MEASUREMENT

MEASURING TOOLS• RULER• DIAL CALIPER• VERNIER CALIPER• OUTSIDE MICROMETER• DEPTH MICROMETER• INSIDE MICROMETER• INDIRECT MEASUREMENT• HEIGHT GUAGE• INIDICATORS

Systems of Measurement

• US Conventional System- inches, feet, yards• Fractional Notation• Decimal Notation• Reading a Ruler (review page 70 Modern Metalworking)

• International System of Units (SI)- SI metric • Millimeters/ Half millimeters• Reading a Ruler (review page 71 Modern Metalworking)

Ruler

• Graduations

• Fractional Inch (1/8”-1/64”)

• Decimal Inch (10th, 20th, 50th)

• Metric (millimeters and half millimeters)

Combination Square

Rulers

Dial Calipers

Bezal Lock, Caliper Dial, Clamp Screw, Fixed Jaw, Scale Beam, Movable Jaw, Inside Nib.

The Dial Caliper

How to Read a Caliper

Vernier Calipers

• More accurate than dial calipers

Vernier Measurement Review

Outside Micrometer

Reading a Micrometer

Depth Measurement

• Used to accurately measure the depth of a hole or bore.

Depth Measurement

Inside Micrometer

• Used to accurately measure bores or hole diameter

Inside Micrometer

Indirect Measurement

Height Gage • Types

• Digital, Dial, or Vernier

• Supported by Surface Plates and Machine Tables

Indicators• Used for “quick checking” parts and machine setups• Types

• Balanced- can be read in both directions from the “0” line

• Continuous- read clockwise from “0” line• Digital

Using an Indicator

Test Your Knowledge

• What is the graduation of this ruler?• When is a magnifying glass needed? • Why should you begin readings at the 1”? • Identify the highlighted marks.

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