Measuring Tools Part A

Question 1

What are the four types of steel rulers and there uses?

Answer 1

Spring tempered ruler-designed not to be bent. Accurate straight edge. Measures to 1/64 or .5mm

Flexible rule- made of thin stock used for measuring curves

Narrow rule-to be used in tight spaces

Hook rule-measure a chauffeur edge or line up with end of work piece

Question 2

What are the lines on a steel rule? What is the smallest measurement?

Answer 2

Graduations

Fractional inch rule 1/64
Decimal inch rule .010
Metric rule .5mm

Question 3

What are 3 common graduations?

Answer 3

Imperial inch
Decimal inch
Metric

Question 4

What 2 types of measuring tapes are there?

Answer 4

Short line - less then 30 ft

Long line - up to 60 ft

Question 5

What two tools are used for angular measurement? And what is there accuracy?

Answer 5

Plate protractor measure angles within 1 degree of accuracy

Universal bevel protractor. Measures angles within 5 minutes of a degree

Question 6

What are the angular measurement units?

Answer 6

Full circle 360 degrees
1 degree 60 minutes
1 minute 60 seconds

Question 7

What is the smallest increment the vernier scale can give you?

Answer 7

0. 001 inch or

0. 02mm

Question 8

What are the 3 types of precision callipers?

Answer 8

Vernier calliper
Dial calliper
Electronic digital calliper.

Question 9

What is a height gauge used for?

Answer 9

Height gauges are used for precision layout or for measuring how high a feature is above a flat surface.

Question 10

What are the 7 parts of a micrometer?

Answer 10

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Question 11

What is the pitch of a imperial micrometer? How far does the thimble move on a complete revolution?

What is the pitch on a metric micrometer?

Answer 11

Pitch=0.025”
.025 inch every revolution

Metric pitch= 0.5mm

Question 12

What is a intramik

Answer 12

An intramik uses three contact points to measure across the true diameter.

Question 13

What tool can be used to measure depth?

Answer 13

Micrometer depth gauge

Question 14

What are thickness/feeler gauges used for?

Answer 14

• Check bearing clearance or gear backlash
• Check tappers, spark plug gaps
• check clearances to fit piston rings and pins
• gauge gaps in narrow slots
• measure angularity in coupling shaft

Question 15

What is a taper gauge used for?

Answer 15

• determine the width of a slot

- measure angularity of a coupling shaft alignment

Question 16

Vernier bevel protractor graduations measure ______ minutes?

Answer 16

5 minutes (1/12degree)
Broke into 90 degree segments

Question 17

Reading a vernier bevel protractor?

Answer 17

Question 18

Checking the jaws of a vernier calliper is done by?

Answer 18

Close the jaws and hold up to the light. If you can see light through the jaws they are worn and need to be replaced

Question 19

How much pressure is applied to a vernier calliper?

Answer 19

Just enough pressure that the jaws remain in full contact with the workpiece

Question 20

Vernier scale imperial

Answer 20

Question 21

Metric vernier calliper

Answer 21

Question 22

How are vernier height gauges read?

Answer 22

Same as a vernier calliper

Question 23

What is the advantage of a 50-division vernier scale?

Answer 23

Half as many beam graduations as the 25-graduations making it much easier to read to .001” or .02mm

Question 24

Two ways to apply proper force to the micrometer?

Answer 24

1: close the micrometer with the ratchet stop until the ratchet stop clicks once.
2: close the micrometer by turning the the thimble until the feel is right.

Ratchet method is more consistent

Question 25

Reading a vernier micrometer

Answer 25

Question 26

Reading a vernier micrometer

Answer 26

Question 27

When reading a depth micrometer remember how to read the main scale? What is the difference from a normal micrometer?

Answer 27

You are reading the numbers you cannot see. Opposite of a normal micrometer
9 is visible meaning the first number would be .800”