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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Machinist Mondays with Defiance
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<blockquote data-quote="DefianceMachine" data-source="post: 2583894" data-attributes="member: 117946"><p>[ATTACH=full]382017[/ATTACH]</p><p></p><p>Stress Kills.</p><p> </p><p>Machinists need to learn how to handle stress, and I'm not talking about the kind you feel when you scrap a part.</p><p> </p><p>Metal has stress and it needs to be considered when you're trying to machine something to exact specifications including straightness, roundness, and perpendicularity.</p><p> </p><p> It's like there are springs between the atoms that are pushing or pulling against each other. When material is removed, that allows the metal to move under that strain. A long piece of metal that has not been "stress-relieved" can bow like a banana if you remove a significant amount of material from one side. It's hard to make precision parts this way.</p><p> </p><p> We do several things to manage stress:</p><p> </p><ul> <li data-xf-list-type="ul">We machine all critical components such as bolts, receivers, firing pins, cocking pieces, etc. out of pre-hardened aircraft certified steels. These metals have been heat-treated to harden, temper and stress-relieve. If we machined material in the annealed (soft) state then hardened it, it would change shape and dimension.</li> <li data-xf-list-type="ul">We handle the material gently, from off-loading the 12' bars from the truck to shipping the final product.</li> <li data-xf-list-type="ul">We choose machining methods that do not induce additional stress into the steel such as Wire EDM, rather than broaching.</li> <li data-xf-list-type="ul">We leave mass where we can. Our target actions have custom magazine cuts, heavy rear tangs, and integral scope rails that leave material on the receiver making bowing less likely.</li> <li data-xf-list-type="ul">We are strategic about how we remove material. Techniques such as spiral milling are utilized to avoid removing material from one side before the other.</li> </ul><p>These tactics keep our finished product straight and true when they come out of the machine and after 100,000 firings.</p></blockquote><p></p>
[QUOTE="DefianceMachine, post: 2583894, member: 117946"] [ATTACH type="full"]382017[/ATTACH] Stress Kills. Machinists need to learn how to handle stress, and I'm not talking about the kind you feel when you scrap a part. Metal has stress and it needs to be considered when you're trying to machine something to exact specifications including straightness, roundness, and perpendicularity. It's like there are springs between the atoms that are pushing or pulling against each other. When material is removed, that allows the metal to move under that strain. A long piece of metal that has not been "stress-relieved" can bow like a banana if you remove a significant amount of material from one side. It's hard to make precision parts this way. We do several things to manage stress: [LIST] [*]We machine all critical components such as bolts, receivers, firing pins, cocking pieces, etc. out of pre-hardened aircraft certified steels. These metals have been heat-treated to harden, temper and stress-relieve. If we machined material in the annealed (soft) state then hardened it, it would change shape and dimension. [*]We handle the material gently, from off-loading the 12' bars from the truck to shipping the final product. [*]We choose machining methods that do not induce additional stress into the steel such as Wire EDM, rather than broaching. [*]We leave mass where we can. Our target actions have custom magazine cuts, heavy rear tangs, and integral scope rails that leave material on the receiver making bowing less likely. [*]We are strategic about how we remove material. Techniques such as spiral milling are utilized to avoid removing material from one side before the other. [/LIST] These tactics keep our finished product straight and true when they come out of the machine and after 100,000 firings. [/QUOTE]
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