Hi All, Although Vacuum by venturi does work,I must mention that you
can only cast very small flasks with something like this and if you
were planning on investing (plaster)then, again, you can only do one
small flask at a time. If you were to use a larger venturi system,
it is possible to do slightly larger flasks one at a time, however,
the larger venturi's will use a lot of air. Lets assume you were
thinking about doing this... now total up your costs involved for
being able to invest and cast a small flask... Let's take a wild
guess at about $400 for your minibell jar, piping, valves( not
cheap), filter, trap, casting platform or chamber... assorted other
small items.... If your pretty handy and understand all the
mechanics involved , you may get it done for around $400.
The systems that are available from gesswein, contenti and a few
others that use mechanical vacuum pumps and will do investing of
more than one large flask and be able to cast any size flask costs
New about $750 + and can be had used from a number of different used
machinery dealers ( even the jewelry supply companies have used
ones) for anywhere from $250-- To about $400... definitely a better
deal than building a system that may not do all that you want to do.
In any case, Have fun , whichever way you go....
Daniel Grandi we do casting ,finishing, model work, molds, cnc
soldering,handpolishing and a lot of other things for people in the
trade. Please contact us off list at email@example.com