A huge part of our major is measuring. We draw what needs to be built - so it has to be drawn correctly.
Performance Standard 1.2 : Utilize Mathematical Operations and Measuring Techniques Performance Indicators : 1.2.1-1.2.5
Students need to understand the fractions involved in US Imperial measuring. These WILL NOT be covered in class. So if a student is rusty on them, practice needs to happen at home.
Remind yourself how to use a ruler
HERE IS A FUN RULER GAME for you to practice - it is speed based so have fun !!!!
https://www.rulergame.net/new-english-ruler-game.php
Reading A Tape Measure
To put a drawing on a piece of paper we either scale it up or down. This is my simple grassroots explanation - it is that basic. To understand the details let’s go to the website Sciencing.com : https://sciencing.com/list-7612075-scales-used-technical-drawings.html
Full scale drawings show the actual size of an object. If the object is either too small or too large to draw full scale, the designer scales it up or down. If you are building parts - you talk about 1 to 2 or half scale. Here you can see that the rectangle when drawn in 1/2 scale is 1:2. When the rectangle is drawn in full scale it is 1:1. When the rectangle is drawn in 2x scale it is 2:1. This matters tremendously if you are an engineer. Technical drawings are drawn to scale so that engineers, architects and builders can create the objects in the drawing to exact specifications. When reading scales, the number on the left equals the measurement on the drawing; the number on the right is the actual size.
Civil Engineer's Scale - will use with civil and landscape
Civil engineer scales are used to design large projects such as roads, bridges and water mains. Depending on the project, 1 inch on the scale can represent 100 feet in real life. The civil engineer's scale divides 1 inch into equal decimal units of 10, 20, 30, 40, 50, 60 and 80. Plans drawn in 10 scale may show scales such as 1 inch = 10 feet, 1 inch = 100 feet. The 20 scale is used for scales such as 1 inch = 2 feet, 1 inch = 20 feet and 1 inch = 200 feet. Whether you are using a 10 scale, 20 scale or 50 scale, the values increase by multiples of 10. So, for example, a 50 scale drawing could use a scale of 1 inch = 5 feet, 1 inch = 50 feet, 1 inch = 500 feet.
Architect's Scale - our main tool
Architect scales convert inches into feet and always read X inches = 1 foot 0 inches. The scale 1/4 inch = 1 foot 0 inches means that 1/4 inch in the drawing equals 1 foot in the actual building--or is drawn 1/48 size. In other words, the size of the drawing is 1/48th the size of the actual building or project. The architect's scale is used to draft plans of large and smaller scale projects. These include buildings and structures, as well as interior and exterior dimensions of rooms, walls, doors and windows.:3101:36
Metric Scale - important to mechanical engineering
The metric scale uses the millimeter as its base measurement. Full size on the metric scale is shown as 1:1. Half scale is 1:2. It is helpful to think of this as one unit on the drawing equals two units on the object. A small object can be enlarged on the paper and drawn in 2:1 scale. This means the drawing of the object is twice as large as the object itself. Designers use an enlarged scale, such as double scale, on objects that are too small to draw full size with any meaningful detail. Common metric scales are 1:100, 1:50, 1:20, 1:10 and 1:5. For example, 1:50 scale equals one-fiftieth (1/50) full size--or 1 millimeter on the drawing equals 50 millimeters in reality.
SO LET’S DIG IN AND FIGURE THIS OUT.
To put a drawing on a piece of paper we either scale it up or down. This is my simple grassroots explanation AGAIN - it is that basic. AND THAT COMPLICATED. If you scale correctly, your drawings convey the information better. This link shows how that model scaling affects model builder.
To put a drawing on a piece of paper we either scale it up or down. This is my simple grassroots explanation AGAIN - it is that basic AND THAT COMPLICATED. If you scale correctly, your drawings convey the information better. This link shows how that model scaling affects model builder and gives you a better understanding of the complexity. The website is www.OakridgeShops.com
https://oakridgestores.com/models/modeling-in-scale-conversion-charts-sizes-faqs/
Scale factor is HOW MANY of the scale fit into 1 foot. That is it. We will learn more about this in the future - but think about it this way: If we are measuring something in ¼”=1’, then every ¼” we measure is actually 1’ (12”) long. So if we divide 12” by ¼” we get a factor of 48. It does not have a unit because it is a factor. So if you have a plate that is 4’ x 20’ - it won’t fit on a 8-½” x 11” paper, but if I draw it in ¼”=1’ scale it is only drawn as 1” x 5”. Now it easily fits on a piece of paper so we can talk about it. Scaling will eventually go away - but not for you!!! So LEARN IT.
These videos will help and the following photos walk you through the details on your way to learning to scale! Good Luck