222 Agricultural Mechanics and Technology Systems
Copyright Goodheart-Willcox Co., Inc.
6. A drill _____ is used to arrange drill bits by size and to store them in a convenient and
safe manner.
A. jig
B. index
C. chuck
D. punch
7. Explain why many drills are capable of operating at variable speeds.
8. The development and use of cordless _____ drivers to drive screws has replaced the use of
a hammer and nails for many construction applications.
9. A nail gun with a(n) _____ trigger incorporates a sliding safety tip that must be cycled and
depressed each time a nail is delivered.
10. Pipe benders use _____ power to shape pipes between rollers and a mandrel.
11. Saw blades that, instead of blade set, use teeth tips that are thicker than the body of the
blade to create clearance during a cut are called _____.
12. Circular saw blade teeth tipped with sharp inserts made from _____ greatly extend the
useful life of the blade, in part by increasing the length of time a blade will retain its
sharpness.
A. copper
B. bronze
C. aluminum
D. tungsten carbide or titanium carbide
13. Miter saws are used to make straight and angled cuts _____ the grain of the lumber.
14. True or False? In general, saw blades designed to cut harder materials have more teeth per
inch than blades designed for softer materials.
15. When using a(n) _____ router, you can lower the bit into the center of the board surface to
create a cut that does not extend to the edge.
16. How are the abrasive materials for grinders formed?
17. The _____ of a bench grinder should always be kept adjusted to within 1/8″ from the
working surface the grinding stone.
18. All power tools sold in the United States are required by law to meet safety standards set
forth by the _____.
19. List three rules for keeping power tools in optimum condition.
20. True or False? The plastic or metal boxes in which portable power tools are sold should
never be used for storing the tools.
STEM and Academic Activities
1. Science. Use a microscope or strong magnifying lens to examine the surface of a new
sanding disc. Then examine a sanding disc that is worn. What differences do you see?
How will this affect their usefulness?