BEX Tutorial 11 - Form fitting data to a spherical form

An introduction to form fitting where surface form can be fitted and removed from data to allow the examination of the residual surface. In this example a mathematically perfect sphere is removed from surface measurement of a calibration sphere (essentially a large ball bearing with a precisely measured radius). Removing a a spherical form from the measurement reveals and the error that was present in the measurement system and was undetectable before the form removal. This is a little like peeling an orange and laying the skin flat!
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