1. Reading Measuring Tools

2. 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?

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

4. 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

5. The Tools
Ruler / Tape
Calipers
Micrometers

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

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

8. 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

9. Parts of the calipers
clamp
screw
nibs
bar
dial
jaws

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

11. 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”

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

13. Parts of the micrometer
sleeve
thimble
spindle
anvil
frame

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

15. Reading the micrometer

16. Largest sleeve reading
An Example
Smallest Measurement
Largest sleeve reading 15 17 16 14 13 18 19 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

17. Digital Calipers
and Micrometers

18. 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

19. Where are
these tools
used ?

20. construction
Automotive
Machine
Shops
Any
Others ?

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

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

23. 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?

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

25. 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