If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
Ok there seems to be two misconceptions in the mix here, and a bit of wondering off topic.
Firstly, tinting has absolutely nothing to do with UV protection. Zero. Tinting provides protection from light in the visible wavelength. I'm not sure how many people here have built a ZVS (most, I'd wager), or done some welding, but the ZVS arcs are not that bright. In fact, they're dim enough that I doubt you'd be able to see very much of them with a #3 lens on a welder's mask, much less a #6.
UV protection is accomplished simply by having material between you and the source. Window glass is quite an effective UV barrier, as is most plastic. A vast majority of quality safety glasses (Which you should be wearing anyway!) offer 100% UV A and UV B protection, and say so right on the glasses or packaging.
As for the off topic wandering, he's asking about the specific case of his ZVS. Not MOTs, Pole Pigs, or nuclear reactors. Even so, with a single MOT, I've never managed to get an arc, even at only a few mm long, to create a bright enough flash to be dangerous in the visible wavelengths. If visible light isn't the risk, then again, the safety glasses or sunglasses will work fine.
Honestly, in my mind, you'd have to be a bit insane to willingly wear a welder's mask when working with your average HV projects unless you could turn it off and on and do whatever you're trying to do without ever touching the device. Why would you ever put your hands near a lethal voltage source half blindfolded? With larger projects or where you have appreciable stand-off distance, that changes matters a good bit and makes it more reasonable.
Registered Member #2915
Joined: Fri Jun 11 2010, 10:41AM
Location: Malaysia!
Posts: 101
Personally,to be honest I never use protection on "dull" arcs; NST, flyback arcs. but when playing with my resonant MOT I always use welding goggles, otherwise its painful to look at,I have someone else flip the switch when I draw the arcs, and vice versa. Its probably overkill, but At least it doesn't leave a green tinge in my eyes when it burns my retina, batter safe that sorry... I have seen ZVS arcs and they do not seem to bright...
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
A tiny bit of clarification! The reason i suggested the #3 through possibly #6 shade is because i did not know the brightness of the arc in question. A number 3 shade is equivalent to a good pair of sunglasses, maybe not as dark or too dark, thats why i said try them out. Also, the tint in welding goggles, helmets, and glasses is green. Green because it makes use of the arc light to help you see the surrounding work area when you wear them. Regardless of the shade # they will all block out uva and uvb light (which i believe is what youre after here). Welding equipment obviously goes through a bit more testing of its true protection than say, some shades you picked up at a gas station. The shade is up to you obviously, maybe a shade #1 is all you need! No matter how you slice it, why take a chance with your vision when you can protect it for a few bucks less than the current cost of a pack of smokes. I have been a welder for about 18 years and i still have 2020 vision. Your arcs are comparable to those you would see in a plasma globe i am going to assume. I have heard that the glass that the globe is made of does block uva and uvb light, but it sure lights up a blacklight poster!!
Moral of the story is like Dave said," A vast majority of quality safety glasses (Which you should be wearing anyway!) offer 100% UV A and UV B protection, and say so right on the glasses or packaging." My apologies if i swayed the topic away from the original, but i hope the info is useful to you!!
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.