Ch. 6: Measurement Basics Flashcards
In the U.S. Customary System, measurements are either ______, ____, or _____
Whole numbers, fractional, decimal units
_____ is the standard unit of length
Meter
1mm equals ___ m
0.001
To convert inches to millimeters you _____ value by 25.4
Multiply
To convert millimeters to inches you ____ value by 25.4
Divide
The three rules are ____, ____, and _____
Metric, fractional inch, decimal inch
Standard inch-based micrometer measures to accuracy of ______
0.001”
Vernier inch-based micrometer provides accuracy of ____
0.0001”
The two systems of measurement commonly used in the machine trades are the _____ and ______
U.S. Customary, SI (International System of Units)
The standard unit of length in the metric system is the _____
Meter
Standard micrometers include ___ scales
2
_____ are the most common units used in metric machine drawings
Millimeters
_____ calipers are adjusted by pulling or pushing the legs to open or close them
Firm-joint
A(n) ______ is used primarily for measuring internal features, such as the diameter of holes
Telescoping gage
T or F: Small hole gages cover a measuring range of 1/8” to 1/2” distance
True
T or F: Measurements are expressed in whole number, fractional, or decimal units in the U.S. Customary System
True
T or F: 1mm is equal to 25.4”
False, 1inch is equal to 25.4mm
T or F: The smallest graduations on a 1/8” rule represent lengths of 1/32”
False
