GTA
All Springer/NP/PCP Air Gun Discussion General => Machine Shop Talk & AG Parts Machining => Engineering- Research & Development => Topic started by: Ronno6 on January 03, 2022, 10:30:07 AM
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In my idyll musings at 0300, my mind came back around to the thought of making a double O-ring pump piston for Daisy 880 series guns.
Daisy uses the 113 O-ring (single) from the factory.
If going with a double O-ring setup , should I stay with the 113 or go the smaller cross section 016??
What would be the advantages/disadvantages ??
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Double O-rings are a waste of time, machining, and space.... O-rings seal because of the pressure differential across them....
Bob
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The 016 seems flimsy as a piston ring.
Incidentally, Duro 70 016 and 113 are the O-rings that I use on my custom Disco and 17xx guns—-well, they are OEM on these guns for gauge blocks, fill ports, and valves.
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Double O-rings are a waste of time, machining, and space.... O-rings seal because of the pressure differential across them....
Bob
Well, that pretty much takes the wind out of my sails.........
Daisy uses a double O-ring piston on the high-performance Winnie 1977
That is what I was using as my model.
Thanks.
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The 016 seems flimsy as a piston ring.
Incidentally, Duro 70 016 and 113 are the O-rings that I use on my custom Disco and 17xx guns—-well, they are OEM on these guns for gauge blocks, fill ports, and valves.
Thaks.
Those are static applications. The pump piston use is dynamic....
Dunno if that is a factor.
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I don't think it will make a significant difference, but maybe try this style o-ring?
https://www.mcmaster.com/rings/cross-section-shape~x/ (https://www.mcmaster.com/rings/cross-section-shape~x/)
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I don't think it will make a significant difference, but maybe try this style o-ring?
https://www.mcmaster.com/rings/cross-section-shape~x/ (https://www.mcmaster.com/rings/cross-section-shape~x/)
Ahhhh, ye olde Quad ring........ I just might give them a shot!
They don't appear to be too expensive, and are drop-in replacements;
Why do you suppose Daisy doesn't use them in the first place??