Static Electricity in reloading area - Page 2

Clark · September 22, 2016, 03:13 PM

I was helping a defibrillator company with electro magnetic interference [EMI] problems 20 years ago. There would not have been a problem in metal chassis with a few small capacitors to the chassis, but for aesthetic reasons they needed and injection molded plastic chassis that had the style of the day.

I could send the chassis out [to a painting subcontractor] for a conductive paint job. It just made the insides look brown. The problem I have was how I was going to connect to the paint in a way that would last long term. The firemen were grabbing these defibrillators and running into emergencies with them. I tried crazy stuff like a long coil spring with a high spring index ratio [coil diameter divided by wire diameter] that pinched into the paint at many points when the case was closed. It might be easier for the slower static problem, as we could have higher inductance path.

gwpercle · September 22, 2016, 04:03 PM

For whatever reason plastic does the static electricity thing , remember the comb run through your hair and how it picks up bits of paper ?

I found an aluminum funnel....no static electricity what so ever !
Get a small one for powder into cases and a larger one for pouring powder back into the canister. No sticking , no sparks and they flow free.

Gary

September 22, 2016, 03:13 PM	#26
Clark Senior Member Join Date: December 4, 1999 Location: WA, the ever blue state Posts: 4,678	I was helping a defibrillator company with electro magnetic interference [EMI] problems 20 years ago. There would not have been a problem in metal chassis with a few small capacitors to the chassis, but for aesthetic reasons they needed and injection molded plastic chassis that had the style of the day. I could send the chassis out [to a painting subcontractor] for a conductive paint job. It just made the insides look brown. The problem I have was how I was going to connect to the paint in a way that would last long term. The firemen were grabbing these defibrillators and running into emergencies with them. I tried crazy stuff like a long coil spring with a high spring index ratio [coil diameter divided by wire diameter] that pinched into the paint at many points when the case was closed. It might be easier for the slower static problem, as we could have higher inductance path. __________________ The word 'forum" does not mean "not criticizing books." "Ad hominem fallacy" is not the same as point by point criticism of books. If you bought the book, and believe it all, it may FEEL like an ad hominem attack, but you might strive to accept other points of view may exist. Are we a nation of competing ideas, or a nation of forced conformity of thought?

September 22, 2016, 04:03 PM	#27
gwpercle Senior Member Join Date: November 30, 2012 Location: Baton Rouge, Louisiana Posts: 1,752	For whatever reason plastic does the static electricity thing , remember the comb run through your hair and how it picks up bits of paper ? I found an aluminum funnel....no static electricity what so ever ! Get a small one for powder into cases and a larger one for pouring powder back into the canister. No sticking , no sparks and they flow free. Gary