Intro to Technical Drawing

8/13/2019 Intro to Technical Drawing

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Technical Drawings

What is Technical Drawing?

Technical drawing is the study of the procedures, tools,

supplies, skills and techniques used to record and

communicate the shape and size of a product.


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Technical Drawing Turn Ideas into Products

Every product we have today (cars, houses, beds, tables,

chairs, desks, appliances, tools, packages, clothing, toys,dishes, radios, CD players, video games, roads, bridges,

airplanes, ships, buses, computers, telephones, fax

machines, copiers, air-conditioners, heaters, light bulbs,

keys, etc.) began as an "idea" in some person's head. Beforethese "ideas" became products, they had to be drawn on

paper.


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What Do Technical Drawings Show?

These "drawings" must show what the "idea" looks like from

different directions

top, front and right side views

how long, wide and high the object is

what materials were needed to make the object


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Pictorial DrawingA simple box has 6 sides - top, bottom, 2 ends and 2 sides. An

Isometric Drawingof a box looks like this

An Isometric Drawingis 3 dimensional. It shows the

length, height and width of the object.


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Orthographic Views or DrawingsOrthographic Projection is a projection on a plane, using lines

perpendicular to the plane. Orthographic drawings are views

(front, side, top, and so on) of an object. An orthographic view isonly one side. Its 2 dimensional, showing just length and width of

that side.


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Orthographic View

One important thing to note is that the labels are for the position.

Front view is always in this location, regardless of the object that

is drawn. Front View is actually of the side of the truck, Right SideView is of the front of the truck.


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Lets Investigate Further!

How does isometric drawings relate to orthographic views?


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How Isometric Drawings Relate toOrthographic Views?

1. Start with Isometric box.


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How Isometric Drawings Relate to Orthographic Views?

2. Think of it as a real box. Imagine cutting the box along the

corners so that it lays flat. If you make a particular set of cuts, the

box will unfold to look like this.


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3. As you can see, the six sides unfold in a pattern. Three sides are

normally used to make orthographic projections - Front View, Top

View and Right Side View. The next drawing has the rear, left side

and bottom views removed.


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4. So far, we have taken an imaginary box, cut it along several

edges, folded it flat, and cut off 3 of the sides. What we are left with

is 3 sides of the box. The next step is to separate the remaining sides.

Note that the Front View, Top View and Right Side View are still in

the same relative position to each other. Also we are now looking

straight at each surface. In the pictorial drawing, we were looking at

a 3 dimensional object, and all the surfaces were tilted away. (Look

back at #1)


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5. Finally, we cut the three remaining sides apart and separate them.


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6. These views are now starting to look like orthographic views or

projections. They are located in particular positions. They are

always located in these positions. Floor plans for a house are really a

special type of Top View.


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7. Notice that the views are in the same relative position as they are

in the isometric drawing below. (Remember Isometric Drawings are

3-Dimensional drawings)


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Assignment

You will be given a handout, similar to the one below. Cut along the

solid, black lines and fold on the dotted, black lines. Tape the edges

to create a 3-D object.

Intro to Technical Drawing

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