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Old 08-03-2009, 11:06 PM
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Home made supplied air?

Anybody ever try an old hlvp turbine for a supplied air pump? I have a Fuji that is maybe 12-15 years old that I don't use anymore for spraying.
I was thinking if I wired in a reostat to the turbine I could turn the flow down a bit with out it over heating the air, and then run it thru 100' of hose to cool it down and purchase a supplied air hood from Hobby Air or SAS.
I wonder if the hood setup comes with any sort of filter? Or would I have to buy one separate?
Any ideas or thoughts on this guys?
Pros?
Cons?

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Old 08-03-2009, 11:19 PM
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Moving this to the garage/tools section.
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Old 08-04-2009, 01:04 PM
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I think with any supplied air system the air should be filtered. Remember your breathing the supplied air! It won't matter where the turbine is some one close by can create a dust cloud and it could be sucked into the inlet.
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Old 08-07-2009, 12:37 AM
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The bigger the I.D. of the hose the easier it is to move air through it. So a 12 volt computer icu type fan can actuallly put enough positive pressure in a hose that you can draw air from if you use a check-valve type mask at the end

Of course use some common sence and if you don't have that just hold your breath..
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Old 08-07-2009, 06:26 AM
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Alarger I.D. hose is a very good way to go as it will lower the air pressure's required for supplying air. However you set it up you always want a flow of filtered air into the mask. You don't want to be sucking air in from the supply system.

As long as the supply air can keep the mask flushed out the any outside fumes can't get in, other wise you could suck in something you do not want to breathe into your lungs.
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Old 08-07-2009, 09:42 AM
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Two things to consider, well three actually, one is that you also want to filter the air AFTER it leaves the flow device because the air could very well be contaminated with particles of all kinds of crap from the motor/turbine, look it over good. Another thing to consider is that you need to make absolutely sure that there is no way the pressure could rise to more than a couple of PSI inside the hood or you could seriously hurt yourself. Third, if you overlook something or simply make a mistake with this thing you could very well kill yourself, you will be betting your very life that you have it right! An economy supplied air system does not cost all that much and when you subtract what you will have in a home made system it will not cost much at all, it would be quite cheap for the assurance and peace of mind it would bring when you are surrounded by those VERY toxic paint fumes.
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Old 08-07-2009, 01:58 PM
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Red glad you pointed that put about filtering the discharge of the air supply pump. If you look at SAS Safety systems you will find the pump has a intake filter to take care of the big stuff, and a very large discharge filter on the supplied air side.
The pump they use is a vane type and a large filter insures the air is very clean.
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Old 08-07-2009, 02:04 PM
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I made one years ago, and it works perfectly !!
I used a Gast vacuum pump, which BTW is exactly what the high-end fresh air systems use. The pumps were made by the thousands, and can be picked up for next to nothing.
The vanes inside are made from ceramic, so there's no oil anywhere in the system. I plumbed the the vacuum side through some 3/4 black and mounted the intake outside, so that the air going in is fresh and cool. I also put a small filter on it to keep bugs and/or bird crap out.
There's also a filter at the pump in case anything gets by.
On the outlet side of the pump, I run a 3/8 hose parallel to my pressure hose that goes to my gun.
This hose then goes up to a modified half face mask.
If you're interested, I'll take some pictures and post them.
Dan

www.dantechfabricating.com

Here's a link to the same type of pump I used
http://cgi.ebay.com/Gast-Compressor-...d=p3286.c0.m14
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Old 08-07-2009, 03:05 PM
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Please do post some pictures. I have the SAS compressor, but a full face mask. Kind of hard to see with glasses on. Thanks.
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Old 08-07-2009, 03:26 PM
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Yes, pics please.

And if there's a significant difference in price between the homemade version and a comparable commercially-available version, I'd be interested in putting this in the wiki.
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Old 08-07-2009, 03:31 PM
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The SAS Safety unit for one person runs about $1000.
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Old 08-07-2009, 04:47 PM
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It cost me less than $100 to build mine.
I'll take some pictures and post them in a few hours.
Dan
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Old 08-07-2009, 05:33 PM
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OK ! Here's the pictures.


Pic 1- this is the air inlet in behind my shop. It's located just above and to the right of the window. it's actually a small silencer that's used for air tools, but I'm using it as a primary filter.

Pic 2- this is the vacuum pump located just outside my spray booth. the air is plumbed through black flexible water pipe. The filter was on the pump when I bought it. I only paid $50 for the pump !!

Pic 3- I added this picture to show that US Safety uses the exact same pump. They want well over $1000 for the pump !!

Pic 4 is a picture of my mask. I use a standard half face mask, but removed one of the filters. I machined an adaptor that screws in it's place so that I could attach the 3/8 surgical tubing. I wear the orange belt which has a canister with a couple of filters, but it's really not needed. At the end is a quick change standard foster fitting. I removed the one way valve so that there would be less restriction

Pic 5- this is my pressure regulator on the booth wall. The fitting to the right is the outlet for the fresh air which goes to my mask.


This setup has worked great without any problems for well over 12 years. Make sure you use 1/4 hp or higher. Smaller pump will not have enough air volume. If you have any questions, just PM me or send me a message at www.dantechfabricating.com
I

Dan
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Last edited by hemi43; 08-07-2009 at 05:38 PM.
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Old 08-07-2009, 05:47 PM
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I got my pump at a flea market for $20, the guy didn't know what he had. Same pump.
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Old 08-07-2009, 07:23 PM
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Everytime I see one cheap, I grab it !!
They are also great for vacuum bagging when making laminated parts.
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