Abstract
Four-half axis and five-axis machine tools have five moving members (X, Y, Z, A, and B). Four-half axis systems cannot simultaneously operate the B axis with translational or rotational axes, thus limiting tool machining ability and complicating NC codes. This study employs modified Denavit-Hartenberg notation to model four-half axis machine tool kinematics and obtain corresponding ability matrixes. NC data equations for the A, B, X, Y, and Z axes with respect to the workpiece frame are derived by inverse kinematics. Machine tool active parameters and workpiece home position are simultaneously measured by using a ball-end milling cutter as a measuring probe.
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