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sparking bead blast cabinet

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Little Ed

10-16-2004 20:46:07

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I have been using a bead blasting cabinet with a light switch and a plug in for afilter system mounted to the top of it.I have been noticing lately that when I use it, that I will get a static spark every few seconds. I have checked the electrical system. There is no stray voltage coming from the hot wire, the ground wire of course has continuity with the white wire, and I have grounded the cabinet with a seperate wire to a seperate ground post driven through the concrete. This takes a few seconds to a minute to regenerate itself, so I think it is static build up. Is it possible for static to build from the air going through a rubber hose that connects to the hard plumbing on the wall?

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Fred OH

10-22-2004 08:09:22

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Re: sparking bead blast cabinet in reply to Little Ed, 10-16-2004 20:46:07

Little Ed...just a comment about the ground rod driven thru the concrete. In the ham radio business it seems to be the opinion of most that it is too dry up next to a foundation for a good ground (that probably includes thru the concrete) and a ground rod should be driven out about two feet from the foundation and completely underground so you won"t hit it with the mower. Just a FWIW. Fred OH

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Gatz

10-19-2004 10:24:14

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Re: sparking bead blast cabinet in reply to Little Ed, 10-16-2004 20:46:07

We had this same problem in the machine shop.
Much worse in dry weather.

The static electricity builds up and discharges through the rubber gloves and then your body. Not a good feeling.

We attached an electrical wire (insulated) from the gun to the cabinet. Worked fine.

Gatz

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Roger P.

10-17-2004 10:16:28

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Re: sparking bead blast cabinet in reply to Little Ed, 10-16-2004 20:46:07

Worst shock I ever got was when I tried to bead-blast a piece of motorcycle bodywork. Damn thing must've acted like a capacitor or something becaue my whole body went stiff for a second. There was a hefty ground wired running from the cabinet to a steel I beam too. It was scary.

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thejdman01

10-17-2004 06:43:07

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Re: sparking bead blast cabinet in reply to Little Ed, 10-16-2004 20:46:07

all you have to do is get a piece of rubber matting (old conveyor belt) truck bed mat whatever and stand on that. helps alot. the metal ring around where you stick your hands in the glove is where you get it so try not to rest your hands on there. if you have it grounded as well as you say in your description a rubber mat will help you greatly. i speak from experience been there done that.

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Little Ed

10-17-2004 06:09:30

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Re: sparking bead blast cabinet in reply to Little Ed, 10-16-2004 20:46:07

Thanks Guys. This site is the best place I have found to converse with smart fellers. I learn something new just about every time I visit. Not afraid of blowing anything up, just tired of getting shocked every few seconds. Thanks again.

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Wardner

10-16-2004 22:51:54

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Re: sparking bead blast cabinet in reply to Little Ed, 10-16-2004 20:46:07

Sandblast hose made forty years ago used to have have a copper wire embedded in the outer wrapping. It would ground the nozzle holder to the blasting pot.

New sandblast hose uses a conducting rubber compound that does the same thing. I assume it must have graphite in it.

You are probably not using genuine abrasive blast hose.

All in all, it doesn't make much difference. If you are concerned about the spark being a source of ignition on residual combustibles, you should try blasting at night without lights. There is a constant flood of sparks from the nozzle and at the point of abrasive impact. I suppose someone somewhere has blown himself up by blasting inside a vapor filled tank, but I have never heard of it. I am in the business.

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Davis In SC

10-16-2004 21:00:32

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Re: sparking bead blast cabinet in reply to Little Ed, 10-16-2004 20:46:07

Yes it is static, caused by moving air in rubber hose.You could attach a wire to gun & run it to a grounded spot to avoid this. Cold /dry weather make problem worse.....

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