Characteristics of motion errors of 3–Axis CNC vertical milling machines

This project presents a systematic approach to understand the different types of motion errors exist in Computer Numerical Controlled (CNC) machines. This research focused on five units of identical CNC milling machines, that is, the same brand, model and years of operation. As the increasing number...

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Main Author:	Ahmad Bakir, Azman
Format:	Thesis
Language:	English
Published:	2010
Subjects:	TJ Mechanical engineering and machinery TS Manufactures
Online Access:	http://eprints.utm.my/id/eprint/11280/1/AzmanAhmadBakirMFKM2010.pdf
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id	my-utm-ep.11280
record_format	uketd_dc
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery TS Manufactures
spellingShingle	TJ Mechanical engineering and machinery TS Manufactures Ahmad Bakir, Azman Characteristics of motion errors of 3–Axis CNC vertical milling machines
description	This project presents a systematic approach to understand the different types of motion errors exist in Computer Numerical Controlled (CNC) machines. This research focused on five units of identical CNC milling machines, that is, the same brand, model and years of operation. As the increasing number of CNC machines in manufacturing field, there is a need to ensure the machines are in good running condition. Machine tools such as CNC vertical milling machines are meant to produce precise workparts, therefore is important to maintain their accuracy. Periodic and preventive maintenance of the machine is crucial, whereby motion error inspection is one of predictive maintenance activities in ensuring CNC machines are in good working condition. The purpose of this project is to find out any abnormalities to the machine performance. The motion errors of CNC machines were analysed by using Double Ball Bar (DBB) measuring device. This equipment is designed to analyse the machine performance by measuring the accuracy of its movements. This device having two identical size balls at the end of the bar was mounted on spindle and onto a special holder which is mounted on the working table. The machine is made to move in a circular motion, clockwise and anti-clockwise in three planes, XY, YZ and ZX. Any deviation from the standard data will represent the imperfection of machine condition especially mechanical components such as slide bearing, spindle bearing or servo motor responses. Based on the study, DBB equipment has successfully captured the motion errors of five units of 3-axis CNC vertical milling machines. Diagnosis has been done and several error origins have been presented in this study. By knowing the most significant error origin, the corrective countermeasures can be carried out.
format	Thesis
qualification_level	Master's degree
author	Ahmad Bakir, Azman
author_facet	Ahmad Bakir, Azman
author_sort	Ahmad Bakir, Azman
title	Characteristics of motion errors of 3–Axis CNC vertical milling machines
title_short	Characteristics of motion errors of 3–Axis CNC vertical milling machines
title_full	Characteristics of motion errors of 3–Axis CNC vertical milling machines
title_fullStr	Characteristics of motion errors of 3–Axis CNC vertical milling machines
title_full_unstemmed	Characteristics of motion errors of 3–Axis CNC vertical milling machines
title_sort	characteristics of motion errors of 3–axis cnc vertical milling machines
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2010
url	http://eprints.utm.my/id/eprint/11280/1/AzmanAhmadBakirMFKM2010.pdf
_version_	1747814833522212864
spelling	my-utm-ep.112802018-05-30T02:35:10Z Characteristics of motion errors of 3–Axis CNC vertical milling machines 2010-04 Ahmad Bakir, Azman TJ Mechanical engineering and machinery TS Manufactures This project presents a systematic approach to understand the different types of motion errors exist in Computer Numerical Controlled (CNC) machines. This research focused on five units of identical CNC milling machines, that is, the same brand, model and years of operation. As the increasing number of CNC machines in manufacturing field, there is a need to ensure the machines are in good running condition. Machine tools such as CNC vertical milling machines are meant to produce precise workparts, therefore is important to maintain their accuracy. Periodic and preventive maintenance of the machine is crucial, whereby motion error inspection is one of predictive maintenance activities in ensuring CNC machines are in good working condition. The purpose of this project is to find out any abnormalities to the machine performance. The motion errors of CNC machines were analysed by using Double Ball Bar (DBB) measuring device. This equipment is designed to analyse the machine performance by measuring the accuracy of its movements. This device having two identical size balls at the end of the bar was mounted on spindle and onto a special holder which is mounted on the working table. The machine is made to move in a circular motion, clockwise and anti-clockwise in three planes, XY, YZ and ZX. Any deviation from the standard data will represent the imperfection of machine condition especially mechanical components such as slide bearing, spindle bearing or servo motor responses. Based on the study, DBB equipment has successfully captured the motion errors of five units of 3-axis CNC vertical milling machines. Diagnosis has been done and several error origins have been presented in this study. By knowing the most significant error origin, the corrective countermeasures can be carried out. 2010-04 Thesis http://eprints.utm.my/id/eprint/11280/ http://eprints.utm.my/id/eprint/11280/1/AzmanAhmadBakirMFKM2010.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering [1] S.H.H, Zargarbashi and J.R.R Mayer. A model based for centering double ball bae test results preventing fictitious ovalization effects. International Journal of Machine tools and manufacture. 2 March 2005 , pp. 1–8. [2] H.D. Kwan and Mr. Burdekin. Development and application of a system for evaluating the feed drive on computer numerical controlled machine tools.Elsevier Science Inc, 1996, p1-8 [3] H.L. Liu, H.M. Shi, B.Li, X.Li . A new method and instrument for measuring circular motion error of machine tools. International journal of machine tools and manufacture. 31 August 2004. P1-5 [4] Hua Qiu, Yan Li and Yan bin Li .A new method and demo for motor accuracy measurement of NC machine tools, Part 1 : principle and equipment. International Journal of machine tool and manufacture. 9 September 2000. Pg 1-14. [5] J.M Lai, J.S Liau and W.H. Chieng . Modeling and analysis of nonlinear guidance for double ball bar (DBB) measurement and analysis. Elsevier Science, 1997.pg 1-21 [6] J.M LAI, J-J LIAO and W.H Chieng. Modeling and analysis of nonlinear guide ways for double ball bar (DBB). measurement and diagnosis. Elservier science. 25 September 1995. Pg(1-21) [7] S.H.H, Zargarbashi and J.R.R Mayer, Assessment of machine tool trunnion axis motion error, using magnetic double ball bar. International Journal of machine tools and manufacturer. 15 November 2005. Pg(1-12) 123 [8] Shy-long Jen, Wei-hua Chieng and An Chen lee, Modelling and diagnosis of motion error of multi-axis machines using a ball bar test. Journal of dynamic system measurement and control. September 1996. Pg(1-9) [9] Renishaw’s inspection tools optimize VMC precision for HAAS, Renishaw Pg(1- 2). [10] Methods for performance evaluation of computer numerically controlled Machining centers ANSI/ASME b.5.54-1991. [11] Y.Kakino, Y.Ihara and A.Shinohara . Accuracy Inspection of NC Machine Tools by Double ball bar method. Hanser Publishers, Munich Vienna New York. [12] Circular test for numerical control machine tools, International Standard ISO 230- 4 , 1996 [13] A. Lamikiz, L.N. Lopez de lacalle and Lelaga, Machine tool performance and precision, 2009, Department of mechanical engineering, University of Basque Country, Springer [14] Junyong Xia, Youmin Hu, Yaqiong Lv, Bo Wu , Testing research on the thermal error characteristic of ball screw feed system, National key laboratory of digital manufacturing and equipment technology, Huazhong ,University of Science and Technology, Wuhan, 430074 [15] Ghasem Amirian, Transformation of tracking error in parallel kinematic machining, 2008 University Breman [16] W.Knapp, Test of Three Dimensional Uncertainty of Machine Tools and Machine Tools and Measuring Machines and its Relation to the Machine Error.(1983), 489. [17] W.Knapp, Circular Test for Three Coordinate Measuring Machines and Machine Tools, Precision Engineering, (1983),115. [18] W.Knapp, The circular test. S.Hrovat (1987). [19] W. Knapp, Accuracy of Length Measurement and Positioning: Static Measurement and Contouring Mode. Annals of Cirp,37,1 (1989), 511.

Characteristics of motion errors of 3–Axis CNC vertical milling machines

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