An apparatus for checking the diameter of crankpins of a crankshaft in the course of the machining in a grinding machine comprises a first arm rotating with respect to a support arranged on {HEAD ~ the grinding wheel slide} of {TAIL ~ the grinding machine}, a second arm rotating with respect to the first, a reference device carried by the second arm and a measuring device associated with a reference device 
An apparatus for checking the diameter of crankpins of a crankshaft in the course of the machining in a grinding machine comprises a first arm rotating with respect to a support arranged on { HEAD ~ the grinding wheel slide } of { TAIL ~ the grinding machine } , a second arm rotating with respect to the first , a reference device carried by the second arm and a measuring device associated with a reference device
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