measuring a rotated radius

I'm new to the CMM world and we're trying to measure a rotated radius (picture a cone with a concave wall.) Anything I've tried so far, short of making a jig, doesn't guarantee that a cross section is truly representative of the radius I'm trying to measure. We're using a Romer PCMM with PC-DMIS 4.3. Oh yeah, and position of the radius to a perpendicular surface is critical as well.

Thanks,
Matt

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Robert Masters over 15 years ago

Personally, I don't like to measure "part" of a circle, unless enough is available that I can have a reasonable amount of confidence with the results.

Also, if the cicular (radius) feature isn't very round, then the results can become failrly meaningless.

If the locus of that radius is well enough defined, then oribit around the conical feature at pre-determined rotations, and scan from the nominal radius centerline (locus) to the radius surface using multiple measurements at each rotation.

I can make another diagram if necessary.
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Robert Masters over 15 years ago

Personally, I don't like to measure "part" of a circle, unless enough is available that I can have a reasonable amount of confidence with the results.

Also, if the cicular (radius) feature isn't very round, then the results can become failrly meaningless.

If the locus of that radius is well enough defined, then oribit around the conical feature at pre-determined rotations, and scan from the nominal radius centerline (locus) to the radius surface using multiple measurements at each rotation.

I can make another diagram if necessary.
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