Patent ID: 8506357

Claim:
A method for grinding main bearings and pin bearings of a crankshaft using out-of-round grinding, comprising the following method steps: a) clamping the crankshaft in a grinding machine in a first clamping at one of a first location comprising two unground main bearings of the crankshaft, which two unground main bearings are spaced from one another in a common longitudinal extension of the two unground main bearings or at a second location comprising two end-side cylindrical segments located on a common longitudinal extension of the two unground main bearings; b) rotating the crankshaft about a rotational axis defined by the two unground main bearings that deviates from a determined geometric longitudinal axis of the crankshaft that runs through the main bearings; c) grinding the pin bearings to preselected final dimensions during rotation of the crankshaft with out-of-round grinding employing pin-chasing grinding implemented by CNC-control; d) positioning grinding wheels of the grinding machine during pin-chasing grinding according to the determined geometric longitudinal axis, using the deviation of the grinding wheels from the rotational axis as a correction value corresponding to the magnitude of deviation between the rotational axis and the determined geometric longitudinal axis so that a computer implementing CNC control effects grinding of the pin bearings according to the determined geometrical longitudinal axis of the crankshaft, measurements of the crankshaft defining the determined geometric longitudinal axis being transferred to the computer implementing the CNC control so that said computer can calculate said correction value; changing the clamping of the crankshaft to a second clamping in which the crankshaft is clamped at axial ends of the crankshaft and rotating the crankshaft about the determined geometric longitudinal axis; and grinding the main bearings to preselected final dimensions, using out-of-round grinding.