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Interesting info, thanks for posting.
Great work, rsilvers. Were the springs generally linear, or was there any surprise in spring force vs. length?
It's kind of neat to see the SpringCo blue and red springs exerting ~7.5 and ~8.0 pounds of force, respectively, when compressed. I've always liked how pistol spring manufacturers will straight up sell you a "16 pound spring" without resorting to goofy color codes. Now we finally know what "red" and "blue" mean in this particular context.
Last edited by kartoffel; 12-09-11 at 12:51.
Oh no, not another lube thread! Read this first: Lubrication 101.
What have you been cutting on that mill? Looks like sawdust all over the place.
Pinewood Derby
Double check those lengths and forces on the A5.
Looks like a dup.
Also it would be good to verify the force at the recoil length compared to what the software says the force is.
If they agree, then the stress number is supported.
Also with both forces and the stroke you can show the work / energy that the spring can store.
Last edited by Clint; 12-09-11 at 22:02.
Black River Tactical
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So reading your data, I see that the Tubbs flatwire CS spring is stressed the most, but even at mid 40%, it still has a significant margin.
For comparison, what other stressed parts exists on an AR, and what are their stress levels as a percentage of tensile strength? For example, the lugs on a bolt? The pins in a FCG or the bolt overrun stop? the buffer retainer pin? The barrel at MAP? What are their margins?
Regarding buffer springs specifically, if you were to conduct these tests after 5,000 rounds after spring-set set in, would the resultant stress level percentages be the same, or less, or more?
The chart is interesting, but I have no idea if best engineering practices suggest you should to design in a margin factor of 2X or 3X or more for "stressed" parts.
this is really cool, I like here!
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