Well my dear friend,
It is not very difficult to make a vacuum assist casting machine.
What you need is a very good oil rotary vaned high vaccum
pump,capacity minimum required is 100 liters per minute, or more but
not less, to remove air by vacuum of your bell Jar which should be
10 inches in diameter by 12 inches in height approximately. 12X12
inches of bell jar will need 300 liters per minute capacity of pump
to remove air with in one minute.
First you will have to take a mild steel sheet (plate) of 10 mm
thick, and 12 inches by 12 inches square or more according to your
bell jar diameter which will be used to remove air from your
investment slurry. you have to on your lathe,phase one side of this
plate perfectly flat, and make a 15mm hole in the center of this
Then weld a 3 inch diameter by four inch height pipe of steel under
this plate ( which is the top of your casting and investing table,
two in one,) below the hole in the center of the plate, but before
welding this pipe ( a steel flask of 3" X 4" can be bought ) weld a
half inch dia pipe or the size of the the flask(3x4) on which the
vacuum rubber pipe will fit, to the 3X4 inch flask at right angle in
the center of the flask, the flask’s open end will be closed with the
rubber base former of the 3 inch size, which you can buy at the
jewelery supply store,.this will ensure proper vacuum seal.
You will have to buy a silicone rubber sheet, four to five mm thick
of the size of this plate and make a 15 mm hole in the center of it,
this rubber sheet will ensure proper vacuum seal while casting and
This way your casting and investing table is ready, now you can weld
four bolts under this plate as legs of the required height
approximately one inch. this casting and investing table which is
ready is to be fitted on a metal or wooden box, which has a five inch
hole in the center of its top so that the 3x4 inch assembly under the
plate is accommodated inside this box ,whose size should be in
proportion of the your casting and investing table.
The flask you will use for this above casting machine will be solid,
you will have to use a perforated sheet of thin card board as liner
inside the flask. you can bye a 15 mm dia punch to make holes in a
sheet of thin card board and make a perforated sheet, to line your
solid flask, this flask will have to be filled approximately five mm
less, for the vacuum which will be applied form below the flask and
the seal is proper with the edge of the flask is clean of investment.
You have to connect the vacuum rubber pipe to the casting table you
have made. you will have to fit a vacuum release valve and a vacuum
gauge in between the vacuum rubber pipe.from vacuum pump to the
casting table. You can fit this vacuum release valve and the vacuum
gauge on the box of the casting table. make proper connections.and
check for the vaccum is not leaking from any joints.
Hope this will be of your help.
Many more suggestions like this will be on your way form my many
Orchidian Friends to guide you to success of your vacuum casting
Best of luck.
May all be free from all difficulties.
May all be free form ill will, hatred, animosity, anger.
May all generate good will, love, peace and harmony.
May all be happy and healthy and liberated.
Strive to be Happy