How To Read Scale In Drawing

Located in the lower right of the drawing the title block contains the architect or designer s name the drawing number project name part number or building address and the scale of the drawing. When learning how to read construction plans it is essential to understand what is contained within typical construction plans. To understand what a scale bar is and how it aides drawing and map representation we must firstly understand what scale itself is.

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The 20 scale is used for scales such as 1 inch 2 feet 1 inch 20 feet and 1 inch 200 feet.

How to read scale in drawing. An architectural drawing lists the scale as 1 4 1. It is crucial that you read everything and understand it before you estimate or start the construction project. If a bedroom measures 212 by 334 on the drawing how large is the bedroom.

Covered in detail here. Scale drawings allow us to accurately represent sites spaces buildings and details to a smaller or more practical size than the original. Ratio and scale numbers explained and use shown.

The difference between the ratio numbers represents the factor by which the scaled image is enlarged or reduced. This will help you understand what you re looking at. A scale drawing of a school bus has a scale of 1 inch to 5 feet.

Scale drawings show an image either reduced or enlarged in size. Most include a cover page time block key notes general notes revision block drawing scale and a legend. Scale is the method of representing a subject at a different proportion to its real world size although most commonly used as a device to reduce proportions it can also be used to increase them.

So for example a 50 scale drawing could use a scale of 1 inch 5 feet 1 inch 50 feet 1 inch 500 feet. Start by looking at the title block on each drawing. Scale drawings before studying this lesson about scale drawings you should review the lesson about solving proportions since it is not always possible to draw on paper the actual size of real life objects such as the real size of a car or an airplane we need scale drawings to represent the size like the one you see below of a van.

Whether you are using a 10 scale 20 scale or 50 scale the values increase by multiples of 10. The change between the original and the scaled drawing is generally represented by two numbers separated by a colon like 10 1 read as ten to one. When a drawing is described as to scale it means that each element in that drawing is in the same proportion related to the real or proposed thing it is smaller or indeed larger by a particular percentage.

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