Object of the present invention is to provide an apparatus for the metrological checking of crankpins rotating with an orbital motion, in {HEAD ~ the course} of {TAIL ~ a grinding operation}, or in a similar one, that can provide good metrological performance, high reliability and small forces of inertia 
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Object of the present invention is to provide an apparatus for the metrological checking of crankpins rotating with an orbital motion , in { HEAD ~ the course } of { TAIL ~ a grinding operation } , or in a similar one , that can provide good metrological performance , high reliability and small forces of inertia
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