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Rifles, Reloading, Optics, Equipment
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<blockquote data-quote="Nimrod" data-source="post: 647083" data-attributes="member: 6327"><p>Most professionals can get fairly close with a good caliper but one of the first things they teach in machinist school (or used to anyway) is not to use a caliper for anything less than .005 tolerance. There is too much spring in even a good caliper and the tendency is to "help" it out a little, I watch people that should know better wiggle a caliper every day to "help it seat". If you give a micrometer to 3 different people who know how to use it you will likely get 3 different readings on a standard, a gauge block for instance, but they will be within a tenth (.0001) or 2 of each other. Give the same three people a caliper and the readings could vary by a thousandth or 2. A micrometer is simply more accurate and in a tight chamber .0002 can make a difference, I always use a micrometer to check case head expansion, they are simply more accurate. As for using the upper jaw, grab a gauge pin and try it tomorrow, as a tool maker I'll bet you'll be surprised just how close you can get. Sorry if I came off a little abrasive in the previous post, it was not my intention. </p><p></p><p>Bob</p></blockquote><p></p>
[QUOTE="Nimrod, post: 647083, member: 6327"] Most professionals can get fairly close with a good caliper but one of the first things they teach in machinist school (or used to anyway) is not to use a caliper for anything less than .005 tolerance. There is too much spring in even a good caliper and the tendency is to "help" it out a little, I watch people that should know better wiggle a caliper every day to "help it seat". If you give a micrometer to 3 different people who know how to use it you will likely get 3 different readings on a standard, a gauge block for instance, but they will be within a tenth (.0001) or 2 of each other. Give the same three people a caliper and the readings could vary by a thousandth or 2. A micrometer is simply more accurate and in a tight chamber .0002 can make a difference, I always use a micrometer to check case head expansion, they are simply more accurate. As for using the upper jaw, grab a gauge pin and try it tomorrow, as a tool maker I'll bet you'll be surprised just how close you can get. Sorry if I came off a little abrasive in the previous post, it was not my intention. Bob [/QUOTE]
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