Lesson 3/Practice Exercise Solutions

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LESSON 3

PRACTICE EXERCISE SOLUTIONS

Solution to Requirement 1.

First, you should determine that the reading is a minus (-) reading. The

next step is to read the number which the indicator hand has passed to the

left.

In this case, the number is 20 indicating a reading of .020 inch.

Now you must read the number of marks the indicating hand has passed. If

the indicating hand is aligned with a mark, that mark must also be counted.

In this case, the hand has passed three marks which gives a reading of .023

inch. Since the indicating hand past the third mark you must now divide the

distance between the third and fourth marks and make an estimate as to how

far past the third mark the hand has gone. Example: one-quarter, one-half,

or three-quarters of the way.

In this case, the hand is approximately

halfway between the third and fourth mark which now gives you a reading of -

.0235.

Solution to Requirement 2:

First, you should determine that this dial indicator is a continuous dial

type and will only read plus readings. Next you should go to the small dial

on the face of the large dial and read the number to the left

(counterclockwise). In this case, the hand has passed the numeral 9 which

gives a reading of .900 inch. Next you should have gone to the large dial

and read the number the indicating hand has passed to the right (clockwise).

In this case it had passed the 70, which now gives you a reading of .970

inch.

Now to complete the reading, you count the number of lines the

indicating hand had passed clockwise from 70. In this case, it has passed 4

and was aligned with the fifth which also must be counted for a total of 5

which now gives a reading of .975 inch.