Just got a vacuum chamber, now which pump? (kind of time sensitive)

[Icetigris]

I just bought this 3 gallon vacuum chamber here: Vacuum chamber VAC-IT PRO for degasing urethanes etc | eBay

And I'm looking at a 3.5 CFM pump (for which the ebay listing ends tonight) that has a max vacuum draw of 29"Hg. Does that seem like a reasonable pump for that chamber? I want to degas silicone rubber and resins and the like.

 

[Rebelscum]

I built a system for a friend that used a Robinair 15600 6 CFM Vacuum Pump, and it was speedy enough but I wouldn't have wanted a lower cfm. Having said that, it was a much larger tank.

It was about $270 on Amazon Prime.

Maybe somebody that has a 3.5cfm jump in about if it's plenty fast.

 

[Icetigris]

Someone slipped a bid in at the last moment so I didn't get the pump, but there are more where it came from. The vacuum chamber seller told me it would take about 2 minutes with a 3.5 CFM pump.

I was wondering, since I also want to do airbrushing, but would rather not have to buy 2 pumps, how powerful of a compressor would I need to buy to draw a hard vacuum with a venturi pump?

 

[exoray]

how powerful of a compressor would I need to buy to draw a hard vacuum with a venturi pump?

The more CFM at higher psi the better... I don't have the numbers off hand (they very well could be in an old post here) but with my small portable pancake air compressor I can pull a decent vacuum with the HF venturi but no where near as well as I can with my big v-twin air compressor... With the pancake compressor I can still get a decent pull down but it requires I close the tank and let the compressor charge up, pull down a little more, close the tank and let the compressor charge up and so on... It's a hassle but it can be done... Get vacuum pump it simply works better if you can budget it...

 

[gobler]

I built mine using a JB Platinum pump I bought off of fle-bay. Works like a champ. One thing to conceder, if you are degassing more small cups, or pints of silicone, or whatever get a smaller chamber for a quicker draw. Just a thought.


Sent from somewhere in space & time...

 

[Zombie Killer]

The more CFM at higher psi the better... I don't have the numbers off hand (they very well could be in an old post here) but with my small portable pancake air compressor I can pull a decent vacuum with the HF venturi but no where near as well as I can with my big v-twin air compressor... With the pancake compressor I can still get a decent pull down but it requires I close the tank and let the compressor charge up, pull down a little more, close the tank and let the compressor charge up and so on... It's a hassle but it can be done... Get vacuum pump it simply works better if you can budget it...

If you don't mind me asking where did you get the HF venturi? I have an 80gal comp so it would be nice to be able to use it rather then buy a dedicated vac pump.