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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="ntsqd" data-source="post: 1643670" data-attributes="member: 93138"><p>What it means, if I understood their description correctly, is that the bolt has .012" clearance out of battery, i.e. while being slid fore/aft. Plenty of dirt clearance. As the bolt handle closes it "cams" and that clearance is reduced to nothing when fully in battery. Meaning that that there is no vertical, and possibly horizontal, movement possible at the rear of the bolt. If this geometry is achieved then there is no vertical movement of the rear of the bolt at sear release either.</p><p></p><p>I'm sure that there are plenty of benchrest smiths out there who believe that no lapping should be done.I'm also quite sure that the folks who do true precision alignment of extreme precision components (think laser, optical, silicon wafer, things like that) where the tolerances are in the millionths of an inch (and that isn't their unit of measure) or smaller would laugh at that notion. I would estimate that a good hand at an excellent lathe can hold .0001" at best. To hold tolerances 10 times smaller than that requires grinding, lapping, or possibly scraping.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 1643670, member: 93138"] What it means, if I understood their description correctly, is that the bolt has .012" clearance out of battery, i.e. while being slid fore/aft. Plenty of dirt clearance. As the bolt handle closes it "cams" and that clearance is reduced to nothing when fully in battery. Meaning that that there is no vertical, and possibly horizontal, movement possible at the rear of the bolt. If this geometry is achieved then there is no vertical movement of the rear of the bolt at sear release either. I'm sure that there are plenty of benchrest smiths out there who believe that no lapping should be done.I'm also quite sure that the folks who do true precision alignment of extreme precision components (think laser, optical, silicon wafer, things like that) where the tolerances are in the millionths of an inch (and that isn't their unit of measure) or smaller would laugh at that notion. I would estimate that a good hand at an excellent lathe can hold .0001" at best. To hold tolerances 10 times smaller than that requires grinding, lapping, or possibly scraping. [/QUOTE]
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When checking bolt-lug face surface % with a sharpie...
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