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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/05/2009 at 04:27
jimbo30-30 View Drop Down
Optics GrassHopper
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Hi to all
First time posting .Need some info and your forum came up. Any help would be app. alot How do they get the arid nitrigen in the scopes?Did the old weavers in the 50's have nitrogen in them?Has anyone have first hand info on working on redfield,weaverand other old scopes. Have though of working on them I can not do manual labor any more after by-pass surgery and I'm looking for a hoby, something to do . I  beleave I know why the weaver scopes go cloudy and would like to fix mine thanks Jim
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/05/2009 at 07:03
Horsemany View Drop Down
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That's an interesting topic that doesn't come up often.  I was talking to a gunsmith by the name of Cecil Tucker.  He's famous for a conversion he does to scopes known as the "Tucker Conversion".  He basically adds another spring and screw to the scope that locks the tube in place after adjustments have been made.  It's similar to the Burris Posi-Lock concept.  I asked him if he repurged the scopes after he's done his conversion.  He lives in a dry climate of Texas. 
 
His response was..."Purging is kind of a gimmick.  I don't put them together when it's humid and I sometimes blow warm air into the tube with a hairdryer before I assemble them.  Factory purgings don't last long and were invented by Leupold because they assemble their scopes in one of the wettest places in the U.S.  The nitrogen is probably leaked out by the time they leave the factory.   I've never gotten a Tucker conversion scope sent back that had fogging issues."
 
He's been doing the conversion for around 20 years and the scopes he's converted get a lot of use.   I'm sure others can chime in with more advice on purging but this is what I was told by someone who's opened up and worked on hundreds if not thousands of scopes.
 
The Weavers of the 50's did not have nitrogen in them.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/06/2009 at 00:58
jimbo30-30 View Drop Down
Optics GrassHopper
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I'm glad to hear that I'll bet my wife's old one might work. I have taken my father old 4x apart slowly because there is a 6-9 month wait for ironsightinc.com .The focal end is the worst and am looking to by some of the older scope that I think I can fix from a chair.I have found out what is wrong with mine and see ones that are bad on e-bay for good prices. Knowing which one are what age,kind etc. Which,without  doing alot of work I found the end focal lense gets damage from heat at some time. Do you or anyone know what is the clear film between the matched lenses that go together.Does anyone know why they make a 2 peace lense with clear  between?Maybe a clear spray?thank again for the info
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/06/2009 at 07:27
Horsemany View Drop Down
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I have no idea on a clear film between two lenses.  I didn't even know scopes had 2 lenses fused together.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/10/2009 at 13:17
jimbo30-30 View Drop Down
Optics GrassHopper
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Maybe I am posting in wrong location on this website for the anwsers I have. Horsermany you have giveing me some excellent info . I am just trying to learn as much as I can about how to fix older scopes.Weaver  older scope have dual lense with something between them that has gone bad. I do not think the company in ok. will give away there info on how to fix this. The front lense has a coated film in between and the focal lense has a clear film. It looks like it shrinks up from age,light heat through it or outside heat. Like do not leave your vintage rifle in sun light or over fire place mantel. Thanks again for your help and anything you can add Jim ammo man
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/10/2009 at 14:27
Palehorse View Drop Down
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Quote
The nitrogen is probably leaked out by the time they leave the factory.

I do dry Nitrogen, Argon, and Helium purges for ultra high vacuum and ultra high temperature range space and missile system optics for CCD cameras.  An "on earth" application like a rifle scope would have the benefit of positive pressure on the outside and relatively small thermal range.  The relative fraction of nitrogen on the inside will well exceed the 70% on the outside as long as a seal is not broken or changed dimension due to drying/aging/thermal shock/...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/11/2009 at 11:37
jimbo30-30 View Drop Down
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thanks Palehorse
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