Fundamentals of Engineering Scales and Scaling

Goals Understand units and measures Understand concepts of scaling and types of scales Scales and Scaling

3 Units of Measure Measurement of Length and Angle are used in Engineering Length English - Inches, unless otherwise stated  Up to 72 inches – feet and inches over SI Units – millimeter, mm Angle (angular measurements) English - Degrees, minutes, seconds (60° 30’ 20”) SI Units - Degrees in decimal (60.53°)

4 Terms and Definitions - Scaling Scaling a drawing is a process for making an object fit the dimensions of the display media (e.g. paper) Scales are tools used to scale a drawing while creating it – a conversion factor is built in

5 Three Common Types (Labels) for Scales Length Measurements in English Units

6 Open-divided Full-divided Types of Scales by Presentation

7 Types of Scales (Tools) by Construction Up to 12 scales On a triangular scale

8 Architect’s Scale – Major Unit = 1 foot Subunit = inches Mech. Eng. Scale – Major Unit = 1 inch Subunit = fraction of an inch Civil Eng. Scale – Major Unit = 10’s of feet Subunit = tenths of major unit

Use a Scale to Measure, But Not To Draw Lines

10 Mechanical Engineer’s Scale

11 Practice Problems Scale: 1 ½ inches = 1 foot Answer: 1' 9" What is the dimension shown?

12 Practice Problem Scale: 1 in = 200 feet What is the dimension shown? Answer: 450 feet

13 Compound Scale Decimal Inches Full Scale Millimeters Full Scale Fractional Inches Full Scale Fractional Inches Half Scale

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