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Prairie Dog Rifle Question…
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<blockquote data-quote="tacomHQ" data-source="post: 2970195" data-attributes="member: 67159"><p>We cryo all of our barrels:</p><p>a) reduced stress</p><p>b) more consistent machining processes</p><p>c) harmonically superior</p><p>d) surface toughness is theoretically improved due to realignment of the base structure</p><p>If it did not work- automotive manufacturers would drop it in a split second due to costs. Every pump gear made most likely passes thru this process.</p><p>Why for us- we used to work with tooling that had to be tuned. This tooling was under significant stress and would fracture with non-treated steel. Fracture- as in split a piece of D2 hardened tool steel that weighed 64lbs. Split it or lift off attachment surfaces. </p><p>We took two pieces of D2- consecutive bar pieces- turned and ground the ends. </p><p>Both standard heat treat.</p><p>One cryo the other not treated.</p><p>We then took a wire EDM and sliced a wafer off of the D2 (4" diameter) the wafer slice was .030" thick.</p><p>The non treated part potato chipped severely. As I recall over .040".</p><p>The treated unit produced a wafer that remained flat. </p><p>This would indicate that a piece of steel will retain its base "shape" better/longer during subsequent machining processes.</p><p>It also - in our case- made the material more stable as temperatures rise.</p><p>Nodes move with temperature. If the barrel starts to heat, bend, nodes move accuracy drops.</p><p>As a note for the engineers out there- the component we were producing had to survive a use factor over 3600x of standard use. Small factors start to count.</p><p>For those who don't believe harmonics effect accuracy - there is still a gain in toughness of the material. </p><p>NOTE: there are some companies who claim cryo processing at -125deg - that is not true cryo.</p><p>NOTE: using general terms for description.</p></blockquote><p></p>
[QUOTE="tacomHQ, post: 2970195, member: 67159"] We cryo all of our barrels: a) reduced stress b) more consistent machining processes c) harmonically superior d) surface toughness is theoretically improved due to realignment of the base structure If it did not work- automotive manufacturers would drop it in a split second due to costs. Every pump gear made most likely passes thru this process. Why for us- we used to work with tooling that had to be tuned. This tooling was under significant stress and would fracture with non-treated steel. Fracture- as in split a piece of D2 hardened tool steel that weighed 64lbs. Split it or lift off attachment surfaces. We took two pieces of D2- consecutive bar pieces- turned and ground the ends. Both standard heat treat. One cryo the other not treated. We then took a wire EDM and sliced a wafer off of the D2 (4" diameter) the wafer slice was .030" thick. The non treated part potato chipped severely. As I recall over .040". The treated unit produced a wafer that remained flat. This would indicate that a piece of steel will retain its base "shape" better/longer during subsequent machining processes. It also - in our case- made the material more stable as temperatures rise. Nodes move with temperature. If the barrel starts to heat, bend, nodes move accuracy drops. As a note for the engineers out there- the component we were producing had to survive a use factor over 3600x of standard use. Small factors start to count. For those who don't believe harmonics effect accuracy - there is still a gain in toughness of the material. NOTE: there are some companies who claim cryo processing at -125deg - that is not true cryo. NOTE: using general terms for description. [/QUOTE]
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