Abstract: A method for verifying the accuracy of a CNC machine or a CMM. The methodology segregates the measured error into an assignable cause portion and a common cause (or random error) portion. The methodology may be employed to affect the calibration of the machine tool to factor out the mean value of the assignable cause portion. Inherent in this methodology is the ability to diagnose mechanical problems with the CNC machine or CMM that affects the repeatability and accuracy of such machine tools; identify degradation in the performance of such machine tools that is indicative of mechanical failure; and improve the accuracy and repeatability of such machine tools in certain situations.

Abstract: A balancing process for crankshafts that are assembled from a plurality of precisely machined, forged parts, in which the balancing process connects both revolving and reciprocating imbalances, allowing for optimum balancing conditions, which exceed the normal 50% balancing limit for weights that involve reciprocating unbalance. In this process, a substitute weight is positioned between two counterweight discs, that are part of corresponding sub assemblies of a temporary assembled crankshaft, with the substitute weight occupying the space normally occupied by the big end pin. The temporary assembled crankshaft, is placed on a dynamic balancing machine, and any imbalance is corrected. The connecting rod, prior to being assembled in the crankshaft, is balanced by placing the connecting rod on a weighing scale, that has been calibrated to zero position, using a master connecting rod of a known center of gravity.