Modern Machinery (MM) Science Journal, November 2012

A MACHINE VISION APPROACH FOR AUTOMATED RAW PART ALIGNMENT IN MACHINE TOOLS

A. Mendikute, M. Zatarain
Keywords: raw part | alignment | 3D Vision

Large raw parts require a long time consuming process of alignment into the machine, before the machining process starts. Alignment process requires two steps: first, characterization of geometry, and second, alignment. Important skills are necessary, and, besides the time consumption of workforce and machine, the risk of getting into shortage of material is high. The paper presents a machine integ (…)

IMPROVING 5-AXIS MILLING OPERATIONS USING PROCESS MODELS

E. Budak
Keywords: process modeling | 5-axis milling

5-axis milling is a technology used in many industries such as aerospace, automotive and die/mold for machining of complex surfaces. Cutting forces, form errors and chatter vibrations are among the most important limitations in these operations. Process models can be used for predictions and optimization in 5-axis milling. In this paper, the process models and their applications are presented. Thes (…)

THREE-AXIS TOOL-PATH B-SPLINE FITTING BASED ON PREPROCESSING, LEAST SQUARE APPROXIMATION AND ENERGY MINIMIZATION AND ITS QUALITY EVALUATION

Changya Yan, Chenhan Lee, Jianzhong Yang
Keywords: tool path quality evaluation | point smoothing | shape preserving | B-spline fitting

Current state-of-art CAM systems generate piecewise linear (G01-based) tool paths that lack G1 and G2 continuity. This paper presents a systematic solution of tool path B-spline fitting for improving the continuity and quality and a tool set to evaluate the quality of either G-Code commands or CNC-interpolated axis motion commands. The core of the solution involves a preprocessor and a cubic B-Spl (…)

INTEGRATED MODELLING OF AXIAL MOTION ERROR SOURCES FOR 5-AXIS PRECISION MACHINING CENTRE WITH DIRECT DRIVES

J. Jedrzejewski, W. Kwasny
Keywords: error | power losses | direct drive | machining centre | Holistic model

This paper discusses machine tool modelling, comprising the design process, degradation and repair processes and accurate identification, aimed at the effective improvement of machine tools. The importance of the holistic approach to modelling for the accurate identification of machine tool errors and the ways in which they arise and for their minimization, taking into account thermal and dynamic i (…)