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Pressure over vaccum casting

on an other subject. I have a casting machine that has gon on the
fritz and is not working. it is called a tri-caster. it was
designed to be attached to both high(40psi)pressure and a vaccum at
the same time. for some reason the regulators have failed, so it
looks like when i get the time i’ll have to tear it all down and
see what is wrong. Howsum ever I am intregued by the consept and am
wandering if any other machines use this consept? it would seem
that by applying positive pressure above and pulling a vac around
the flask you would get a better casting results especially in thin
or fine areas. I would be intrested in hearing pros&cons of this