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.

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.