are clean. -
if you are using standard (non perforated ) flasks… have
you on occasion used a wide belt sander on the flask to make
sure that the sealing surface of the can is perfectly flat.This
is NECCESSARY. -
if you are using a standard flask, you can greatly increase
your vacuum casting suction by using the tyvac perforated flask
liner… Available from http://contenti.com/products.htm
and also from http://www.gesswein.com/ This will allow you to
cast at lower temperatures and get better fills. I hope this
helps some people who are having problems
Daniel Grandi
http://www.racecarjewelry.com