TECH 103 Materials & Processes

Assignment #1 - Fall 2007

1. What are the international standards of length and how are they established?
2. What organization is responsible for establishing international measurement standards? What organization in the USA is responsible for establishing measurement standards?
3. What is the difference between precision and accuracy?
4. What are gage blocks? Describe several uses for gage blocks.
5. Why is it important that temperature be taken into account during the measurement process?
6. To what level of precision can an inch-based (a) steel rule, (b) micrometer, and (c) vernier caliper be read?
7. What are the advantages and disadvantages of fixed gauges?
8. What are the advantages and disadvantages of a micrometer?
9. What is the difference between gaging and measuring?
10. What is a go-nogo gage and why is it often used in a high production environment?
11. In what units is surface roughness specified in the (a) SI and (b) American Engineering systems?
12. How is surface roughness measured? Name several ways this can be done.
13. What height gage block would you put under one end of an 8" sine bar to make an angle of (a) 17.6° (b) 33.5° (c) 55.0° ?
14. What angle does a 12" sine bar make with a gage block under one end that is (a) 3.125", (b) 1.870", (c) 7.250" high?
15. Do the bolt circle supplemental problems handout.