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Cnc) Machinists on the Tasks of Cnc Machining Technology in Taiwan

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Cnc) Machinists on the Tasks of Cnc Machining Technology in Taiwan PERSPECTIVES OF COMPUTERIZED NUMERICAL CONTROL (CNC) MACHINISTS ON THE TASKS OF CNC MACHINING TECHNOLOGY IN TAIWAN DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of the Ohio State University By Chuan-Shou Hau, b .Ed ., M.S. The Ohio State University 1995 Dissertation Committee: Approved by Frank C. Pratzner Paul E. Post Michael L . Scott Adviser ^ College of Education UMI Number: 9533986 OMI Microform 9533986 Copyright 1995, by OMI Company. All rights reserved. This microform edition is protected against unauthorized copying under Title 17, United States Code. UMI 300 North Zeeb Road Ann Arbor, MI 48103 ACKNOWLEDGMENTS I would like to express my sincere appreciation to all those individuals who have encouraged me and assisted in the completion of this research study. My particular gratitude goes to my advisor, Dr. Frank C. Pratzner, for his professional guidance, support, and unending patience and time during this study. I also express my deepest thanks to Dr. Paul E. Post and Dr. Michael L. Scott, members of my doctoral committee, for their support and professional guidance. I would like to extend my thanks to Dr. E. Keith Blankenbaker, Dr. Lung Sheng Lee, Dr. James E. Sage, and Dr. Karen F. Zuga for their insight, professional knowledge and advice. I also would like to express a great deal of appreciation for my parents' encouragement, support, and visit; my wife's unconditional support and patience; my children's successful learning and achievement; and my brothers' assistance and encouragement. All the above have contributed immeasurablely to the completion of this study. Finally, special thanks also go to the Ministry of Education in the Republic of China for giving me funding to complete this study. ii VITA September 6, 1953 Born in Taiwan, Republic of China 1972 The Golden Award for Bench Work of IV National Skills Olympic Competition in Taiwan. 1973 The Silver Award for Bench Work of XXI International Skills Olympic Competition in Munich, West Germany. 1978-1979 Practicing assistant, Department of Industrial Education, National Taiwan Normal University, Taipei, Taiwan, R.O.C. 1979 B. Ed. (Industrial Education), National Taiwan Normal University, Taipei, Taiwan. R.O.C. 1979-1984 Teaching Assistant, Department of Industrial Education, National Taiwan Normal University, Taipei, Taiwan. 1984-present Instructor, Department of Industrial Education, National Taiwan Normal University, Taipei, Taiwan. 1989 MS.. (Technical Education), Pittsburg State University, Pittsburg, Kansas. 1989-1990 Secretary, Technological and Vocational Research Center, National Taiwan Normal University. PUBLICATIONS Hau, C. S. (1983). The optimum roughness of cutting conditions. Taipei: China Vocational Industrial Education Association. Hau, C. S. (1986). Lathe working Taipei: Chuan-hwa Book Company. Hau, C. S. (1986). Bench working Taipei: Chuan-hwa Book Company. Hau, C. S. (1992). Selecting desktop computer-aided manufacturing systems. Journal of Vocational Industrial Education. 1£(3), 41-45. FIELDS OF STUDY Major field: Education Studies in Technology Education Minor Field: Curriculum and Technical Education TABLE OF CONTENTS ACKNOWLEDGMENTS ..................................... ii VITA ................................................ iii LIST OF TABLES ...................................... vii LIST OF FIGURES ..................................... x CHAPTER PAGE I. INTRODUCTION................ 1 Nature of the Problem ........................ 1 Statement of the Problem..................... 4 Purpose of the Study ........ 7 Conduct of the Study ................. 8 Significance of the Study .... 11 Definition of Terms .......... 12 Assumptions .................. 14 Delimitations ................. 15 Limitations ................................. 16 II. LITERATURE REVIEW ............................ 17 Impact of Technology ...................... 19 Issues of Vocational Education ...... 31 Curriculum Development Rationales ........ 39 Description of CNC Machining Technology ...... 59 Summary of Literature Review .... 81 III. METHODOLOGY .................................. 84 Research Method ........................... 84 Procedures of the Study .................... 85 Established Potential Tasks .................. 88 Validated the Potential Tasks ..... 93 Design of the Questionnaire .................. 99 Data Collection ............................. 104 Data Treatment .............................. 106 Summary ..................... 106 v IV. DATA ANALYSIS, FINDINGS, AND DISCUSSIONS ....... 108 Overview ..................................... 108 Demographic Information .... 114 Analysis of Current Importance ............ 123 Analysis of Future Importance ................. 133 Discussions of Task Status .................... 143 Summary of the Findings ......... 164 The Results of Analysis ...................... 166 V. SUMMARY, CONCLUSIONS, AND RECOMMENDATIONS .... 176 Summary ....................... 176 Conclusion ................................... 180 Recommendations ................ 186 APPENDICES A. The Objectives/Content of the Numerical Control . {NC) Machine Tools Course in Taiwan .... 192 B. Task Inventory for CNC Machining Technology Identified by Document Analysis ............... 195 C. Chinese Language Version of Task inventory for CNC Machining Technology..... 202 D. The instrument of Content Validity for the Expert Panel .................................. 217 E. Members of the Expert Panels for Content Validation of the Survey Questionnaire ......... 228 F. English Language Version of the Questionnaire.... 231 G. Chinese Language Version of the Questionnaire ... 246 H. Personnel Assisting in Data Collection ......... 259 REFERENCES ........................................... 261 vi LIST OF TABLES TABLE PAGE 1. Potential Duty Areas and Duties of CNC Machining Technology .................................... 80 2. The Experience of the Five Qualified Experts ... 96 3. Level of Importance Scales and Their Mean Values . 107 4. Survey Response Rate by Each Company ........... 110 5. Usable Questionnaires from Each Company ....... 112 6. Grand Means on the Scales of Current and Future Importance by Means of Total Tasks ............. 113 7. Highest Degree Earned by Respondents ........... 115 8. Where CNC Machining Technology Was Learned ..... 116 9. Programs Attended by the Respondents to Learn CNC Machining Technology ....... 117 10. Number of Years of Work Experience ..... 119 11. Respondent Experience in CNC Machining ......... 120 12. Respondent Experience in CNC Programming........ 121 13. Classification of the Respondents by Experience in CNC Machining Technology ......... 122 14. Respondent Performance of CNC Machining and Programming ............... 123 15. Mean of the Five Duty Areas of CNC Machining Technology on the Scale of Current Importance .... 124 16. Tasks of CNC Machining Technology Ranked in Descending Order of Mean Ratings on the Scale of Current Importance ................ 126 17. Frequency of Tasks by Mean Ratings ..... 132 vii 18. Mean of the Five Duty Areas of CNC Machining Technology on the Scale of Future Importance ... 134 19. Tasks of CNC Machining Technology Ranked in Descending Order of Mean Ratings on the Scale of Future Importance ................ 136 20. Frequency of Tasks by Mean Ratings .............. 142 21. Changed Rank of the Tasks in the Duty of Preparing Required Data for Programming ...... 144 22. Changed Rank of the Tasks in the Duty of Selecting a CNC Machine Tool ................... 145 23. Changed Rank of the Tasks in the Duty of Writing a Manual Program in Word Address Format .. 147 24. Changed Rank of the Tasks in the Duty of Editing a Program With a Conversational Program Control Unit ..... 148 25. Changed Rank of the Tasks in the Duty of Generating a Program With CAD/CAM Systems ....... 149 26. Changed Rank of the Tasks in the Duty of Performing Preventive Maintenance ...... 151 27. Changed Rank of the Tasks in the Duty of Setting up a Workpiece ..................... 152 28. Changed Rank of the Tasks in the Duty of Setting up Tools and Holding Devices ........ 153 29. Changed Rank of the Tasks in the Duty of Loading Programs ..................... 155 30. Changed Rank of the Tasks in the Duty of Setting a Control Panel for Manual Data Input .... 156 31. Changed Rank of the Tasks in the Duty of Performing Required Operations in Response to Message of the Control Monitor ....... 157 32. Changed Rank of the Tasks in the Duty of Verifying a Program by Dry-Run Machine .......... 158 33. Changed Rank of the Tasks in the Duty of Machining the First Piece to Verify the Accuracy of Programs and Setup ............... 159 viii 34. Changed Rank of the Tasks in the Duty of Inspecting the First Part .................... 161 35. Changed Rank of the Tasks in the Duty of Machining Parts to Blueprint/Part Tolerance .... 162 36. Core Tasks and Supporting Tasks of CNC Machining Technology.............. 169 ix LIST OF FIGURES FIGURE PAGE 1. The scheme of the study ......... 9 2 . The scheme of the study results .......... 11 3 . The procedures of the literature review ........ 17 4. An algorithm for curriculum and instructional development ....... 42 5. The universal system model ..................... 44 6. Curriculum development in vocational-technical education ........................ 46 7. The process of the Delphi technique ............ 54 8. The procedures of the study .................. 86 9. The procedure of job analysis used in this
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