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Measuring to a large radius, short arc

I need to measure a dimension to the centerline of a radius, but the radius is 2" and only covers an arc of about 25 degrees. Measured on the optical comparator, the radius is nearly nominal, but on the CMM it measures 2.117". This throws my centerline over .100" out of position. How can I create a centerline from points on the radius using the nominal radius? Can I force PC-DMIS to best fit a 2" radius to points on the surface?
Parents
  • Could you type in the theoritical location of the first radius (ie create a point) or measure it, and in polar coordinates, take a few profile hits on the smaller radius and tolerance out the profile relative to the first rad?

    Keep in mind that I've not tried this but sounds like it should work.
Reply
  • Could you type in the theoritical location of the first radius (ie create a point) or measure it, and in polar coordinates, take a few profile hits on the smaller radius and tolerance out the profile relative to the first rad?

    Keep in mind that I've not tried this but sounds like it should work.
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