our vacuum pump shot craps today, and the molds were in the
oven buring out we do a all night burn out, will they be alright to
Rick, I understand that you can “Hold” a flask for quite some time
at heat. I know that some years back, I was taking a class at the
local state college, and the instructor mentioned that he would put
a weeks worth of flask in the oven at once and then as a students
class came up, it was ready for them to cast.
For a repair for your vacuum pump, try Graingers. They have a
refrigeration repair pump that is an exact replacement for the vane
pumps is some of the casting machines. They usually have one in
stock in the larger cities. The price is much less than you will
find if you go to Rio or the other tools distributors, and you can
get it quicker.
also how reliable is steam casting?? i.e potato thanks Rick
I wouldn’t try it for something I really needed. The flask needs to
be sprued differently . IE many small sprues vs a large one so that
the melt will stay in the sprue button until the steam is applied.
If you have a 1/4" sprue from the button, the melted metal will run
down and cool prior to applying the steam. You need many small,
1/16" or so spures from the button so the surface tension holds all
of the metal in the button until the steam is applied. One more
point, your sprue button needs to be big enough to hold all of the
cast and some for the button, as you use the button to melt the
metal. I guess that this means that if you invested a piece for
vacuum casting, it wouldn’t work for steam casting.