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Discussion Starter #1
While looking around for a moderately inexpensive blaster i came across this video for one sold by Eastwood and it got me to thinking that i could make my own with some parts i already had here at the house.

Watch the fist video on the page;

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=13&cts=1331420862812&ved=0CKUBEBYwDA&url=http://diysodablasting.com/videos.php&ei=sN1bT_vsFIrg2AWW9-joDg&usg=AFQjCNFKfmi3zrzpDo1-sV7vpD_rYS7vJw&sig2=dtdRgb-TAFP24GV4UbJKuA

And here is my version.





I still need to rig up the siphon hose and figure out if i will need ah tip for it but i think it should work just as good as Eastwoods at least i hope so anyways lol.

A blast cabinet made from a heavy duty Rubbermaid storage container is also in the works but i haven't started on that yet.
 

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so how do you make it siphon? looks like it would just blow out both holes unless i am looking at it backwards.
 

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Discussion Starter #3
The air being forced past the lower hose barb creates a vacuum which siphons up the baking soda.

I got the hose today and did a water test and it pulled the water up the tube about 8 to 10 inches so i know its working so the much lighter baking soda dust should have no problem making it to the direct air stream.

I do think i will have to add a smaller diameter tip to it so the air/soda mix is narrower creating more force.

 

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I think u would probably need to go with a smaller I.D. tee fitting. Reason being that u would want to force the air to move thru the mixing area at a faster speed to create more vacuum. Also, if you could find a "y" fitting then I think that it would create less restriction and help with better flow of soda.
 

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Discussion Starter #11
Ok so i have the blaster completed with a couple of design changes one is i added a tip i made from a air line quick connect and the other being that its gravity fed instead of siphon fed the gravity will feed the sand better.

I still may add an inline flow regulator to the sand line to control the feed of sand but im not sure if will need to yet.







 

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Discussion Starter #13
Only a water test which worked great but i still need to get a 50 lb bag of play sand that is only about $5.00 verses $30.00 to $50.00 for blaster media.

You would think living in FL i could find sand anywhere but i guess that i will have to get it at Home Depot.
 

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Discussion Starter #14
I was thinking earlier that i forgot to test it with the tip installed which as it turns out was to small for the volume of air so all i did was back feed air into the bucket blowing water about 20 feet up in the air lol.

I think when i pick up the sand im going to grab a 1/4 or 5/16 inch tee and hose to equal out the pressure so i can still tighten up the spay pattern.
 

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So I found myself looking for ideas on a DIY sand/soda/media blaster and stumbled across your design. I like what you had going, but I'm curious how it worked for you? It's been about two months since your last post and I'm guessing that it didn't live up to your expectations. As soon as I saw the updated design with the tip, I knew what your result would be. I hope it didn't cause too big of a mess! So I was thinking to myself, what could be done differently to make this successful? Then it hits me, Daniel Bernoulli. He wrote a book back in the early 1700's on hydrology. Which is where Bernoulli's principle comes from. I don't want to go into elaborate detail, but I would recommend doing a quick search and reading about it briefly. It basically has to do with atmospheric pressure and it's relation to flow of inviscous fluids. However, it has application value in gases as well. In order to create the type of suction (atmospheric pressure loss in the tube causing AP to push the media up the hose) you would need to flip your setup around. By placing the tip or narrower end on the side of the incoming air and the widest part on the output, you'll be able to produce the effect that you're looking for. It's not the ideal setup however. Ideally, the "blowing apparatus" would work best if the transition from narrow to wide were a conical shape with the media hose connecting before the cone reaches it's widest opening. On either end of this cone you could have pipe or tubing of some kind of equal width to the opening on that end. If you search for "venturi" you'll be able to see exactly what i'm talking about. I'm going to see what I have around my shop and start making one myself. So if I come up with anything worth while I'll be sure to post my findings. But like I said, if you were to simply reverse your t-barb fitting with the tip installed to the intake, you should still get a desirable result. Let us know if that works better for you!
Regards,
Tyler
 
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