On the Generation of Coordinated Motion of Five-Axis CNC/CMM Machines

[+] Author and Article Information
Jui-Jen Chou, D. C. H. Yang

Department of Mechanical, Aerospace and Nuclear Engineering, University of California, Los Angeles, CA 90024

J. Eng. Ind 114(1), 15-22 (Feb 01, 1992) (8 pages) doi:10.1115/1.2899753 History: Received August 01, 1990; Revised January 01, 1991; Online April 08, 2008


This paper presents an analytical study on the command generation for five-axis CNC machining or CMM measurement. In the integration of CAD and CAM, it is necessary to relate machine tool kinematics and control in a CAM process to the geometrical data in a CAD model. The data stored in a CAD model is usually static in nature and represented by unitless parameters. Yet, in machine tool motion and control, the data should be transformed into a time dependent domain. In this paper, a general theory on the conversion from desired paths to motion trajectory is analytically derived. The geometrical properties of a desired path, including position, tangent, and curvature are related to the kinematics of coordinated motion including feedrate, acceleration and jerk. As a result, the motion commands used as control references to track arbitrary space curves for five-axis computer-controlled machines can be generated in a rather straight-forward as well as systematic way.

Copyright © 1992 by The American Society of Mechanical Engineers
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