precision measuring
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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 - PowerPoint PPT PresentationTRANSCRIPT
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Precision Measuring
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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
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Steel Rule
Micrometer
Tools for Precision Measuring
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Digital Caliper
Dial Caliper
Tools for Precision Measuring
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The dial caliper is a precision measuring instrument.
The caliper’s blade graduations arein inches and tenths (.1) of an inch.
Reading a Dial Caliper
inch
Each inch is broken into ten, for .1 of an inch.
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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
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One full revolution of the pointer on the dial equalsone hundred thousandths (.100).
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Blade
Inside Measuring Faces
Outside Measuring Faces
Dial
Fine Adjustment Screw
Dial Clamp Screw
Clamp Screw
Dial Caliper Parts
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Step 1 Read inches from the blade
1 in. – 6 in.
2
Reading a Dial Caliper
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Step 2 Read tenths of an inch from the blade
Reading a Dial Caliper
1 in. – 6 in. .0 in. -.9 in.
2 3
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Step 3 Read thousandths of an inch from the dial
Reading a Dial Caliper
1 in. – 6 in. .0 in.- .9 in. .001 in.- .099 in.
2 3 2 8
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Dial Calipers Measure
• Thickness or Outside Diameter
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Dial Calipers Measure
• Thickness or Outside Diameter
• Inside Diameter or Space Width
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Dial Calipers Measure
• Thickness or Outside Diameter
• Inside Diameter or Space Width
• Depth
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Dial Calipers Measure
• Thickness or Outside Diameter
• Inside Diameter or Space Width
• Depth
• Step Distance
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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?
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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