Lecture 1 Scales and Ratios

# Lecture 1 Scales and Ratios - Standard Drawing Scales and...

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1 Standard Drawing Scales and Ratios CGN 2328 Technical Drawing and Visualization

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2 Standard Scales Used to measure distances on any scaled drawing Triangular scales are common because they offer the user a combination of several scales In this class and most likely in your job, you will use the Engineering Scale and the Architectural Scale
Triangles CGN2328 - Dr. Najafi - Lecture CGN 2328 Lecture 2 - Dr. Najafi 3 Triangles can be used to find a combination of many angles. The following combinations of 30°-60°-90° triangle and the 45°-45°-90° triangle provide measurements in 15° increments.

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4 Engineering Scale Each inch is divided into decimal increments Labels 10, 20, 30, 40, 50, 60 on the edges indicate the scale being used Always written as 1”=X’ or 1”=X” The 10 Scale is your True Length Scale 1 inch is divided into 10 divisions. On the 30 Scale, 1true inch is divided into 30 equal divisions
5 Engineering Scale Notation: 1” = X units , where X can be expressed in inches, feet, or miles.

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6 Engineering Scale Example Using scale of 1”=3’, find 3.5ft 3.5ft
7 Engineering Scale Example Using scale of 1”=50’, find 115’ 115’

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## This note was uploaded on 08/04/2011 for the course CGN 2328 taught by Professor Najafi during the Summer '08 term at University of Florida.

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Lecture 1 Scales and Ratios - Standard Drawing Scales and...

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