Abstract
Current computer-aided manufacturing (CAM) systems generate cutter contact points (CC points), cutter location points (CL points) and cutter orientation angles (CO angles) based only on the sculptured surface geometry. However, under certain conditions, the cutting errors of multiple-axis NC machines are larger than expected when using these CC, CL and CO data. This is because the cutting errors of multiple-axis NC machines depend on the machines structure data as well as on the geometry of the machined part. An algorithm is developed in this paper to estimate the cutting error and calculate the maximum allowable step length for table-tilting type four-axis NC machines. It is shown that the cutting error is proportional to the distance between the machined arc and the centre of the rotational axis. Therefore, the step length should be chosen to be smaller when the machined arc is displaced from the rotational axis.
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