Manual Systems Computer Aids Variant System Experimental Generative System

1. COMPUTER AIDED PROCESS
PLANNING
Dr.M. Bala Theja,M.Tech,Ph.D
Associate Professor
Department of Mechanical Engineering

2. What is CAPP

3. Process Plan

4. Process Planning

5. Basic Process in developing a
process plan

6. Process Planning Approaches
 Manual Systems
 Computer Aids
◦ Variant System
◦ Experimental Generative System

7. Manually Prepared Process
Plans

8. Computer Aids

9. Variant (Retrieval) CAPP
Methodology

10. Variant CAPP

11. Variant CAPP

13. Variant CAPP

14. Generative CAPP
Methodology

15. Knowledge based process
planning

16. Kendall & Kendall 9-16
Decision Tables
• A table of rows and columns, separated
into four quadrants
• Conditions
• Condition alternatives
• Actions to be taken
• Rules for executing the actions

17. Kendall & Kendall 9-17
Figure 9.8 The standard format
used for presenting a decision table

18. Kendall & Kendall 9-18
Developing Decision Tables
• Determine conditions that affect the decision
• Determine possible actions that can be taken
• Determine condition alternatives for each condition
• Calculate the maximum number of columns in the
decision table
• Fill in the condition alternatives
• Complete table by inserting an X where rules suggest
actions
• Combine rules where it is apparent
• Check for impossible situations
• Rearrange to make more understandable

19. Kendall & Kendall 9-19
Figure 9.10 Constructing a decision table for deciding
which catalog to send to customers who order only from
selected catalogs

20. Kendall & Kendall 9-20
Checking for Completeness and
Accuracy
• Four main problems
• Incompleteness
• Impossible situations
• Contradictions
• Redundancy

21. Kendall & Kendall 9-21
Figure 9.14 Checking the decision table for
inadvertent contradictions and redundancy is
important

23. Types of Decision Table