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Rifles, Reloading, Optics, Equipment
Gunsmithing
Recoil Bedding; Attempt on HMR
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<blockquote data-quote="Hugnot" data-source="post: 2708430" data-attributes="member: 115658"><p>The compressive failure strength of most epoxy resins is 10,000 psi. A common .25X28 screw/bolt (common to most actions), lightly lubricated, will exert slightly under 4,000 pounds of compressive/tensile force when about 150-inch pounds of torque is applied. This indicates that any good epoxy can handle compressive forces generated with tightening actions with hand tools applied to 1/4 X 28 action screws, provided adequate/uniform support under the epoxy. The problem then is soft plastic or wood stocks under the epoxy. The solution being using a non-compressible support, like aluminum tube (pillar) or column of epoxy.</p><p></p><p>As mentioned, actions may be bent (stressed) by like 4,000 pounds of force applied by action screws. The solution is to support the action on a uniform non-compressible surface. That surface is obtained by moderate compression on the liquid non cured epoxy, by light screw tension or wrapping surgical tubing around action & stock. Actions will not be bent or stressed by light force, but the liquid epoxy will be evenly distributed by light compressive force.</p><p></p><p>My experience using JB Weld steel has been entirely satisfactory - the only problem is that dark gray industrial color sort of clash with fine wood. JB Weld Steel can be worked with ordinary wood tools. A quick read on the back of the JB Weld Steel Pack:</p><p></p><p>"J-B Weld™ is The Original Cold Weld two-part epoxy system that provides strong, lasting repairs to metal and multiple surfaces. Mixed at a ratio of 1:1, it forms a permanent bond and can be shaped, tapped, filed, sanded and drilled after curing. At room temperature, J-B Weld™ sets in 4-6 hours to a dark grey color. A full cure is reached in 15-24 hours. J-B Weld™ has a tensile strength of 5020 PSI and sets to a hard bond overnight. It can withstand temperatures up to 550ºF when fully cured."</p><p></p><p>My stuff can and has been used at temperatures up to 400 deg. F for 24 months without failure as shown by loss of adhesion or chalking. Apply enough heat to melt JB Steel and it will damage wood or plastic (stocks).</p><p></p><p>The tensile strength is different than compressive strength.</p><p></p><p>Different actions require somewhat different bedding techniques - like bedding a Rem 700 compared to a 98 Mauser - it's the location of the front action screw.</p><p></p><p>Ultimately - how good does it shoot?</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2708430, member: 115658"] The compressive failure strength of most epoxy resins is 10,000 psi. A common .25X28 screw/bolt (common to most actions), lightly lubricated, will exert slightly under 4,000 pounds of compressive/tensile force when about 150-inch pounds of torque is applied. This indicates that any good epoxy can handle compressive forces generated with tightening actions with hand tools applied to 1/4 X 28 action screws, provided adequate/uniform support under the epoxy. The problem then is soft plastic or wood stocks under the epoxy. The solution being using a non-compressible support, like aluminum tube (pillar) or column of epoxy. As mentioned, actions may be bent (stressed) by like 4,000 pounds of force applied by action screws. The solution is to support the action on a uniform non-compressible surface. That surface is obtained by moderate compression on the liquid non cured epoxy, by light screw tension or wrapping surgical tubing around action & stock. Actions will not be bent or stressed by light force, but the liquid epoxy will be evenly distributed by light compressive force. My experience using JB Weld steel has been entirely satisfactory - the only problem is that dark gray industrial color sort of clash with fine wood. JB Weld Steel can be worked with ordinary wood tools. A quick read on the back of the JB Weld Steel Pack: "J-B Weld™ is The Original Cold Weld two-part epoxy system that provides strong, lasting repairs to metal and multiple surfaces. Mixed at a ratio of 1:1, it forms a permanent bond and can be shaped, tapped, filed, sanded and drilled after curing. At room temperature, J-B Weld™ sets in 4-6 hours to a dark grey color. A full cure is reached in 15-24 hours. J-B Weld™ has a tensile strength of 5020 PSI and sets to a hard bond overnight. It can withstand temperatures up to 550ºF when fully cured." My stuff can and has been used at temperatures up to 400 deg. F for 24 months without failure as shown by loss of adhesion or chalking. Apply enough heat to melt JB Steel and it will damage wood or plastic (stocks). The tensile strength is different than compressive strength. Different actions require somewhat different bedding techniques - like bedding a Rem 700 compared to a 98 Mauser - it's the location of the front action screw. Ultimately - how good does it shoot? [/QUOTE]
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