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
Steel Rule Micrometer Tools for Precision Measuring
Digital Caliper Dial Caliper Tools for Precision Measuring
The dial caliper isa precision measuring instrument. The caliper’s blade graduations are in inches and tenths (.1) of an inch. Reading a Dial Caliper inch Each inch is broken into ten, for.1 of an inch. {
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. Reading a Dial Caliper
One full revolution of the pointer on the dial equals one hundred thousandths (.100).
Blade Inside Measuring Faces Outside Measuring Faces Dial Fine Adjustment Screw Dial Clamp Screw Clamp Screw Dial Caliper Parts
Step 1 Read inches from the blade 1 in. – 6 in. 2 Reading a Dial Caliper
Step 2 Read tenths of an inch from the blade Reading a Dial Caliper 1 in. – 6 in..0 in. -.9 in. 2 3
Step 3Read thousandths of an inch from the dial Reading a Dial Caliper 1 in. – 6 in..0 in.-.9 in..001 in in
Dial Calipers Measure Thickness or Outside Diameter
Dial Calipers Measure Thickness or Outside Diameter Inside Diameter or Space Width
Dial Calipers Measure Thickness or Outside Diameter Inside Diameter or Space Width Depth
Dial Calipers Measure Thickness or Outside Diameter Inside Diameter or Space Width Depth Step Distance
Discussion Questions List measurement tools… Steel RuleTape Measure Dial CaliperMeter Stick Explain which one of the tools listed would be best to use and why when measuring: –The hallway –Engineering Notebook –Pencil diameter –Height of your desk
Image Resources Microsoft, Inc. (2008). Clip Art. Retrieved October 10, 2008, from Wikimedia commons (2008). Retrieved October 15, 2008, from