I’m thinking of making a vacuum chamber for forcing air out of home-made machining wax and resin casts while they are curing. Bob suggested a modified pressure cooker, although they are designed for the high pressure to be on the inside they are still fairly tough, and I’m not going to be operating at particularly high differences to regular air pressure. I found this:
http://is.gd/SOZbAH
Ideally I’d be able to control the temperature inside the unit to slow the rate of cooling and a pressure cooker would handle that.
Does anyone have a better idea before I buy a pressure cooker, or even an old pressure cooker they don’t want any more?
Will.
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I�m thinking of making a vacuum chamber for forcing air out of
home-made machining wax and resin casts while they are curing. Bob
suggested a modified pressure cooker, although they are designed for
the high pressure to be on the inside they are still fairly tough,
and I�m not going to be operating at particularly high differences to
regular air pressure. I found this:
I think you’ll have difficulty getting a pressure cooker to seal, the
seals are designed only to work when the pressure inside is higher than
outside.
Alan Burlison
Agreed…from my Mass spectrometry days the sealing of the vacuum chamber
is the hardest bit. It had to be very carefully machined although it does
depend on the amount of vacuum required…Numbers?
AlexOn 11 Dec 2013 08:50, “Alan Burlison” alan.burlison@gmail.com wrote:
On 11/12/2013 00:20, Will Jessop wrote:
I’m thinking of making a vacuum chamber for forcing air out of
home-made machining wax and resin casts while they are curing. Bob
suggested a modified pressure cooker, although they are designed for
the high pressure to be on the inside they are still fairly tough,
and I’m not going to be operating at particularly high differences to
regular air pressure. I found this:
I think you’ll have difficulty getting a pressure cooker to seal, the
seals are designed only to work when the pressure inside is higher than
outside.
–
Alan Burlison
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Agreed…from my Mass spectrometry days the sealing of the vacuum chamber is the hardest bit. It had to be very carefully machined although it does depend on the amount of vacuum required…Numbers?
No numbers yet, still researching.
Will.
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