1

Lesson 3

Part I

MICROMETER CONSTRUCTION

6

inside

7

We have said:

Calipers are being discussed because a micro-

outside

meter is a type of ________ .

The three basic parts of a caliper are its

_____ and an ___________ ___________ .

Calipers are designed for use in __________ or

______________ measurements.

12

scale

13

Our primary concern with the micrometer

0.001

___________ and the readings it presents is the

minimum

construction principle. This principle allows

loss

the transfer of measured dimensions to the mi-

crometer scales with a minimum loss in ________ .

18

threads

19

To express the pitch of the precision ______

per

in decimal form, you merely change the fraction

inch

1 to a decimal by diving the numerator (1) by

40

the denominator (40). This means that the pitch

in decimal form is ______ inch.

24

accurate

25

Look at foldout-18. Study the principal

pitch

components of the micrometer which are arranged

precision

to transfer the ______ ______ of the threads on

screw

the ______ ______ to the micrometer scales.

30

sleeve

31

The micrometer scale which is located on a

barrel

stationary micrometer component is the ________

thimble

or ________ scale. The scale which is located

scale

on a movable component of the micrometer is the

__________ __________ .

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