My own vacuunm chamber for degasing

[Pinselknecht]

Hey Folks,

I know this is not realy a casting project, but it is for a casting project!
I designed my own PK-PRO vacuum chamber. To be honest, it is not realy new to all of you, but I made some slightly differences to the common chambers.



1. I am using a industrial quality silicone rubber sealing.
2. All metal parts are made in Germany and assambled by me.
3. you have a quick connection for the hose so you can disconnect the hose while leaving the lid on top of the pot (I need that cause I am using 3 chambers at ones!)
4. a metal reinforced hose which takes any vacuum (industrial standard)
5. shok resistent valves
6. high quality shock resistent acrylic lid

I created this chamber 6 years ago for my own use. Then I build it for differend customers till I started to sell them online now!

And you can find it here: http://www.pk-pro.de/index.php?a=4834

Greetings

PK

[Fleafa]

I just bought the 8 CFM version of that pump to replace my 3.5 CFM. I think 3 CFM may be a little underpowered but that looks like a nice kit!

[mangozac]

My thoughts were the same as Fleafa's. 3CFM does sound a little low for a 10L pot?

I've moved this thread to the Marketplace as I think that will be a better spot

[Islacrusez]

Correct me if my math is wrong, but shouldn't a 3.5 CFM clear a 10L pot in about 6 seconds?

[Fleafa]

Your maths has to be wrong! My 3.5 CFM certainly didn't manage that!

[Deadmeat30]

my 12CFM pump degasses in around 6 seconds. My old 3.5 used to be nearer 25-30 seconds

[Pinselknecht]

Hey, it is a 8 cbf pump! There must be a mistake in my description

[mangozac]

[Islacrusez]

So what is the math? Will a 3.5 cfm pump only pump 3.5 cfm if both sides of the pump are at 1 atm, and performance drops as pressure decreases? In short, why is it that a 3.5 cfm pump will take 1 minute to clear 0.35 cu feet?

[mangozac]

You can read about it here:

Basically, yes, the deeper the vacuum becomes, the slower it is to vacuum. The calculation involves a natural logarithm.

[Fleafa]