3. Precision Measuring Tools The Ruler The Micrometer The Dial Caliper Each tool can measure things in smaller and smaller increments From larger increments-the Ruler distances in inchs, to very small increments distances in thousandths of an inch-the Dial Caliper

7. The dial caliper is:a precision measuring instrument. The caliper’s blade graduations are: in inches and tenths (.1) of an inch. The caliper’s dial graduations are: in thousandths (.001) of an inch. One full revolution of the pointer on the dial equals: one hundred thousandths (.100).

8. Precision Measurement To measure something precisely you are making the measurement and comparing it to some accepted dimension or number called the Standard When something is measured Accurately you get the same number every time. Measurements can be Accurate but not Precise

10. Blade Inside Measuring Faces Outside Measuring Faces Dial Fine Adjustment Screw Dial Clamp Screw Clamp Screw

11. Precision Technical Drawings Go back to the previous slide and draw the Dial Caliper in your engineering notebook, making sure to label all of the parts.

12. Step 1 Step 2 Step 3 Read inches Read tenths of an inch Read thousandths of an inch Blade(0”-6”) Blade(.0”-.9”) Dial (.000”-.099”) 2 3 028 2 328Now add…

13. Step 1 Step 2 Step 3 Read inches Read tenths of an inch Read thousandths of an inch Blade 1”-6” Blade.0-.9” Dial.001”-.099” 232 8

14. Reading a Caliper Practice Step 1 Read inches 4 Step 2 Read tenths of an inch.5 Step 3 Read thousandths of an inch.007 The new dial reading is?_________

15. Team Practice-50 pts. Step 1 make up 3 caliper readings that includes inches, tenths of inches and thousandths of inches. 10 pts Step 2 give your 3 caliper readings to your partner 5 pts. Step 3 after 5 minutes collect your caliper readings and check the results with your partner (did they record the reading correctly) 15 pts. Step 4 jot down a note about what you and your partner learned about precision instruments and reading a dial caliper. 20 pts.

16. Dial Caliper Practice The new dial reading is 4.507