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Air Gun Home Forum Index » Airgun Smithing » Safe or Silly?    View previous topic :: View next topic  Safe or Silly?   Posted: Sun Sep 02, 2012 1:09 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC Here is a photo (from the Green Forum) of a gauge fitting soldered to the side of a Benji 39X pumper tube with soft solder.... I think this is a ridiculously dangerous practice.... If the joint is perfect, maybe.... but IMO too many variables.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Sun Sep 02, 2012 1:37 pm robert w Senior Member Joined: 12 Feb 2012 Posts: 574 Location: usa i think your right bob. there are better places for it and soft solder??? _________________ ,crosman 400,gamo big cat in .22, diana 5g,diana 54 air king, diana 34 in .22 diana 34 in .177, wilrauch hw-55,and a romainian pioner training rifle , and a huge collection of powder burners 35 last count . 1 would think i have a gun store   Posted: Sun Sep 02, 2012 2:59 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Quote: If the joint is perfect, maybe Even if there is a flawless fit and the solder cooled very slowly I wouldn't trust it. There is no real mechanical connection (eg., threads), nor is there much surface area in contact between the pieces. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Sun Sep 02, 2012 8:35 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC It turns out that in the final version, there is only a "pinhole" feeding the space under the gauge.... Therefore, on further consideration.... if you have a very small hole feeding the space under the gauge, and that space is small, the "explosion" would be limited to maybe 1 FPE of energy released, depending on the volume and the pressure.... As shown, there is a potential for injury in the result of a failure.... That may not be the case if you keep the volume under the gauge, and the hole pressurizing it, small enough.... I still wouldn't do it, but in terms of safety, it MAY be OK because of the flow limiting "pinhole".... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Mon Sep 03, 2012 11:02 am lampy Veteran Member Joined: 04 Aug 2012 Posts: 297 Location: South Dakota I did something similarly unsafe, drilled and tapped a Crosman exhaust valve for a gauge so I could find out how much pressure was in the valve. I was expecting around 800 psi and was surprised when the 1500 psi gauge maxed out at 10 pumps An Apology to Casey on the Green Forum   Posted: Thu Sep 06, 2012 1:00 am rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC An Apology to Casey on the Green Forum.... I felt very strongly that the soft soldering of a gauge fitting on the outside of a Benji tube was unsafe.... Rather than simply discussing it on the Green Forum, however, I started threads about it on four other airgun forums entitled "Safe or Silly", and while it was not my intention to ridicule Casey, but to question the method, the result was I generated criticism of him, as well as better information and other ways of viewing the safety of the installation.... Once I learned that Casey restricted the flow with a pinhole, it was pointed out to me that the captured volume was small enough to not be dangerous, and I have agreed with that on this and the other Forums.... However, I had no right to take this further than the Green Forum, regardless of what my intentions were, and for that I apologize.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Thu Sep 06, 2012 3:54 pm lampy Veteran Member Joined: 04 Aug 2012 Posts: 297 Location: South Dakota If a post likes this gets one person to stop and think before they do something that gets themselves or someone else hurt I think it is worth it. Knowledge and opinions were shared and thats a good thing.   Posted: Sat Sep 08, 2012 7:19 pm yourdaddyjoe Supporting Member Joined: 26 May 2008 Posts: 4027 Location: Tatorville, USA I'll stand to the left of this rifle thank you. _________________ Say "NO" to BB Gun Wars... Quid Pro Quo Rule: An eye for an eye... www.HPASports.com www.Facebook.com/hpasports   Posted: Fri Nov 09, 2012 3:02 pm viper2788 Member Joined: 13 Oct 2011 Posts: 98 Location: Montgomery County, MD yourdaddyjoe wrote: I'll stand to the left of this rifle thank you. 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