Cylindricity Error Measurement and Evaluation Based on Step Acceleration Algorithm in Crankshaft Measuring Machine

Determination of Geometrical Deviations of Large-Size Crankshafts with Limited Detection Possibilities Resulting from the Assumed Measuring Conditions

“…On the other hand, Pavlenko et al [14] presented a bench to determine the contour errors in the axial direction (such as obliquity, crowning and saddle shape) in the case of an agricultural tractor crankshaft. In a subsequent paper by Wang et al [15], a method of measuring and evaluating cylindricity error based on a step acceleration algorithm using a machine adapted to small crankshafts is described. The methods described in this paragraph refer to crankshafts fixed and unmoved on external journals [9] or fixed in tusks on a measuring machine [14,15].…”

“…In a subsequent paper by Wang et al [15], a method of measuring and evaluating cylindricity error based on a step acceleration algorithm using a machine adapted to small crankshafts is described. The methods described in this paragraph refer to crankshafts fixed and unmoved on external journals [9] or fixed in tusks on a measuring machine [14,15]. They therefore do not take into account the case of a crankshaft seated on supports, which is the subject of our paper.…”

“…Taking into account the imposed accuracy requirements, it should be stated that a comprehensive description of the geometrical state of a crankshaft requires the determination of contour deviations and the no less important deviations of axis position. Due to unavoidable errors resulting from the technological process of machining, misalignment is an inherent element accompanying crankshaft measurement procedures [15][16][17][18][19]. However, the resulting eccentric displacement of the main journals' axes during the rotation of a measured crankshaft mounted on an assembly of rigid prism supports makes the evaluation of its geometrical state unreliable.…”