TECH 103 Materials & Manufacturing Processes

Assignment #2 - Fall 2008

1. Why is the inspection of manufactured parts necessary?
2. Define the following terms:

(a) tolerance

(b) allowance

(c) clearance

(d) interference

3. Name three different tolerancing systems and sketch an example of each type.
4. How many classes of fit for cylindrical parts does ANSI specify? List the abbreviations and name of these classes.
5. What is selective assembly? What are the advantages and disadvantages of this process? Describe this process and tell what condition(s) would make the use of this process necessary.
6. What is overdimensioning? What is the end result of overdimensioning? How can this problem be avoided?
7. What is geometric dimensioning and tolerancing (GD&T)? Name and draw the symbol for five geometric conditions that can affect quality.
8. Why is baseline dimensioning being used to an increasing extent in modern industry?