Multi-point tool positioning strategy for 5-axis mashining of sculptured surfaces

Multi-point machining (MPM) is a tool positioning technique used for finish machining of sculptured surfaces. Ln this technique the desired surface is generated at more than one point on the tool. The concept and viability of MPM was developed by the current authors in previous works, However, the m ethod used to generate the multi-point tool positions was slow and labor in tensive. The objective of this paper is to present efficient algorithms to generate multi-point tool positions. A basic multi-point algorithm is prese nted based on some assumptions about the curvature characteristics of the s urface underneath the tool. This basic algorithm is adequate for simple sur faces but will fail for more complex surfaces typical of industrial applica tions. Accordingly, tool position adjustment algorithms are developed that combine the basic algorithm with non-linear optimization to achieve multi-p oint tool positions on these more complex surfaces. (C) 2000 Elsevier Scien ce B.V. All rights reserved.