MACHINE SHOP CALCULATION - OD1640 - LESSON 2/TASK 1
2.
Linear Measure
a.
General.
Linear measure is the measurement of line distance.
In
machine shop calculations, it is important to know how to convert linear
measurements from the English to the metric system and vice-versa.
Subsequent paragraphs provide an explanation of both these systems and how
to convert from one system to another.
b.
English System.
This system consists, basically, of the inch, foot,
yard, and mile.
The foot is the basic unit of measure.
The inch is a
subdivision of the foot, while the yard and the mile are multiples of the
foot. Table 2 below depicts the English system.
TABLE 2.
ENGLISH SYSTEM LINEAR MEASUREMENTS.
12 inches (in)
=
1
foot (ft)
3 feet (ft)
=
1
yard (yd)
5280 feet (ft)
=
1
mile
1760 yards (yd)
=
1
mile
c.
Metric System. This system is based on the decimal system, just like
the United States dollar (10 cents equals a dime, and 10 dimes equal one
dollar). The meter is the basic unit of measurement, as depicted in Table 3
below. As shown in this table, units that are multiples or fractional parts
of the meter, such as the millimeter, are designated as such by prefixes to
the word meter.
TABLE 3.
METRIC SYSTEM LINEAR MEASUREMENTS.
10 millimeters (mm)
=
1
centimeter (cm)
10 centimeters (cm)
=
1
decimeter (dm)
10 decimeters (dc)
=
1
meter (m)
1000 meters (m)
=
1
kilometer (km)
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