Reading Measuring Tools

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?

Make measurements with rulers, calipers, Activities Make measurements with rulers, calipers, and micrometers Complete a worksheet on measuring tools

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

The Tools Ruler / Tape Calipers Micrometers

Ruler / Tape Least Precise Accuracy of 1/16” (.0625”) Used on large items and “non-precision” work Available in various lengths

Tapes & Rulers Divided into increments of 1/16”(standard) *sometimes smaller Metric on the opposite side Bold numbers indicate inches

Measures Outside Diameters, Inside Diameters, Calipers Accuracy of .001” 0” – 6” , 0” – 12” , 0” – 36” Used on precision jobs Measures Outside Diameters, Inside Diameters, And Depths

Parts of the calipers clamp screw nibs bar dial jaws

What are the 5 parts of the caliper ? Dial Jaws Nibs Bar Clamp Screw

Each round on the dial equals .100” or .200” 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”

Micrometers Accuracy of .0001” Most accurate Available in various sizes, from 0” – 1” up to 35” – 36” Used to measure Outside Diameters

Parts of the micrometer sleeve thimble spindle anvil frame

What are the 5 parts of the micrometer ? Frame Thimble Sleeve Spindle Anvil

Reading the micrometer

Largest sleeve reading An Example Smallest Measurement Largest sleeve reading 15 17 16 14 13 18 0 1 2 3 19 0 1 2 3 4 5 6 7 8 9 18 17 0.000 16 15 14 13 0.300 0.025 0.016 0.341 inches One mark past largest sleeve reading Thimble Reading

Digital Calipers and Micrometers

Serves the same purposes as conventional Calipers and micrometers Digital Calipers and Micrometers Serves the same purposes as conventional Calipers and micrometers Easier to read due to digital read-out Usually more expensive

Where are these tools used ?

construction Automotive Machine Shops Any Others ?

Get out a sheet of paper . . . Measuring Tools Quiz

Name the following tools : 2. 1. 3. 4.

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?

9. Name this tool: What is one job that uses measuring tools that we discussed?

Name the 5 parts of the calipers . BONUS ! ! Name the 5 parts of the calipers . 1 point each Name the 5 parts of the micrometer . 1 point each