d. Care of thread chasers. Never attempt to sharpen thread chasers yourself
as this is a highly specialized cutting process and involves precision work on hard
tool steel of a shape altogether not suited for simple stroking on an oilstone.
Store chasers carefully when not in use. Coat with a light film of oil and case
individually so that the cutting edges do not touch other metal. For long periods
of storage, coat chasers with a rust-preventive compound and store in a dry place.
15. SAFETY. Because of high pressures and temperatures found in some types
of equipment extreme caution must be taken. A few safety rules are:
a. Shut off all steam lines and remove pressure before attempting maintenance.
b. Allow lines to cool before working on them.
c. Insulate exposed steam lines within easy reach of personnel to prevent
burns.
d. Do not permit smoking in the area when installing or repairing fuel lines.
e. Test all lines before use.
EXERCISE
22.
What would be the advisable bending radii for a 1/2-inch iron pipe?
a.
1-3/4 inches
b.
3-1/4 inches
c.
2-1/2 inches
23.
What is used with the die block to make a double flare in the ends of tubing?
a.
Flanging tool
b.
Double cutter
c.
Yoke and adapters
24.
How often is the pipe cutter handle rotated when cutting pipe?
a.
Quarter turn clockwise for each complete revolution
b.
Quarter turn counterclockwise for each complete revolution
c.
Just keep tight enough to prevent cutters from slipping
25.
What is used to prevent solid reamers from chattering?
a.
Evenly spaced lands
b.
Spiral flutes
c.
Irregularly spaced lands
26.
What caution should be taken when using a reamer?
a.
Do not turn the wrench clockwise
b.
Use solid straight hole reamer for work not requiring accuracy
c.
Do not turn the wrench counterclockwise
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