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Rifles, Reloading, Optics, Equipment
Reloading
Calipers, micrometer, & dial indicator - one not like the others
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<blockquote data-quote="Winchester 69" data-source="post: 269115" data-attributes="member: 8037"><p>No measuring instrument needs to be zeroed to be used accurately. It IS necessary to adjust the reading by whatever error at zero exists. For what you are doing (measuring wall thickness of the brass necks), the ball micrometer is the appropriate instrument; additionally, it is the most accurate of the selection of instruments. </p><p></p><p>The calipers are the next most-accurate instrument type. The uniformity of the brass and your skill in making the measurement will influence the accuracy of their measurement. </p><p></p><p>I don't know how you are using a dial indicator to make this type measurement. It isn't surprising at all that the measurement doesn't agree with the others. Measuring wall thickness requires the use of a fabricated jig to provide an anvil and to hold the indicator. The design of the anvil would need to like that of the ball mic for the instrument to compensate for an unevenness in the metal's surface. </p><p></p><p>As mentioned, the ball mic is the proper instrument for making your measurement. If the anvils are at zero, then your measurement is correct as read. If the anvils are not at zero, then the measurement should be adjusted by the amount of error.</p></blockquote><p></p>
[QUOTE="Winchester 69, post: 269115, member: 8037"] No measuring instrument needs to be zeroed to be used accurately. It IS necessary to adjust the reading by whatever error at zero exists. For what you are doing (measuring wall thickness of the brass necks), the ball micrometer is the appropriate instrument; additionally, it is the most accurate of the selection of instruments. The calipers are the next most-accurate instrument type. The uniformity of the brass and your skill in making the measurement will influence the accuracy of their measurement. I don't know how you are using a dial indicator to make this type measurement. It isn't surprising at all that the measurement doesn't agree with the others. Measuring wall thickness requires the use of a fabricated jig to provide an anvil and to hold the indicator. The design of the anvil would need to like that of the ball mic for the instrument to compensate for an unevenness in the metal's surface. As mentioned, the ball mic is the proper instrument for making your measurement. If the anvils are at zero, then your measurement is correct as read. If the anvils are not at zero, then the measurement should be adjusted by the amount of error. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Calipers, micrometer, & dial indicator - one not like the others
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