BEGIN CLASS IN 60 SECONDS

1. BEGIN CLASS IN 60 SECONDS 2000 John W. Nazemetz

2. BEGIN CLASS IN 50 SECONDS 2000 John W. Nazemetz

3. BEGIN CLASS IN 40 SECONDS 2000 John W. Nazemetz

4. BEGIN CLASS IN 30 SECONDS 2000 John W. Nazemetz

5. BEGIN CLASS IN 20 SECONDS 2000 John W. Nazemetz

6. BEGIN CLASS IN 10 SECONDS 2000 John W. Nazemetz

7. CLICK BEGIN !!! 2000 John W. Nazemetz

8. Let’s Begin … • Welcome to Week 7 Discussion • Agenda for Tonight: • Overview of Exam • Discussion Questions from Discussion Leaders • Other Questions from Students 2000 John W. Nazemetz

9. Exam Review (1) • Coverage -- • System/Operating Philosophies • Introduction to CIM, Future (1, 14) • Life Cycle Design Process • CAD Model as Starting Point for Analysis • Information Based Integration • Concurrent Engineering (4) • Computer Aided Process Planning (5) • Group Technology and Cellular Mfg. Sys. (12) • Flexible Manufacturing Systems (13) 2000 John W. Nazemetz

10. Exam Review (2) • Coverage -- • Task/Application Topics • CAD, Geometric Modeling (2, 3) • Representations/Transformations • Data Exchange to Other Functions • Computer Control of Manufacturing Systems (6, 8) • Numerical Control • Programmable Logic Controllers • Robotic Systems 2000 John W. Nazemetz

11. Key Concepts for Exam (1) • Computer Integrated Manufacturing • Definition -- Key Words/Meanings • Concepts -- Life Cycle Orientation/Viewpoint(s) • Concurrent Engineering • Definition and Goals • Comparison to “Traditional” • Computer Aided Process Planning • Variant/Generative/Group Technology • Surface Recognition/Process Association • Concurrent Engineering Process Design • Quality Deployment Function (QFD) • Quantitative Analysis -- Singh Model 2000 John W. Nazemetz

12. Key Concepts for Exam (2) • Group Technology • Definition and Philosophy • Coding Structures • Attributes Used • Use of Database Techniques vs. Coding • Family and Cell Formation • Production Flow Analysis • Similarity Indices • Procedures -- Linear Programming, Vakaria and Wemmerlov 2000 John W. Nazemetz

13. Key Concepts for Exam (3) • Cellular Manufacturing • Definition and Philosophy • Cell/Family Formation • Flexible Manufacturing Systems • Definition and Philosophy • Design Steps • Numerical Control • Definitions/Terms/Types/Programming • Relation/Types of CIM -- Cellular, FMS, Group Technology, etc. 2000 John W. Nazemetz

14. Key Concepts for Exam (4) • Robotics • Definitions/Terms/Types • Use and Justification of Use • Programmable Controllers • Definition/Use • !! NO Programming on this test !! 2000 John W. Nazemetz

15. What to Anticipate (Philosophy of Testing) • Seek to Test Understanding (not Rote Memorization) • Philosophy of Techniques • Ability to Convey Understanding of Concepts • Compare and Contrast • Mutually-Exclusive/Overlapping Concepts • When to Apply/When not to Apply • Limits to Accuracy/Applicability 2000 John W. Nazemetz

16. What to Anticipate (Types of Questions) • Essay (70-85%) • Compare/Contrast (All Combinations) • Pairwise Similarities and Differences • Differentiate • Pairwise Differences (Only) • Situation Described - Solicit Reaction • Situation Described - Solicit Approach/Analysis • Merge Concepts over Chapters • Quantitative (15-30%) • Calculation • Ability to Discuss Details of Algorithms 2000 John W. Nazemetz

17. Exam Logistics • On-Campus • Take on October 11, 1999 7-10 p.m. • Off-Campus • Take on October 11, 1999 7-10 p.m. • Call in with Questions • Via Tape • Arrange a 3 hour period with Kristi Horner (Arrange by 10/10 to take 10/11-13, if possible) • 405/744-05148 • She will Fax test to you, You Fax Back 3 hrs. Later 2000 John W. Nazemetz

18. Discussion Questions (Rahul Deshpande) 2000 John W. Nazemetz

19. Discussion Questions (Deshpande) • In homework problem 13.9, tool magazine capacity has not been mentioned. Do we need to assume the magazine capacity. Assuming different capacities mean variations in batch sizes. How do we go about assuming the magazine capacity? • Yes, you should assume one. Any value will do – most students used 5. 2000 John W. Nazemetz

20. Discussion Questions (Deshpande) • 2. Is there any specific criteria for selecting one Flexible Manufacturing System over the other. Is there a mathematical model/algorithm to arrive at these decisions. Does these criteria lead to the best manufacturing setup after it's implemented. • Cost – No Algorithms/Based on Estimates • Design, Conversion, Installation, Use, Service, Disposal • Remember – Use costs include “managerial complexity/support”, flexibility (savings), … 2000 John W. Nazemetz

21. Discussion Questions (Deshpande) • 3. Reference to the previous question, how we select either of conveyor, an AGV or a robot in a particular manufacturing setup. • Same way ($) – assess technical, operational, and economic feasibility. • Include tangible and intangible costs. • Use intangibles to “make up” any payback or ROI shortfalls. 2000 John W. Nazemetz

22. Discussion Questions (Sheng Ma) 2000 John W. Nazemetz

23. Discussion Questions (Sheng Ma) • How does FMS relate to continuous processes? For example, continuous processes in chemical industries? Which types of manufacturing systems should we assign to continuous process? • Consider a refinery – a continuous stream of product is produced but the mix/ratio of product(s) varies (e.g. heat oil, gasoline). The refinery can be thought of as a FMS handling different products (simultaneously). The mixed model analyses may be used or if the the equipment is a mix of common and dedicated (to product), a batching model can be used (Hwang plus extensions) with concepts of “key” machine (Vakaria and Wemmerlov) 2000 John W. Nazemetz

24. Discussion Questions (Sheng Ma) • 2. For operational problems in FMS, is there any comprehensive software or methods we could use? • Various software to (re)assess the design and operation, notably, family and cell formation algorithms. • Standard engineering practice/method: Define Problem, Gather Data, Generate Alternatives, Assess Alternatives, Select/Specify Solution, Implement, Reassess should suffice. 2000 John W. Nazemetz

25. Discussion Questions (Abhijit Hora) 2000 John W. Nazemetz

26. Discussion Questions (Abhijit Hora) • In the figure 13.1, the author has classified volume and variety of production in high, medium and low groups. Can we put these in numbers? Can theses numbers be put in a specific range in order to take into account the factors that affect definition of production and variety like process and product type? • Unfortunately no – while numbers of parts indicate economics, variation in product demand, configuration/design, market conditions impact as well and are independent of part volume (numbers). 2000 John W. Nazemetz

27. Discussion Questions (Abhijit Hora) • What is modular fixturing, the term used by the author (Singh) on page 540? • Two uses of term are common: • -- Base plate with attachments so that one can quickly develop fixtures for a variety of parts (job shop FMS) • -- One fixture that hold the set of parts that make up one unit/module of product – processing the “module” produces one part with no inventory, delay (Mixed Product FMS) 2000 John W. Nazemetz

28. Discussion Questions (Abhijit Hora) • What organizational changes are needed in an enterprise for adopting Flexible manufacturing systems? • Function of Starting point – • Ending point/Goal • Organization – Production Process Centric on Floor • Disciplined – Product Family Centric in Production Control, Marketing, Design 2000 John W. Nazemetz

29. Discussion Questions (Forth) 2000 John W. Nazemetz

30. Discussion Questions (Forth) • Could you clarify the differences in the Hwang and Extended (Stecke and Kim) Hwang Model? • Hwang (pg. 546) Max x = zi • Any part can enter solution, subject to tool capacity. • Stecke and Kim Max x = (bicdc)zi • Parts enter solution based on the tool(s) they use and the number of other parts that use the tool(s). • Constrained by tool capacity. 2000 John W. Nazemetz

31. Discussion Questions (Dennis McInerney) • Seagate -- 2000 John W. Nazemetz

32. Discussion Questions (Dennis McInerney) • I know there is no definite answer, but I have to ask -- Are there any numbers or range of numbers (volume and part quantities) associated with the volume-variety categories (H-L, L-H, M-M)? • Similar to question we saw from Hora, no universal answer, but there are industry common concepts. Generally, > 50 parts per batch is considered high in machine shops, 1-10 low. 2000 John W. Nazemetz

33. Discussion Questions (Class) • Other Questions as raised 2000 John W. Nazemetz

34. Discussion Session 7 • End of Class • Have a Good Week and I’ll see you next time! 2000 John W. Nazemetz