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Hunting
Long Range Hunting & Shooting
Nightforce front base keeps coming loose
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<blockquote data-quote="ntsqd" data-source="post: 1884902" data-attributes="member: 93138"><p>I think it is a mistake to view the mounting screws as being in shear. Any pins used are, but these screws aren't and if they are they won't live. They're there to clamp the bases to the action and it is the friction between those two surfaces that resists the recoil. Flywheel bolts aren't in shear, they aren't big enough nor are they numerous enough to transmit the crank's power. It is the clamp-load's friction between the flywheel and the crank flange that transmits the load. This is why the fit between the two surfaces is so important. It is also why the bolt's install torque is so critical.</p><p></p><p>The same is true for these screws and for the fit to be exact. Going to bigger screws isn't to increase their shear strength (though it will do that too), it is to increase the install torque which increases the clamp loading. Bedding the bases to the action improves the fit, which improves the friction between them.</p><p></p><p>I used Johnson's paste wax for release agent when I bedded the mounts on a project rifle.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 1884902, member: 93138"] I think it is a mistake to view the mounting screws as being in shear. Any pins used are, but these screws aren't and if they are they won't live. They're there to clamp the bases to the action and it is the friction between those two surfaces that resists the recoil. Flywheel bolts aren't in shear, they aren't big enough nor are they numerous enough to transmit the crank's power. It is the clamp-load's friction between the flywheel and the crank flange that transmits the load. This is why the fit between the two surfaces is so important. It is also why the bolt's install torque is so critical. The same is true for these screws and for the fit to be exact. Going to bigger screws isn't to increase their shear strength (though it will do that too), it is to increase the install torque which increases the clamp loading. Bedding the bases to the action improves the fit, which improves the friction between them. I used Johnson's paste wax for release agent when I bedded the mounts on a project rifle. [/QUOTE]
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Nightforce front base keeps coming loose
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