Posted by Jim.ME on December 20, 2020 at 04:40:07 from (67.242.178.40):
In Reply to: Micrometer reading 101 posted by svcummins on December 18, 2020 at 13:28:20:
The edit feature does not work presently, due to issues between classic and modern views I believe, and has been discussed many times.
I already asked that question and SV has answered it. One turn moves 25 thousandths. The last picture of a General #102 mic is one I posted it to show the difference in the thimble graduations. That is one I consider graduated in thousandths on the thimble, with 25 marks around the circumference.
From the picture of the packaging I am guessing it is a General, that is not confirmed. General provides some good tools, at a reasonable price, which meet the needs of many. I have some of their tools, so I am not bashing them.
Some research of images reveals General had some, like SV's, with 50 marks around the thimble (with travel 25 thousandths per revolution). I call that graduated in .0005", even though packaging says graduations are .001" (Its not graduated in millimeters). Research also found General also had some carbide faced mics at one time. They may not have actually produced all the mics they sold. They may have had some branded from other sources, which could axplain the differences over the years. Many brands of "cheap" mics have .0005" graduations and carbide faces, so price doesn't always control what you get. Many are surprisingly accurate, at least in the beginning. How accurate they, or any mic, remain over the years can only be checked by regular calibration. I have seen "cheap" mics pass calibration and "expensive" ones fail.
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