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# Precision Measuring PowerPoint PPT Presentation

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

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

• 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

Tools for Precision Measuring

Steel Rule

Micrometer

Tools for Precision Measuring

Digital Caliper

Dial Caliper

The dial caliper is

a precision measuring

instrument.

in inches and tenths (.1) of an inch.

inch

{

Each inch is broken into ten, for .1 of an inch.

in thousandths (.001) of an inch.

The reference edge keeps track of larger increments; the dial is for smaller increments.

One full revolution of the pointer

on the dial equals

one hundred thousandths (.100).

Dial Caliper Parts

Inside Measuring Faces

Dial

Clamp Screw

Outside Measuring Faces

1 in. – 6 in.

Step 1

2

Step 2

Read tenths of an inch from

3

2

.0 in. -.9 in.

1 in. – 6 in.

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

• 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