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The Range
Rifle & Shotgun Discussion
Empirical Evidence for AR Supremacy ???
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<blockquote data-quote="Spiff" data-source="post: 892108" data-attributes="member: 2228"><p>I'll admit that I don't have any experience with shot peening in industry, so I'll have to take the easy way out and drop some quotes from a couple of my textbooks...</p><p></p><p></p><p></p><p>and...</p><p></p><p></p><p></p><p>Since a bolt is hardened steel, I would expect the depth of compression to be quite a bit smaller, like you said.</p><p></p><p>The only limit to residual stresses that I'm aware of is that they have to sum to zero, otherwise the part'll be flying around and causing mayhem. As long as you have all compressive stresses in the radial direction, they sum to zero, and you're good. </p><p></p><p>I will agree with you about MPI though...it probably is more of a feel good test than anything. And certainly a rough bolt or one with inclusions is a definite no bueno.</p><p></p><p></p><p></p><p>If a bolt's gonna let go, it'll usually do it at the cam pin hole. There, obviously, you've got the least amount of material, highest stresses, and a big freakin' stress riser.</p><p></p><p></p><p></p><p>Well, since you've taken most of my choices away <img src="/images/smilies/biggrin.png" class="smilie" loading="lazy" alt=":D" title="Big Grin :D" data-shortname=":D" />, and since firing pin retainers usually stay together (as long as you have a shrouded carrier and you don't put one of those dumb solid retainers in), I'm gonna have to say it's the bolt that goes most often, with the cam pin as second.</p></blockquote><p></p>
[QUOTE="Spiff, post: 892108, member: 2228"] I'll admit that I don't have any experience with shot peening in industry, so I'll have to take the easy way out and drop some quotes from a couple of my textbooks... and... Since a bolt is hardened steel, I would expect the depth of compression to be quite a bit smaller, like you said. The only limit to residual stresses that I'm aware of is that they have to sum to zero, otherwise the part'll be flying around and causing mayhem. As long as you have all compressive stresses in the radial direction, they sum to zero, and you're good. I will agree with you about MPI though...it probably is more of a feel good test than anything. And certainly a rough bolt or one with inclusions is a definite no bueno. If a bolt's gonna let go, it'll usually do it at the cam pin hole. There, obviously, you've got the least amount of material, highest stresses, and a big freakin' stress riser. Well, since you've taken most of my choices away :D, and since firing pin retainers usually stay together (as long as you have a shrouded carrier and you don't put one of those dumb solid retainers in), I'm gonna have to say it's the bolt that goes most often, with the cam pin as second. [/QUOTE]
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