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All Springer/NP/PCP Air Gun Discussion General > Engineering- Research & Development

would you thread the bottom of a bottle?

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Madd Hatter:

--- Quote from: Motorhead on June 06, 2022, 05:25:05 PM ---Just recently did just that to a 500cc 3K aluminum bottle.  Fitted to an old school THEOBEN RAPID that had to have bottle removed to fill otherwise. ( what a PITA )
Found the bottom thickness once threaded 1/8-27 NPT has as many or more threads than the Foster fill fitting to be used.

--- End quote ---
That's what I was thinking that the flat bottom would be thicker than a rounded bottom.

stalil:
without being a engineer, I have the sense that a flat bottom is not the ideal shape as a part of a pressurized vessel. Probably it is dictated by the manufacturing proccess. Therefore it is thicker or over engineered in order to offset the non ideal shape and keep everything as safe as possible. However I am not convinced that drilling it is a very safe approach. If I have made a mod which so far has not given any trouble is not a proof that it is a safe approach generally. Anyway, thank you gentlemen for your time.

Motorhead:
For what it's worth ... Allen Zasadny ( AZ ) whom is a Very well respected tuner for many many years now has been doing similar Filler to tank bottom modifications as far back as the 90's with Theobens and similar bottle guns.
Never read or seen an issue with those done in this manor ?

stalil:
well, thanks Scott, however never seen these posts. If it has been tested often and by a respected  modder then it should be safe. I am just too cautious with hpa. If I knew it earlier it would have made things easier  for me in a couple of cases.

Motorhead:

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