[Jewelry making - Article 00246] - [Orchid] Ideal vacuum pump specs

[jattrading]

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hello,

    ive been looking at some great photos of home made vacuum casting set
    ups,with the casting chamber made from a plumbers flange,& large
    metal pipe,& furnace from fire bricks with propane burner etc & i'm
    interested in giving one a go, but before i contemplate jumping in at
    the deep end i'd like to weigh up specs & likely costs, problems
    etc. i'm also going to get some casting books so i dont have to keep
    bothering people with basic questions. can anybody advise me on
    ideal vacuum pump specs (does it depend on the size of the casting
    chamber),& likely cost? is the power of the vacuum pump important?
    (ive seen fridge vacuum pumps used) also is a kiln a must have piece
    of equipment for vacuum casting? 

thanks in advance for any help
joel
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