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jdmartin
11-24-2010, 08:48 AM
What is the recommended response speed for an auto-darkening helmet to go from light to dark? I am researching various helmets to determine which would be the most cost effective, and I've noticed quite a range of response speeds.

Your input and experience would be greatly appreciated.

Jim

mausball
11-24-2010, 09:38 AM
What is the recommended response speed for an auto-darkening helmet to go from light to dark? I am researching various helmets to determine which would be the most cost effective, and I've noticed quite a range of response speeds.

Your input and experience would be greatly appreciated.

Jim

This is a case where faster is always better. Less exposure to the welding flash is a good thing. Your eyes will thank you.

Radical Brad
11-24-2010, 10:11 AM
If you find the specs, please let me know. I have tried to find an actual response time of these lenses so I might use one to control a laser, but have never found an actual value in milliseconds or possible nanoseconds. I would really like to have a data sheet on the lens.

Brad

ken will
11-24-2010, 10:34 AM
This is the one I use.

http://www.northerntool.com/shop/tools/product_200311850_200311850

They claim a Switch time of 1/25,000 sec.

More expensive ones are faster.

jdmartin
11-24-2010, 11:07 AM
Ken,

How is that response time working for you? Are you satisfied with that helmet, as most of the ones I've researched seem to have the .025 response time also. Some of the really cheap ones are .030 (1/30,000), which would seem to be definitely borderline....

Jim

This is the one I use.

http://www.northerntool.com/shop/tools/product_200311850_200311850

They claim a Switch time of 1/25,000 sec.

More expensive ones are faster.

jdmartin
11-24-2010, 11:09 AM
Brad,

Actually, every helmet I've researched always show the lens response time from light to dark, and some even have the response time back to 'light', depending on the helmet delay settings....Fast, Normal, Slow...


If you find the specs, please let me know. I have tried to find an actual response time of these lenses so I might use one to control a laser, but have never found an actual value in milliseconds or possible nanoseconds. I would really like to have a data sheet on the lens.

Brad

jdmartin
11-24-2010, 11:18 AM
Brad,

Check out this link......go to page 19 of 37 for a complete data sheet on the auto darkening lens used with this helmet.....good stuff in this pdf file...

P.S. FYI, I believe all auto-darkening lenses state the response time in microseconds

http://www.thermadyne.com/IM_Uploads/DocLib_3832_0-5045.pdf

Jim


If you find the specs, please let me know. I have tried to find an actual response time of these lenses so I might use one to control a laser, but have never found an actual value in milliseconds or possible nanoseconds. I would really like to have a data sheet on the lens.

Brad

ken will
11-24-2010, 01:36 PM
Ken,

How is that response time working for you? Are you satisfied with that helmet, as most of the ones I've researched seem to have the .025 response time also. Some of the really cheap ones are .030 (1/30,000), which would seem to be definitely borderline....

Jim

It works fine, except one day I did not know the sensor was dirty.
Depending on how I positioned my head it would sometimes not darken.
Finally when I noticed how dirty it was (slapped my forehead and said "Doh!") cleaned it and then it worked fine again.

smitty
11-24-2010, 03:02 PM
I have a helmet ,(originally purchased thru ebay, in Toronto), that has service me well over the past ten years. It originally cost me about 40.00 and it is a 1/25,000 response time. I'm sure the same helmet today would run around 70.00 - 100.00. As Ken already mentioned, it's IMPERATIVE that the lens be protected from both dust and normal wear. make sure that the helmet comes with a replacable lens cover. I made the mistake of removing mine and the lens cover was slightly damaged from normal wear and tear... which could ultimately mean a decreased response time, as well as not being able to see your work.

Take care, you only have one pair of eyes!
Smitty

Racer46
11-24-2010, 03:47 PM
Ken,

How is that response time working for you? Are you satisfied with that helmet, as most of the ones I've researched seem to have the .025 response time also. Some of the really cheap ones are .030 (1/30,000), which would seem to be definitely borderline....

Jim

Jim,

Not enough zeros, 1/30,000 = 0.00003333... 1/25,000 = 0.00004.

This is the one I'm using: HF Auto Darkening Helmet (http://www.harborfreight.com/adjustable-shade-auto-darkening-welding-helmet-46092.html) It has a claimed response time of 1/20,000 or 0.00005 second and I don't think I've ever been "Flashed". I don't have any discomfort or spots during or after welding.

threewheeler
11-24-2010, 07:00 PM
http://www.northerntool.com/shop/tools/product_200416894_200416894?cm_sp=Upsells-_-Top%20Sellers-_-Product%20Page This one is great i really like the large view.