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  #11  
Old 01-10-2013, 08:56 AM
rcrawford rcrawford is offline
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I might have been wrong about that. When I talked to the people at Phase-a-matic that was what they told me. Last night I started looking up different VFDs and they make no mention of that.

Here is one that says it gives full power, and is made specifically for pumps (which are basically the same as rotary vane vacuums as far as power requirements go).
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  #12  
Old 01-10-2013, 09:38 AM
de5 de5 is offline
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Thanks for the link Denny. These pumps look good. Have you found a site that lists side by side price comparisons of the different sizes?
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  #13  
Old 01-10-2013, 11:04 AM
Denny J Denny J is offline
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Quote:
Originally Posted by de5 View Post
Thanks for the link Denny. These pumps look good. Have you found a site that lists side by side price comparisons of the different sizes?
There are a lot of different places that sell these and probably it would be the best to google dairy pumps in your zip code and find a local place and I am not sure how much prices vary from retailer to retailer but what I found was a 10HP lobe style pump will run in the 2300 dollar range and the motor in the 600 dollar range new. That would get you a 10HP setup brand new for under 3 grand. You can get them rebuilt for the 1700 dollar range and a used motor maybe 300 so realistically you could get a warranted setup for a few thousand. If you found a used one then even less. That seems to be a fair price for a vacuum pump.
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  #14  
Old 01-10-2013, 11:13 AM
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james mcgrew james mcgrew is offline
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not to sure about the use of a dairy vac,, as a farmer you are talking about some vac spread out over a large use and probably regulated down a bit,, (don't want to get to humorous about is purpose!!) with a hold down vac you need vac and cfms it is the mixture of that that makes it work,, even though a vac has high pull (29") it may not have enough cfms to make it hold a sheet.

large dentist offices for example use strong vacs but light cfms, medical vacs will not work for us
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  #15  
Old 01-10-2013, 11:15 AM
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this will not work on a cnc

http://www.farmandranchdepot.com/far...ilking-Setups/
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  #16  
Old 01-10-2013, 11:55 AM
de5 de5 is offline
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Quote:
Originally Posted by james mcgrew View Post
Those pumps aren't at all what he's recommending.
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  #17  
Old 01-10-2013, 12:18 PM
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james mcgrew james mcgrew is offline
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I sorta realize that just wanted to clarify, what other vac pumps would be used in a dairy situation?

also there has to be a reason it would not work for a cnc, otherwise it would be widely discussed as this is a large $$$$$ part of the cabinetmaking/nesting equasion... I have 5 hp 10 hp and now a 15 hp regen
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  #18  
Old 01-10-2013, 01:28 PM
Denny J Denny J is offline
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Quote:
Originally Posted by james mcgrew View Post
I sorta realize that just wanted to clarify, what other vac pumps would be used in a dairy situation?

also there has to be a reason it would not work for a cnc, otherwise it would be widely discussed as this is a large $$$$$ part of the cabinetmaking/nesting equasion... I have 5 hp 10 hp and now a 15 hp regen

Jim

I know where you are coming from and that is the part that I am looking at closely. Basically you need a pump that gives out a minimum of 15hg mercury and in the ballpark of 275-300cfm of volume to be on par with a 10hp regenerative blower. As long as a pump can do that it won't really matter if it is a lobe, a vane or a roots type. Going to do some more checking and get some more info.

One thing to remember is that the CNC industry is fairly new compared to the dairy industry and a lot smaller. So there are more than likely some things that we can learn from them as the vacuum system is the heart of their industry and it is such a big part of the cost of running their parlors.
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  #19  
Old 01-10-2013, 01:45 PM
darde darde is offline
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Could you run a smaller pump and have a vacumn switch that turns on a shopvac if the pressure drops so you could keep your cfm higher. If it only runs at the end of the sheet cutting it may be more economical if a 5hp vacumn pump is doing most of the work and the shop vac only runs when it needs to?
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  #20  
Old 01-10-2013, 01:59 PM
rcrawford rcrawford is offline
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As soon as you turn on a shop vac, the pressure drops to about 3-4"hg (has higher flow, but low pressure and the excess pressure from the stronger vac source 'leaks' back through the shop vac).

The specs on those dairy pumps were listed in that link. You'd need a 30hp pump to get the cfm at a range that would work for a spoilboard. But if you were using gaskets on your spoilboard, or fixtures, a 10hp dairy pump with a VFD would be a good set-up. But if you are using fixtures, a good venturi vacuum is only around $120 and will provide 25"hg with a good seal.

I have a 4hp dental vac set up, but it requires about 2 gallons of water flowing through it per minute. It has only 60cfm max, and it will get to 20"hg. But it will only maintain 15"hg at around 5-10cfm. Dentists regulate it down to 10"hg so it doesn't bruise oral tissue!
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