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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How Many Tune Rifles with Action Screw Torque
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<blockquote data-quote="Trickymissfit" data-source="post: 441233" data-attributes="member: 25383"><p>I think you missunderstood my comment. When coating threads with Neversieze you can (and should) reduce the actual applied torque to the threads by 50%. I've personally found it to be closer to 30% due to thread quality, and contact values. If the thread was aircraft quality and ground, then yes I'd reduce the torque value by 50%. This and the fact that most all bolts use a rolled thread instead of a cut thread gives me the numbers. Virtually all threads with the exception of a ground thread with a proper helix angle will not hold 100% of their torque value. It's the nature of the beast, and also is why Loctite is in business. You torque a bolt down to 50 ft. lb. and check it a year later and it's maybe 40 ft. lb. Plus bolt quality varies all over the place unless you use a premium quality bolt. In high stress areas many folks are now useing a dial indicator to measure thread stretch rather than applied torque (normally only seen the a nut & bolt). Also 95% of the bolt manufaturers will tell you it's almost a waste of time to torque a bolt to a certain spec without a hardened washer under the head. </p><p> </p><p> The reason the glass bedding is cracking under compression is not due to torque, but the reciever acting as a wedge trying to split the stock. There are compounds that will not split under a hundred pounds of torque, and are readilly accessable to the masses. Yet whoever is putting them together is still stuck in the 1970's. This also kinda shows a flaw in the stock design as well. It's a well known problem with all round actions, and pillar bedding stops this.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 441233, member: 25383"] I think you missunderstood my comment. When coating threads with Neversieze you can (and should) reduce the actual applied torque to the threads by 50%. I've personally found it to be closer to 30% due to thread quality, and contact values. If the thread was aircraft quality and ground, then yes I'd reduce the torque value by 50%. This and the fact that most all bolts use a rolled thread instead of a cut thread gives me the numbers. Virtually all threads with the exception of a ground thread with a proper helix angle will not hold 100% of their torque value. It's the nature of the beast, and also is why Loctite is in business. You torque a bolt down to 50 ft. lb. and check it a year later and it's maybe 40 ft. lb. Plus bolt quality varies all over the place unless you use a premium quality bolt. In high stress areas many folks are now useing a dial indicator to measure thread stretch rather than applied torque (normally only seen the a nut & bolt). Also 95% of the bolt manufaturers will tell you it's almost a waste of time to torque a bolt to a certain spec without a hardened washer under the head. The reason the glass bedding is cracking under compression is not due to torque, but the reciever acting as a wedge trying to split the stock. There are compounds that will not split under a hundred pounds of torque, and are readilly accessable to the masses. Yet whoever is putting them together is still stuck in the 1970's. This also kinda shows a flaw in the stock design as well. It's a well known problem with all round actions, and pillar bedding stops this. gary [/QUOTE]
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How Many Tune Rifles with Action Screw Torque
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