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Originally Posted by
stumpdigger
Drink a milkshake from one straw, you can't get anything out due to pressure drop. Put 2 straws in your milkshake and now you can drink it.
If I cant get anything with one straw, I use a spoon.
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Originally Posted by
R600a
Where are those made? I've been thinking about getting a little vacuum pump just because I like to see people's faces when they don't think the tool you have is capable of the job and then it does better than theirs. I just don't want to get some Chinese piece of junk.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
This pump is sweet as can be, even an old cripple can get it up a ladder, think it only uses 6 oz. of oil so not for nasty contaminated systems. Sounds small at 1.58 cfm but I grew up with pumps smaller than that. I think it came from e-bay, i'll see if i can find one for you.
" The more I learn the more I realize how much I don't know"
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Originally Posted by
stumpdigger
This pump is sweet as can be, even an old cripple can get it up a ladder, think it only uses 6 oz. of oil so not for nasty contaminated systems. Sounds small at 1.58 cfm but I grew up with pumps smaller than that. I think it came from e-bay, i'll see if i can find one for you.
I found them I just can't figure out where they're made. I try hard to buy from countries other than china.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
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Originally Posted by
m singer
Your observation is both intuitive, logical and understandable on the surface.
Thanks. It's the deeper understanding that I would like to get.
Originally Posted by
m singer
Nevertheless this debate has been beaten to death with testing both on the bench and in the field. The result being that 1/4" hoses are an impediment to pulling an industry standard evacuation in a reasonable amount of time. Larger hoses speed the processes greatly. Any restriction that can be removed will help.
Search YouTube for better explanations/demonstrations by Jim Bergman or Bryan Orr at the HVAC School.
Seen a lot of their stuff, didn't notice that one. Gonna look for it now.
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Originally Posted by
Zamoramax
It's simple. Drink a soda out of a 12" straw. Normal right? Now put 6 of them together and try it again. Much more restrictive. You gotta work for that drink.
Been a while since I had a go at a Krazy-straw. Wasn't that hard when I was a kid, I'm assuming my little mouth was pulling too little "CFM" to gain from a larger hose.
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Originally Posted by
R600a
That are just compare a milkshake straw with a coffee stirer.
Originally Posted by
stumpdigger
Drink a milkshake from one straw, you can't get anything out due to pressure drop. Put 2 straws in your milkshake and now you can drink it.
Think this will work with beer too? I would probably be willing to give it a shot, you know for science, of course. 
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Originally Posted by
R600a
I found them I just can't figure out where they're made. I try hard to buy from countries other than china.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
They can be found on Ebay, I had to open a link for dental/ medical vacuum pump to find what I have or very similar at their store. They manufacture a lot of industrial stuff, I don't think it's from China, works too well. Can't beat the price, size, and weight. It will pay for itself in oil changes. The one I saw was a little bigger than mine @ 1.8cfm, 25 microns, 1/4HP. One of the nicest pumps I've ever used
" The more I learn the more I realize how much I don't know"
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Originally Posted by
stumpdigger
They can be found on Ebay, I had to open a link for dental/ medical vacuum pump to find what I have or very similar at their store. They manufacture a lot of industrial stuff, I don't think it's from China, works too well. Can't beat the price, size, and weight. It will pay for itself in oil changes. The one I saw was a little bigger than mine @ 1.8cfm, 25 microns, 1/4HP. One of the nicest pumps I've ever used
All I could find was rated for 40 microns and the company was very careful to not state that they manufacture anything. They mentioned design and distribution but not manufacturing so I'm still trying to figure out where they're made. It looks like I can actually buy them directly from the company though.
For the price I'll probably order one and find out when it comes in.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
-
Originally Posted by
R600a
All I could find was rated for 40 microns and the company was very careful to not state that they manufacture anything. They mentioned design and distribution but not manufacturing so I'm still trying to figure out where they're made. It looks like I can actually buy them directly from the company though.
For the price I'll probably order one and find out when it comes in.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
As to manufacture, hard to say. That 2cfm pump if you chase it down is 1.8cfm with ultimate vacuum at 25 microns. Champagne Il is the home of University of IL, huge place for math, science, physics, ect. Hard to get in unless you are in the top 5% of the nation. I would not be surprised in the least if VIOT was a start up company of grad students. whether they just design stuff and/or made it on/in school property machine shop IDK, but it is definitely high grade equipment wherever it's made.
" The more I learn the more I realize how much I don't know"
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Post Likes - 1 Likes, 0 Dislikes
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Originally Posted by
stumpdigger
As to manufacture, hard to say. That 2cfm pump if you chase it down is 1.8cfm with ultimate vacuum at 25 microns. Champagne Il is the home of University of IL, huge place for math, science, physics, ect. Hard to get in unless you are in the top 5% of the nation. I would not be surprised in the least if VIOT was a start up company of grad students. whether they just design stuff and/or made it on/in school property machine shop IDK, but it is definitely high grade equipment wherever it's made.
I will probably be buying one at some point.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
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Originally Posted by
R600a
I will probably be buying one at some point.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
I doubt that you will have any regrets.
I've got a machinist buddy that works in these high tech Universities helping students: understand machining, build projects, make prototypes, ect. I think he is at a UofI extension in Chicago now building projects to spec, no student involvement, just cranking out prototypes.
" The more I learn the more I realize how much I don't know"
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I got a 1.35 cfm that pulls into single digits. It fits in the bottom of a 5 gallon bucket with hoses and whatnot. No way I'd want to use it for everyday things. No way for service.
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Vacuum Pumps
Using a 6 cfm pump and a gauge manifold set that has a 3/8 port on it will really speed up your evacuation times.
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Originally Posted by
itsiceman
I got a 1.35 cfm that pulls into single digits. It fits in the bottom of a 5 gallon bucket with hoses and whatnot. No way I'd want to use it for everyday things. No way for service.
Do you want to sell it? 
Or at least post the brand and model?
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
-
Refco RL-2
I don't recommend it for service work or high ambient.
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Originally Posted by
itsiceman
Refco RL-2
I don't recommend it for service work or high ambient.
It even has a smiley face.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
-
It only takes 4 oz oil. 
I like it. And it is swiss so it goes together with my PB Swiss screwdrivers perfectly.
Sent from the Okie state usin Tapatalk
"Is this before or after you fired the parts cannon at it?" - senior tech
"Is this before or after you fired the parts cannon at it?" - senior tech
I'm tired of these mediocre "semi flammable" refrigerants. If we're going to do it let's do it right.
Unless we change direction we are likely to end up where we are going.
"It's not new, it's better than new!" Maru.
-
Originally Posted by
itsiceman
I got a 1.35 cfm that pulls into single digits. It fits in the bottom of a 5 gallon bucket with hoses and whatnot. No way I'd want to use it for everyday things. No way for service.
Well I'm probably 40 years behind the times but that's the way I prefer to do it.
" The more I learn the more I realize how much I don't know"
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I can tell you from experience that using the 3/8 port on the pump and a 3/8 hose takes a quarter of the time to pull a system down below 500 microns than using a standard 1/4" hose.
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You running that through your charging manifold?
Originally Posted by
Str8Texan
I can tell you from experience that using the 3/8 port on the pump and a 3/8 hose takes a quarter of the time to pull a system down below 500 microns than using a standard 1/4" hose.
I do a triple evac with nitro to remove non condensables.
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