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Rifles, Reloading, Optics, Equipment
Gunsmithing
Bedding rifle stock
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<blockquote data-quote="Hugnot" data-source="post: 2625640" data-attributes="member: 115658"><p>I think pillar bedding is intended to avoid compression of the stock by action screw/bolt tension. & maintain consistent tension, like no stock shrinkage or compression. Taking a .25 X 28 thread screw & applying 60 inch pounds of torque to the screw about 1,200 pounds of compressive tension force can be generated. In addition to compressing the stock (wood, part of a big dead plant or soft plastic), receivers may also be flexed. Best to maintain pillar dimensions, allow the existing pillars to support the receiver. Various epoxy bedding compounds may be added but the receiver & stock is already "bedded" - no need to add epoxy unless the stock is damaged, don't change pillars (passive devices, no movement, no wear).</p><p></p><p>I like J-B Epoxy Steel Resin. 1 oz of resin & 1 oz of hardener will bed the receiver of most rifles for less than $10. This includes a skim coat on the sides of the magazine well. Allowing the J-B to flow between stock & bottom metal will make for a column to support the receiver after slightly enlarging the existing hole around the action screw & allow easy tightening up to final engagement. J-B tensile strength is about 3,900 psi, compressive strength much greater. Use just enough screw tension to make the liquid epoxy flow to desired fit.</p><p></p><p>Be sure to use a release agent, like on all metal surfaces, especially threaded screw holes. No problems with Kiwi shoe polish. I like brown because it makes the coating visible & most wood is brown. Make dams out of modeling clay to prevent epoxy from flowing into unwanted places. Acetone is a good uncured epoxy solvent but be sure to use in a vented place & keep it off skin. Some lab guys I once knew, died splashed lots of acetone on stuff to prepare slides,& clean electronics and they died from blood cancers at ages late 30's to mid 80's - treat it like an explosive poison.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2625640, member: 115658"] I think pillar bedding is intended to avoid compression of the stock by action screw/bolt tension. & maintain consistent tension, like no stock shrinkage or compression. Taking a .25 X 28 thread screw & applying 60 inch pounds of torque to the screw about 1,200 pounds of compressive tension force can be generated. In addition to compressing the stock (wood, part of a big dead plant or soft plastic), receivers may also be flexed. Best to maintain pillar dimensions, allow the existing pillars to support the receiver. Various epoxy bedding compounds may be added but the receiver & stock is already "bedded" - no need to add epoxy unless the stock is damaged, don't change pillars (passive devices, no movement, no wear). I like J-B Epoxy Steel Resin. 1 oz of resin & 1 oz of hardener will bed the receiver of most rifles for less than $10. This includes a skim coat on the sides of the magazine well. Allowing the J-B to flow between stock & bottom metal will make for a column to support the receiver after slightly enlarging the existing hole around the action screw & allow easy tightening up to final engagement. J-B tensile strength is about 3,900 psi, compressive strength much greater. Use just enough screw tension to make the liquid epoxy flow to desired fit. Be sure to use a release agent, like on all metal surfaces, especially threaded screw holes. No problems with Kiwi shoe polish. I like brown because it makes the coating visible & most wood is brown. Make dams out of modeling clay to prevent epoxy from flowing into unwanted places. Acetone is a good uncured epoxy solvent but be sure to use in a vented place & keep it off skin. Some lab guys I once knew, died splashed lots of acetone on stuff to prepare slides,& clean electronics and they died from blood cancers at ages late 30's to mid 80's - treat it like an explosive poison. [/QUOTE]
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Bedding rifle stock
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