Deleted
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Post by Deleted on Jun 6, 2011 17:52:47 GMT -5
Do you have any shocking updates for us on this subject, Tom? #PopCorn# #PopCorn# Yeah.....when I don't use the cabinet, I don't get shocked! ;D Cheap thrill eh Tom.
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brock
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Post by brock on Jun 6, 2011 23:10:24 GMT -5
The temporary ground is great for finding a solution - but, it get's hard to find unsuspecting guinea pigs to help see if you've made progress.
The chassis should be grounded to ground on your electric cord. Is your shops' electricity electrically bonded to a good 6' ground rod? It could be (if you answered yes to all the above) the your soils' ph just isn't doing it for you. Yours is a metal shop, so, it should be grounded all ready. Might be possible to just connect extra grounds (or just check for them) in the following places: a) Lid to chassis - just a short 10 gauge wire lugged & screwed into the lid & chassis on the outside near the hinge. b) chassis to power cord / pump motor. c) receptacle ground to building. d) 3 wire conductor all the way to the breaker box. e) both ground & neutral connections in breaker box - there is a difference. f) breaker box ground actually connected with a copper wire to a ground rod.
Then again you could just change out your shoes & be fine!
All the above do matter though!
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Post by Deleted on Jun 7, 2011 16:07:46 GMT -5
The cabinet has a plastic body. Its only electrical parts are the light. I basically ruled out the light as I get the same shock whether I have the light on or not. The cabinet is not in any way grounded. ..And frankly I probably won't be driving a 6 ft rod thru the concrete of my garage to provide it with one.. If I used it on a daily basis, maybe I would.
My thought is that the blasting process creates a static charge on the surface of the part being blasted and that charge seeks ground thru me. I suspect the hotter weather, my sweating hands, and old (deteriorated) blasting gloves probably help make this happen. This makes sense since the longer I use the cabinet, the sweatier my hands become, the more issue the shocks become. I need to replace the gloves, and I will continue to wear disposables also. Problem solved.
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Post by Deleted on Jun 7, 2011 16:13:21 GMT -5
The cabinet has a plastic body. Its only electrical parts are the light. I basically ruled out the light as I get the same shock whether I have the light on or not. The cabinet is not in any way grounded. ..And frankly I probably won't be driving a 6 ft rod thru the concrete of my garage to provide it with one.. If I used it on a daily basis, maybe I would. My thought is that the blasting process creates a static charge on the surface of the part being blasted and that charge seeks ground thru me. I suspect the hotter weather, my sweating hands, and old (deteriorated) blasting gloves probably help make this happen. This makes sense since the longer I use the cabinet, the sweatier my hands become, the more issue the shocks become. I need to replace the gloves, and I will continue to wear disposables also. Problem solved. I need to replace the gloves, and I will continue to wear disposables also. Problem solved. I hope you meant disposable gloves.
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brock
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Post by brock on Jun 9, 2011 0:28:27 GMT -5
Not suggesting driving a ground rod through the slab - out beside the slab near the service entrance. Surely there is all ready one there IF the building is on it's own meter (by code) Just things to check was all.
The cabinet is plastic?! A rubber floor mat might not help either, but worth a try if you have 1 laying around.
Then again a couch doesn't help when a kid uses carpet to wake you up from a nap either. Zap.
I know static & metal - but this is beyond me.
I'm ALL ears!
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Post by icy71rt on Jul 14, 2011 16:59:05 GMT -5
Yup this is common with blasting cabinets. A static charge is <quickly> created from the high-speed media flowing through the hose. Actually, the more dry the media the greater and quicker the <dis>charge if you follow me. We have a large industrial blasting cabinet here at work that I use all the time, and if I don't use the ground strap on it, well it really smarts! I'll get a shock from the cabinet into my forearm (closest point to contact) every 20 seconds or so, and yes its pretty annoying! So I always use the provided wrist-strap. Its just a computer anti-static strap thats worn around your forearm prior to sticking it in the gloves/cabinet. The other end is an alligator clamp to a wing nut holding the viewing window into the chassis. But its a simple grounding device from you to the cabinet. Does the trick perfectly. Just make a trip to Best-Buy. They're around $10. And yes, plastic does conduct very well. All our plastic pails in the plant are required to be connected to ground before we do any sampling of anything flammable. Static buildup can be a real hazard.
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Topher
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Post by Topher on Jul 17, 2011 14:10:12 GMT -5
I'll have to try the ground strap. I've got an upright Blue Point cabinet, and I get zapped on the fingers holding small parts(through 2 gloves), and the fore arm near the base of the glove. I put a chain on the bottom rail of the cabinet and draped it to the floor like the static chains on fork lifts, but it didn't stop the shocking.
How often do you guys change out your glass bead? I've serviced mine 3 times in a year, and it's used a couple hours a month on average.
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