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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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Presentation Transcript
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

slide3
Tools for Precision Measuring

Steel Rule

Micrometer

slide4
Tools for Precision Measuring

Digital Caliper

Dial Caliper

slide5
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.

slide6
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.

slide7
One full revolution of the pointer

on the dial equals

one hundred thousandths (.100).

slide8
Dial Caliper Parts

Inside Measuring Faces

Dial

Clamp Screw

Blade

Fine Adjustment Screw

Dial Adjustment Screw

Outside Measuring Faces

slide9
Reading a Dial Caliper

1 in. – 6 in.

Step 1

Read inches from the blade

2

slide10
Reading a Dial Caliper

Step 2

Read tenths of an inch from

the blade

3

2

.0 in. -.9 in.

1 in. – 6 in.

slide11
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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