1. Explain the different steps in finishing and machining castings.

2. How are the castings made to exact size?

3. What is high-speed steel? Why is it very useful in the machinists' trade?

4. What is chipping and filing?

5. What is the meaning of "benchwork" in the machine-shop?

6. Is it necessary to use mathematical instruments in doing machine-work? Why?

7. Describe a micrometer. How is it used? Does the heat of the hand affect it?

8. Name some machine tools built on the principle of rotary motion; reciprocating motion.

9. Which is the most economical tool, so far as the energy put into it and the useful work it will do is concerned?

FIG. 204. - Die-sinking.

10. Upon what does the cutting capacity of a machine depend?

11. Define the following expressions: "cutting feed of a tool," "depth of cut," "cutting speed."

12. Is it possible to cut all metals at the same rate of speed? Explain.

13. Why is it necessary to have different speeds on a machine tool? How are different speeds obtained?

14. What is a lathe? Explain the difference in action and uses of different lathes.

15. What is meant by the expression "size of a lathe"? Why is it important?

16. What is a simple lathe? Compound lathe?

17. What is a lathe tool?

18. Describe a machinist's vise.

19. What is a screw machine? Explain its action.

20. What is a drilling machine? Explain its action.

21. What is a shaper? What is a planer? How do they differ in use and action?

22. What is a key-way machine?

23. Explain the Purpose of a milling machine. Describe its action.

24. What is a grinding tool?

25. Describe the different kinds of power hammers.

26. Explain the use and action of a vernier.

27. What is a screw pitch gauge? Thickness gauge?

28. What is the difference between a general machinist tool-maker and die-sinker? Name some of the principles of science that a general machinist should know in order to understand and do his work intelligently.