Pauline, this is not an answer to your electricity problem per se. I
have an Aqua Vac Invester - Caster. I bought it used from a guy who
used to own a jewelry/rock shop. He said it could be plumbed into
your waterline. Mine has a little self priming water pump run by a
1/2 HP motor so it uses electricity. I have a 5 gallon bucket with
water and antifreeze. The unit pumps out of the bucket and drains
right back into it so I run off the same 5 gallons and does not
create a water bill.
I borrowed an electric vacuum pump from a refrigeration supply house
for work. It ran off electricity and used vacuum oil. You were to
change the oil after each use. The oil is not cheep. The machine spit
oil in a thick mist in the air and all over the floor. We were
creating a vacuum to simulate 50,000 feet in altitude. The shop owner
said his pump needed an over haul. Against my better judgment the
boss decided to buy a new pump for our project beings we did reach
50,000 feet in altitude. Just as I thought the first time we ran the
pump and every time after the air in the room is filled with an oil
mist and an oil mess on the floor.
This is why I bought an Aqua Vac. It has worked for me on casting
silver. I have been having a problem casting a key chain in brass. I
do not think it is a problem with the caster. I have been told the
temp. span from liquid brass to solid brass is small. If any one has
a suggestion on how to get the brass to the bottom of the mold before
it gets solid I would appreciate it. It is an oval disc 1/2 inch by 1
1/4 inches. I am casting 1 at a time with a 1/2 to 1/4 inch spruce. I
heat the mold up to 1700 degrees.
Thanks for any help and I hope this helped you a little Pauline.
Grand Junction, CO.