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

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Precision Measuring

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Precision measuring

Precision Measuring


Precision measuring1

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


Precision measuring

Tools for Precision Measuring

Steel Rule

Micrometer


Precision measuring

Tools for Precision Measuring

Digital Caliper

Dial Caliper


Precision measuring

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.


Precision measuring

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.


Precision measuring

One full revolution of the pointer

on the dial equals

one hundred thousandths (.100).


Precision measuring

Dial Caliper Parts

Inside Measuring Faces

Dial

Clamp Screw

Blade

Fine Adjustment Screw

Dial Adjustment Screw

Outside Measuring Faces


Precision measuring

Reading a Dial Caliper

1 in. – 6 in.

Step 1

Read inches from the blade

2


Precision measuring

Reading a Dial Caliper

Step 2

Read tenths of an inch from

the blade

3

2

.0 in. -.9 in.

1 in. – 6 in.


Precision measuring

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.


Dial calipers measure

Dial Calipers Measure

  • Thickness or Outside Diameter


Dial calipers measure1

Dial Calipers Measure

  • Thickness or Outside Diameter

  • Inside Diameter or Space Width


Dial calipers measure2

Dial Calipers Measure

  • Thickness or Outside Diameter

  • Inside Diameter or Space Width

  • Depth


Dial calipers measure3

Dial Calipers Measure

  • Thickness or Outside Diameter

  • Inside Diameter or Space Width

  • Depth

  • Step Distance


Discussion questions

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

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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