A39. Safety precautions that apply to extension cords:
Only use three-wire extension cords with three prong plugs.
Plug the tool into the extension cord before the extension cord is plugged
Replace damaged cords.
A40. Portable pneumatic power tools include pneumatic chipping hammers, rotary
and needle impact scalers, and portable pneumatic impact wrenches.
A41. Rotary and needle impact scalers are used for removing rust, scale, and old
paint from metallic and masonry surfaces.
A42. Safety precautions that apply to pneumatic tools include:
Wear the appropriate protective devices.
Only authorized and trained personnel should use pneumatic tools.
Pneumatic tools should be laid down in such a way that no harm will be
done if the switch is accidentally turn on.
Never point the air hose at another person.
A43. The title block is located in the lower right corner on all blueprints and
drawings prepared to military standards.
ANSWERS TO QUESTIONS FOR LESSON 2
A1. The different types of measuring tools are:
Rules and tapes
A2. Steel or wooden straightedge rules are used for short measurements. Tape
measures are used for longer measurements, up to 300 feet. Calipers are used
in conjunction with a scale to determine the thickness or diameter of a
surface, or the difference between surfaces.
A3. Handle rules and tapes carefully, and keep metal rules lightly oiled. Keep cal-
ipers clean and lightly oiled.
A4. The different types of micrometers are:
Outside micrometers, including screw thread micrometers
A5. Outside micrometers are used to measure outside dimensions, such as the di-
ameter of round stock or the thickness of flat stock. Screw thread
micrometers are used to determine the pitch diameter of screws. Inside
micrometers are used to measure the inside diameter of a pipe or hole. Depth
micrometers are used to measure the depth of a hole or recess.
A6. Keep micrometers clean and lightly oiled. Always keep micrometers in a case
A7. All measuring tools will be marked in some manner to comply with the stan-
dard inventory instructions found in OPNAVINST 4790.15.