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Rifles, Reloading, Optics, Equipment
Gunsmithing
Question on tenon size after threading...
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<blockquote data-quote="ntsqd" data-source="post: 2849674" data-attributes="member: 93138"><p>The first thing to know is that calipers lie to you when measuring the ID of a hole. The smaller the hole, the worse this is. Yesterday we had some tooling at work that was undersize. Starrett electronic calipers claimed the hole was .413", Fowler electronic calipers claimed that the hole was .415", Gauge pins say that the hole is .4245" Note that I don't report or consider the 4th place number that the calipers report - those are worthless because a caliper can not reliably measure that accuracy.</p><p>The problem is the shape of the jaws on the caliper. They all have a small flat on the face of the ID jaws. This is a necessary feature, but it does skew their measurements.</p><p></p><p>If you really need to know the size of the hole you need either an ID micrometer or some skill and a set of snap-gauges with a std. micrometer.</p><p></p><p>None of which solves the problem. I'd buy an NSS lug and move on. That's assuming that the barrel threads into the action?</p></blockquote><p></p>
[QUOTE="ntsqd, post: 2849674, member: 93138"] The first thing to know is that calipers lie to you when measuring the ID of a hole. The smaller the hole, the worse this is. Yesterday we had some tooling at work that was undersize. Starrett electronic calipers claimed the hole was .413", Fowler electronic calipers claimed that the hole was .415", Gauge pins say that the hole is .4245" Note that I don't report or consider the 4th place number that the calipers report - those are worthless because a caliper can not reliably measure that accuracy. The problem is the shape of the jaws on the caliper. They all have a small flat on the face of the ID jaws. This is a necessary feature, but it does skew their measurements. If you really need to know the size of the hole you need either an ID micrometer or some skill and a set of snap-gauges with a std. micrometer. None of which solves the problem. I'd buy an NSS lug and move on. That's assuming that the barrel threads into the action? [/QUOTE]
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Question on tenon size after threading...
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