GTA
All Springer/NP/PCP Air Gun Discussion General => Air Gun Gate => Topic started by: Confederut on March 16, 2016, 02:07:21 PM
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Have any of you tried a spring setup like the following...excerpt from Diamond Tooling.
Nested compression springs: Sometimes, you'll need a compression spring that's stronger than any single spring can be. In that case, you can make nested compression springs — one spring inside the other — that will be a lot stronger than a single spring. Some automobile valve spring assemblies are actually nested springs, so are the suspension springs on railroad cars. Nested compression springs are easily designed: just remember two things:
Nested compression springs must be different-handed. If the outer spring is right-handed, then the inner spring must be left-handed, or vice-versa.
The outside diameter of the inside spring CANNOT be larger than the inside diameter of the outside spring. If it is, the springs will not nest.
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Yes,
Not a common practice, but in PCP hammer springs, nested configurations do show up ... notably RAW
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I think that you'd be pretty much wasting your time with that. In most cases, unless the gun is way undersprung to start with, a stronger spring won't add any more velocity, only make it harder to cock, and rougher to shoot. The key to getting more power is pushing more air, either with a larger or longer (or both) piston. I can't think of a single case where a single spring won't do the job. The only possible pluss would be to cancel spring torque, but the springs rubbing together on cocking and firing might cause other problems.
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Used that setup in a big bore ar/qb build. Works quite well. Now for use in a springer ,never heard of it.
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Have any of you tried a spring setup like the following...excerpt from Diamond Tooling.
Nested compression springs: Sometimes, you'll need a compression spring that's stronger than any single spring can be. In that case, you can make nested compression springs — one spring inside the other — that will be a lot stronger than a single spring. Some automobile valve spring assemblies are actually nested springs, so are the suspension springs on railroad cars. Nested compression springs are easily designed: just remember two things:
Nested compression springs must be different-handed. If the outer spring is right-handed, then the inner spring must be left-handed, or vice-versa.
The outside diameter of the inside spring CANNOT be larger than the inside diameter of the outside spring. If it is, the springs will not nest.
Yup!
It's been done before, but not for power. For stability.
Look for the diagram of the Anschütz 380; if you can, get to borrow one and try a shot or two, and be prepared to be amazed at what a real sled system semi-recoil-less Match Spring gun is. It leaves the FWB300 in its dust trail.
BTW, last spring gun rifle to win an Olympic Gold medal.
;)
Keep well and shoot straight!
Héctor Medina
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I have a relum telly and a relum taurus (both hungarian made springers by FEG) that were originally made with nested springs. They were opposite-wound as mentioned. The smaller inside spring served as a quasi-spring guide. With the double springs, cocking the gun sounded like dragging chains over concrete blocks. Twang and buzz were so loud it's difficult to put into words. I changed both guns to a single spring and made a spring guide to fit. The guns are now quiet and smooth (still have the leather piston seals) and haven't lost much velocity.
The Telly shoots 570 fps with a single spring and a 7.5 gr pellet. With the nested springs, it barely made it over 600 fps. In the case of these guns, the nested springs were more marketing than engineering. Very few people had chronographs in the 70s, so wild velocity claims were hard to disprove.
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As a follow up ... Years past as mentioned by Hector, the Diana 75 GISS match rifles had them.
Tho inner spring ran on an internal guide independent of outer spring guided on I.D. of pistons.
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As a follow up ... Years past as mentioned by Hector, the Diana 75 GISS match rifles had them.
Tho inner spring ran on an internal guide independent of outer spring guided on I.D. of pistons.
Also, I believe the Diana 6 pistol has two counter wound inner springs and a third outer spring!
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Here's the 380 with 2 springs shown. Update...sent worn out spring to Diamond, we'll see what they come up with.
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Here's the 380 with 2 springs shown. Update...sent worn out spring to Diamond, we'll see what they come up with.
Umm, that's a lot of parts...