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Tool Talk Discussion Forum

SandBlaster

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Tweeter

02-05-2005 17:29:13

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I have a 10 gallon tank sandblaster that DOES NOT work. It has the ridiculous little valve for a gun. Is there something that I might be doing wrong. It blasts for one second and stops. The tip is not clogged. I have a 26 gallon air compressor at the other end. Anyone know of a good but fairly low priced sandblaster or even a cabinet out there?

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Opa A

02-08-2005 10:33:19

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Re: SandBlaster in reply to Tweeter, 02-05-2005 17:29:13

I bought my sand pressure pot blaster last sumer and had the same problem, always stopping. Finally figured out the moisture in the air was making the sand bridge at the bottom outlet fitting. I already had a moisture trap/filter comming off the compressor but enough was still getting through. I got 2 air tanks off a wrecked semi, mounted them vertically on a stand and placed them in series between the compressor and the sand blaster, air goes in a the middle of the first tank and out the top, then to the middle of the second tank and out the top. Problem solved, I still can't believe the amount of water I drain out of the tanks after 2 or 3 hours of blasting.

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CNKS

02-06-2005 08:23:39

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Re: SandBlaster in reply to Tweeter, 02-05-2005 17:29:13

Minimum air requirement is about 25 cfm at 100 psi in order to make any progress, unless you are only doing very small parts.

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Carol Martin

02-06-2005 04:51:28

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Re: SandBlaster in reply to Tweeter, 02-05-2005 17:29:13

I have a Cheap Harbor Freight unit. This seems to work fine once you learn how to use it.. Couple questions. How many valves do you have on the unit.. mine has four.. one on the inlet.. (on and off). another that controls the balance of air to the hose and the tank and one on the bottom of the tank to meter the sand into the hose, and finally a valve on the end of the hose ( this is usless as the sand eats it up almost imediately). The procedure that I use is as follows: Close all valves then open the main inlet valve all the way. let it charge the tank. open the balance valve all the way open.. open the valve on the end of hose and you should get full blast of just air.. now Slowly open the bottom metering valve until you just get a mix of sand and air. From here on you just have to play with the adjustment of the valves The balance valve and the metering valve seem to be the ones that need fine adjustment. I run mine at about 125 PSI.. Hope this helps..

Carol

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Mike Burdick

02-05-2005 19:16:24

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Re: SandBlaster in reply to Tweeter, 02-05-2005 17:29:13

Not having a lot of information to go by I'd have to say the compressor is not supplying enough volume of air at the required pressure to it. Sand blasters require huge volumes of air and the pump has to be capable of supplying that amount � reserve tank size doesn�t enter into the equation.

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Tweeter

02-05-2005 19:31:54

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Re: SandBlaster in reply to Mike Burdick, 02-05-2005 19:16:24

I tried various pressures. I tried 60,90,100,125 psi. None of them gave me any better results.

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Mike Burdick

02-06-2005 11:27:44

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Re: SandBlaster in reply to Tweeter, 02-05-2005 19:31:54

Tweeter,

It's not only the pressure; it's also the volume of air the compressor can deliver at a certain psi that is critical. The volume of air is measured in SCFM (Standard Cubic Feet of air per Minute).

For a sand blaster, I would think one would need a compressor rated for at least 6.5 SCMF at 90psi. If your compressor can't do this than the sand blaster just won't work very well. It sounds like your unit uses a gravity feed method (because of the plastic hopper) and that makes the SCFM even more critical.

If your compressor does have this capacity then look for trouble in the sand blaster unit itself. Sand blasters are not very complicated tools!

Please let us know the results so we can help you further

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Tweeter

02-06-2005 13:38:04

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Re: SandBlaster in reply to Mike Burdick, 02-06-2005 11:27:44

My sand blaster is a steel compressed tank with a hose and a valve controled "gun."

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Mike Burdick

02-06-2005 13:45:44

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Re: SandBlaster in reply to Tweeter, 02-06-2005 13:38:04

Tweeter,

What is the rating on the compressor...what SCFM at what psi? Example 5.5 SCFM @90 psi.

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dr.sportster

02-05-2005 18:25:19

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Re: SandBlaster in reply to Tweeter, 02-05-2005 17:29:13

Tweeter,When I first got a sandblaster I went partners with a freind.At first we had this problem:it seemed the sand grains would sort of lock together in the nozzle.These were ceramic type.We had to order the next larger size nozzles.[this was even though the individual grains would pass at low press. At full press.they blocked up]Moisture increases this tendency quite a bit.Otherwise it might be a moisture clog in the lower hose under the tank.This is all a geuss at your problem hope it helps.

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old

02-05-2005 17:39:04

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Re: SandBlaster in reply to Tweeter, 02-05-2005 17:29:13

I have a tank type and a cheap wal-mart one $12 and I use the cgeap one and the other one does what yours does

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Tweeter

02-05-2005 17:47:49

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Re: SandBlaster in reply to old, 02-05-2005 17:39:04

Is the cheap one store the sand in a plastic container? What amount of pressure do you use?

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old

02-05-2005 20:58:55

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Re: SandBlaster in reply to Tweeter, 02-05-2005 17:47:49

I use the sand right out of the bag. My compresser runs at about 140 psi at max

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