{HEAD ~ 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 the grinding wheel slide of the grinding machine, a second arm rotating with respect to the first, a reference device carried by {TAIL ~ the second arm} and a measuring device associated with a reference device 
{ HEAD ~ 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 the grinding wheel slide of the grinding machine , a second arm rotating with respect to the first , a reference device carried by { TAIL ~ the second arm } and a measuring device associated with a reference device
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