My own vacuunm chamber for degasing

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My own vacuunm chamber for degasing

Postby Pinselknecht » Sat Feb 01, 2014 7:49 pm

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.

Image

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
Your onlineshop for miniature hobby: http://www.pk-pro.de
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Re: My own vacuunm chamber for degasing

Postby Fleafa » Mon Feb 03, 2014 7:35 pm

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!
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Re: My own vacuunm chamber for degasing

Postby mangozac » Mon Feb 03, 2014 8:32 pm

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 ;)
Oh yeah I can make that....
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Re: My own vacuunm chamber for degasing

Postby Islacrusez » Mon Feb 03, 2014 9:13 pm

Correct me if my math is wrong, but shouldn't a 3.5 CFM clear a 10L pot in about 6 seconds?
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Re: My own vacuunm chamber for degasing

Postby Fleafa » Mon Feb 03, 2014 10:29 pm

Your maths has to be wrong! My 3.5 CFM certainly didn't manage that!
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Re: My own vacuunm chamber for degasing

Postby Deadmeat30 » Tue Feb 04, 2014 3:30 am

my 12CFM pump degasses in around 6 seconds. My old 3.5 used to be nearer 25-30 seconds
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Re: My own vacuunm chamber for degasing

Postby Pinselknecht » Tue Feb 04, 2014 6:59 am

Hey, it is a 8 cbf pump! There must be a mistake in my description ;)
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Re: My own vacuunm chamber for degasing

Postby mangozac » Tue Feb 04, 2014 7:47 am

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

You maths is very wrong ;)

3CFM will theoretically take about a minute (and in practice will be longer).

Pinselknecht wrote:Hey, it is a 8 cbf pump! There must be a mistake in my description ;)

Yes, there is! Lucky we spotted it for you! 8CFM will be excellent and evacuate the chamber in under 25 seconds.
Oh yeah I can make that....
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Re: My own vacuunm chamber for degasing

Postby Islacrusez » Tue Feb 04, 2014 9:00 am

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?
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Re: My own vacuunm chamber for degasing

Postby mangozac » Tue Feb 04, 2014 11:14 am

You can read about it here: http://www.resinaddict.com/forum/viewtopic.php?f=8&t=593

Basically, yes, the deeper the vacuum becomes, the slower it is to vacuum. The calculation involves a natural logarithm.
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Re: My own vacuunm chamber for degasing

Postby Fleafa » Tue Feb 04, 2014 7:14 pm

Pinselknecht wrote:Hey, it is a 8 cbf pump! There must be a mistake in my description ;)


Then that is a great kit! The pump, if the same WilTec one as mine, is a beast :)
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