Lesson 4/Learning Event
Learning Event
IDENTIFY TYPES AND USES OF MEASURING GAGES
In this lesson we will discuss the following measuring gages:
GAGES
Thickness (Feeler)
These gages are fixed in leaf form which allows you to check and measure
small openings such as valve clearances, narrow slots such as point gaps,
and so forth.
They are widely used to check the flatness of parts in
straightening and grinding operations and in squaring objects with a try
square.
Wire and Drill
Wire gages are used for gaging metal wire. A similar gage is also used to
check the size of hot and cold rolled steel, sheet and plate iron, and music
wire. Drill gages determine the size of a drill and indicate the correct
size of drill bit to use for a given tap size.
Drill number and decimal
size are also shown on this type gage.
Thread
Among the many gages used in machining and inspecting threads are center
gages and screw pitch gages.
a. The center gage is used to set thread tools.
Four scales on the
gage are used for determining the number of threads per inch.
b. Screw pitch gages are used to determine the pitch of an unknown
thread.
The pitch of a screw thread is the distance between the
center of one tooth to the center of the next tooth.
Small Hole Set
This set of four or more gages is used to check dimensions of small holes,
slots, grooves, and so forth.
The set can measure diameters from
approximately 1/8 to 1/2 inch.
Telescoping
These gages are used for measuring the inside size of slots or holes up to 6
inches in width or diameter.
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