Importance

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Abstract

A method of centering and thus balancing workpieces to be machined only in part comprises a provision of centering bores in and faces of the workpiece and/or a circular machining of peripheral surfaces on which the workpiece is adapted to the gripped. Before the workpiece is machined it is repositioned so that the rotary unbalance of the workpiece is reduced in that the position and/or mass distribution of the workpiece relative to its axis of rotation is changed. The workpiece is subsequently provided with the centering bores and/or with the surfaces to be gripped, which define the balanced and centered position of the workpiece and the associated axis of rotation. To permit a more economical final balancing of the workpiece when it has been machined the required change of the position and/or mass distribution of the workpiece is determined in that in the total rotary unbalance of the workpiece, on the one hand, and the rotary unbalance which is due to those portions of the workpiece which are to be machined, on the other hand, are determined, and that the rotary unbalance which is due to those portions of the workpiece which are intended not to be machined is subsequently determined by a computation from the rotary unbalances which have previously been determined.

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First Claim