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Rifles, Reloading, Optics, Equipment
Gunsmithing
When checking bolt-lug face surface % with a sharpie...
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<blockquote data-quote="J E Custom" data-source="post: 1643613" data-attributes="member: 2736"><p>Everyone probably has their preferred method to lap the bolt lugs.</p><p>I feel it is part of the accurizing/truing process and as such, follow a strict regiment that Includes lapping the lugs.</p><p></p><p>Before any lapping is done, the action must be trued to the bolt center line. Once all bolt surfaces are squared (Face, lugs and lug abutments) and threads are trued to the bolt center line, lapping can begin.</p><p></p><p>The best way (Most accurate way) is to use a spring loaded tool That pushes against the bolt face and uses the trued receiver face to square up on. This prevents the uneven lapping that can occur from bolt slack allowing the bolt to cock from applying pressure to the bolt handle.</p><p></p><p>I prefer using Blue die, but I guess a permanent marker would work.</p><p>I also prefer a minimum of 80% on all lugs and strive for 100 % of the contact surfaces. actions with uneven contact of the bolt locking lugs will cause uneven stress on the lugs and cause the bolt to move into an un square position during firing.</p><p></p><p>All action truing should be done before any barrel work is performed to get the optimum fit of the threads and final Head space.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1643613, member: 2736"] Everyone probably has their preferred method to lap the bolt lugs. I feel it is part of the accurizing/truing process and as such, follow a strict regiment that Includes lapping the lugs. Before any lapping is done, the action must be trued to the bolt center line. Once all bolt surfaces are squared (Face, lugs and lug abutments) and threads are trued to the bolt center line, lapping can begin. The best way (Most accurate way) is to use a spring loaded tool That pushes against the bolt face and uses the trued receiver face to square up on. This prevents the uneven lapping that can occur from bolt slack allowing the bolt to cock from applying pressure to the bolt handle. I prefer using Blue die, but I guess a permanent marker would work. I also prefer a minimum of 80% on all lugs and strive for 100 % of the contact surfaces. actions with uneven contact of the bolt locking lugs will cause uneven stress on the lugs and cause the bolt to move into an un square position during firing. All action truing should be done before any barrel work is performed to get the optimum fit of the threads and final Head space. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
When checking bolt-lug face surface % with a sharpie...
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