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measuring a countersink

Good evening Pcdmis masters, I`m fairly new to Pcdmis, and i would love to get some help , I am trying to measure a Countersink Dia at the intersection of the top surface on this part, the available area is very limited and the thread leads are not clocked to the model to get an auto cone reading accurately, is there any method i can use to first identify the rotation of the the double lead thread and then construct a cone avoiding the thread lead`s in order to get an accurate reading? any tips will be appreciated ,thanks in advance
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  • I get these often too & if they are on the smallish side I skip wasting time on the CMM & use optical comparator. If the part is too large setting 2 calipers on min & max size works well. For the angle I bought an angle gauge set long time ago & it does the job. There are some things that other tools will do faster & better job than the CMM still.
  • I wish I could do that, the top surface Of this plate is a radius and some part # an spline , a vision system is actually reading this diameter about .040 microns smaller than the actual CMM reading, i also tried reprorubber and it was 003 microns different then the Cmm.
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