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 {HEAD ~ a support} arranged on {TAIL ~ the grinding wheel slide} of 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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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 { HEAD ~ a support } arranged on { TAIL ~ the grinding wheel slide } of 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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