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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Lapping a used scope
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<blockquote data-quote="LouBoyd" data-source="post: 616696" data-attributes="member: 9253"><p>I don't know what binding you might expect to notice. The question is if all of the mating surfaces when the bases, rings, or scope are properly torqued are in good contact. If they aren't in good contact they may change positiion from recoil or temperature changes. The scope will always have some stress on it and under recoil or large temperature changes the forces can be many pounds (or ft-lbs) either linear or as torque. That is normal. </p><p></p><p>How do you tell if the sufaces are properly mated when torqued? I use this type of material to check mating surfaces:</p><p><a href="http://www.tekscan.com/prescale-film" target="_blank">Prescale™ Pressure Indicating Film</a></p><p>There are several comparable brands. You can find this sort of film at most machinist supply stores. </p><p>Just cut a piece to the area you want to measure, Assemble and apply whatever pressure is to be measured, and disassemble it. The color intensity shows the peak pressure with good dimensional resolution and decent pressure resolution. </p><p>If there are areas of low or high pressure , particularly if they're asymmetrical and could warp the base or wobble, then bedding or lapping should give a better match and make the scope to bore alignment more stable. </p><p></p><p>Is it pointless to do it now?</p><p>It is very difficult to do it in the past. Procrastination is easiest.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 616696, member: 9253"] I don't know what binding you might expect to notice. The question is if all of the mating surfaces when the bases, rings, or scope are properly torqued are in good contact. If they aren't in good contact they may change positiion from recoil or temperature changes. The scope will always have some stress on it and under recoil or large temperature changes the forces can be many pounds (or ft-lbs) either linear or as torque. That is normal. How do you tell if the sufaces are properly mated when torqued? I use this type of material to check mating surfaces: [url=http://www.tekscan.com/prescale-film]Prescale™ Pressure Indicating Film[/url] There are several comparable brands. You can find this sort of film at most machinist supply stores. Just cut a piece to the area you want to measure, Assemble and apply whatever pressure is to be measured, and disassemble it. The color intensity shows the peak pressure with good dimensional resolution and decent pressure resolution. If there are areas of low or high pressure , particularly if they're asymmetrical and could warp the base or wobble, then bedding or lapping should give a better match and make the scope to bore alignment more stable. Is it pointless to do it now? It is very difficult to do it in the past. Procrastination is easiest. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Lapping a used scope
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