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Roundness measurement
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'''Roundness measurement''', determining how much something departs from being a perfect circle, is essential in metrology. It includes measurement of a collection of points.

== Methods ==
Two fundamental methods are followed &mdash; the intrinsic datum method, and the extrinsic datum method.

=== Intrinsic datum method ===
(contracted; show full)
* Minimum circumcised circle (MCC): It is defined as the smallest circle which encloses whole of the roundness profile. Here the error is the largest deviation from this circle
* Maximum inscribed circle (MIC): It is defined as the largest circle that can be inscribed inside the roundness profile. The roundness error here again is the maximum deviation of the profile from this inscribed circle.

[[Category:Metrology]]
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[[Category:Resources last modified in June 2012]]