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Precision Measuring

Precision Measuring. Precision Measuring. Precision – How close together or repeatable the results are A precise measuring instrument will give nearly the same result each time that it is used. Accuracy – How close a measurement is to the accepted value

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Precision Measuring

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  1. Precision Measuring

  2. Precision Measuring • Precision – How close together or repeatable the results are • A precise measuring instrument will give nearly the same result each time that it is used. • Accuracy – How close a measurement is to the accepted value • For example, a balance loaded with a standard 100 g weight should read 100 g. If it doesn’t, then the balance is inaccurate. Precision measuring tools are needed for accuracy

  3. Tools for Precision Measuring Steel Rule Micrometer

  4. Tools for Precision Measuring Digital Caliper Dial Caliper

  5. Reading a Dial Caliper The dial caliper is a precision measuring instrument. The caliper’s blade graduations are in inches and tenths (.1) of an inch. inch { Each inch is broken into ten, for .1 of an inch.

  6. Reading a Dial Caliper The caliper’s dial graduations are in thousandths (.001) of an inch. The reference edge keeps track of larger increments; the dial is for smaller increments.

  7. One full revolution of the pointer on the dial equals one hundred thousandths (.100).

  8. Dial Caliper Parts Inside Measuring Faces Clamp Screw Dial Blade Fine Adjustment Screw Dial Clamp Screw Outside Measuring Faces

  9. Reading a Dial Caliper 1 in. – 6 in. Step 1 Read inches from the blade 2

  10. Reading a Dial Caliper Step 2 Read tenths of an inch from the blade 3 2 .0 in. -.9 in. 1 in. – 6 in.

  11. Reading a Dial Caliper Step 3 Read thousandths of an inch from the dial 2 2 8 3 1 in. – 6 in. .0 in.- .9 in. .001 in.- .099 in.

  12. Dial Calipers Measure • Thickness or Outside Diameter

  13. Dial Calipers Measure • Thickness or Outside Diameter • Inside Diameter or Space Width

  14. Dial Calipers Measure • Thickness or Outside Diameter • Inside Diameter or Space Width • Depth

  15. Dial Calipers Measure • Thickness or Outside Diameter • Inside Diameter or Space Width • Depth • Step Distance

  16. Discussion Questions • What measuring tool would you use to measure the length of the hallway? • What measuring tool would you use to measure a pencil point diameter? • What measuring tool would you use to measure the height of your desk? • What measuring tool would you use to measure the width of your engineering notebook?

  17. Image Resources Microsoft, Inc. (2008). Clip Art. Retrieved October 10, 2008, from http://office.microsoft.com/en-us/clipart/default.aspx Wikimedia commons (2008). Retrieved October 15, 2008, from http://commons.wikimedia.org/wiki/ImageCaliper

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