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

More accurate than dial calipers 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 Supported by Surface Plates and Machine Tables 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.

7. .217

8. .272