Reading Measuring Tools

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Reading Measuring Tools
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Objectives

• Why do we use measuring tools?

• What tools will we use?

• How do we read measuring tools?

• Where are these tools used in industry?

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Activities

• Make measurements with rulers, calipers,
• and micrometers

• Complete a worksheet on measuring tools

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Why do we use measuring tools?
To ensure accuracy

• Measuring jigs before starting a job

• While working on a job

• To check dimensions after completing a job

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The Tools
Ruler / Tape
Calipers
Micrometers
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Ruler / Tape

• Least Precise

• Accuracy of 1/16 (.0625)

• Used on large items and non-precision work

• Available in various lengths

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Tapes Rulers

• Divided into increments of 1/16(standard)
• sometimes smaller

• Metric on the opposite side

• Bold numbers indicate inches

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Calipers

• 0 6 , 0 12 , 0 36

• Accuracy of .001

• Used on precision jobs

• Measures Outside Diameters, Inside Diameters,
• And Depths

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Parts of the calipers
clamp screw
nibs
bar
dial
jaws
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What are the 5 parts of the caliper ?

• Dial
• Jaws
• Nibs
• Bar
• Clamp Screw

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Reading Calipers

• Each increment on the bar represents .100

• Each round on the dial equals .100 or .200
• Depending on the brand of the tool

• Bold numbers on the dial represent .010

• Small dashes equal .001

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Micrometers

• Accuracy of .0001

• Most accurate

• Available in various sizes, from 0 1 up to
  35 36

• Used to measure Outside Diameters

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Parts of the micrometer
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What are the 5 parts of the micrometer ?

• Frame
• Thimble
• Sleeve
• Spindle
• Anvil

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Reading the micrometer
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An Example
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16
0.000
15
14
13
0.300
0.025
0.016
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Digital Calipers and Micrometers
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Digital Calipers and Micrometers

• Serves the same purposes as conventional
• Calipers and micrometers

• Easier to read due to digital read-out

• Usually more expensive

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Where are these tools used ?
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construction
Automotive
Machine Shops
Any Others ?
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Get out a sheet of paper . . .
Measuring Tools Quiz
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• Name the following tools

2.
1.
3.
4.
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• 5. What tool is the most accurate?
• What tool is the least accurate?
• What are the three things calipers are
• used to measure?
• Why do we use measuring tools?

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• Name this tool

9.

• What is one job that uses measuring
• tools that we discussed?

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BONUS ! !

• Name the 5 parts of the calipers .
• 1 point each

• Name the 5 parts of the micrometer .
• 1 point each