Lesson video

Hello, my name's Mrs. Taylor and I'm really pleased you can be here today to join me for our lesson.

Our lesson today is Draw Orthographic Projections and this is part of the Communication unit.

The outcome, I can draw a simple orthographic projection.

We have three keywords, orthographic, which represents a 3D object in 2D, where views are projected from the object's surface.

Construction lines, used to plan out and position elements of a drawing.

Isometric, a 3D representation of an object where sides are drawn at 30 degrees.

In today's lesson, we have two parts.

The first, the key features of an orthographic projection and the second to draw an orthographic projection.

Let's begin.

Features of an orthographic projection: multiple views, the front, side, or plan, which you could describe as the top.

Scale and proportion, they are drawn to a consistent scale, ensuring accurate size and shape.

Drawing conventions, three views, centre line, hidden lines, dimension lines and alignment.

No perspective, a flat 2D drawing of a 3D shape.

Annotation and labels, material notes and manufacturing intentions.

And construction lines, used to make sure all three views are aligned and the same size.

There is lots of information on this page.

Can you discuss with the person next to you which of these features are familiar to you and which are unfamiliar? Here we have a check for understanding.

Which of the following is not a feature of an orthographic projection? Is it A, multiple views front, plan, and side, B, dimensions, or C, a 3D view? Pause the video and have a go.

Wonderful, let's check.

That's right, a 3D view is not a feature of an orthographic projection.

Well done.

An orthographic projection draws each of the views in 2D and they appear flat, so 3D objects would appear three dimensional and more lifelike.

Below is a building block.

We see multiple sides because we see in three dimensions.

To draw in orthographic, we need to identify each of the three dimension views.

When you look at the shape from the side, plan or the front, there is no depth, it looks completely flat.

For example.

And now we have another check for understanding.

True or false? An orthographic projection must include perspective.

Pause the video and have a go.

Great.

Let's check.

That's right, it's false.

Orthographic projections are completely flat and show no depth at all.

Orthographic projections are 2D and flat, but perspective is an example of a three dimensional drawing, which gives us the information about height, width, and depth.

Task A.

Create a simple shape using basic building blocks.

Sketch out the front, plan and side views.

Don't worry about the size or position of the drawings.

Label your drawings with the front, side and plan view.

And repeat this for two more shapes.

Pause the video and have a go.

Well done, let's have a look at some of the answers you may have come up with.

Your answer may look something similar to this.

With the plan, the front, and the side view, well done.

We now move on to the second part of our lesson.

Draw an orthographic projection.

Setting up your page to draw an orthographic projection.

The most informative and clear side can be selected as the front view.

All orthographic projections follow the same layout.

The front view is drawn first.

The distance between the views should be equal.

On this example, we can see the front view, which is on the bottom left, with the plan view directly above it and the side view directly by its side.

Using an isometric drawing as a starting point, draw an orthographic projection.

We are now going to look at each of the steps required to draw an orthographic projection.

Let's go.

Part one, label the front, side and plan view on the isometric projection.

Step two, draw the front view in the bottom left hand corner of the page.

Let's have a quick check for understanding.

When creating an orthographic projection, which view do you draw first? Is it A, the side view, B, the plan view, or C, the front view.

Pause the video and have a go.

Wonderful.

Let's check.

That's right, it's the front view.

Well done.

Remember, the front view always goes on the bottom left of your page to start with.

Draw an orthographic projection continued.

Part three, draw construction lines from the front view to help draw the plan and side views.

In this example, we can see them represented with pink lines going above and beside the front view.

And part four, mark hidden lines using a dotted line.

Let's have a quick check.

What are construction lines used for in an orthographic projection? Is it A, they make sure each view is aligned and the same size, B, to help you draw straight lines, or C to divide the page into equal sections.

Pause the video and have a go.

Wonderful.

Let's check.

That's right, it's A, they make sure each view is aligned and the same size.

Well done.

We now have task B and there are two parts.

The first part, draw an orthographic projection of a cube.

Here you can see an isometric view and then the layout of the page with the front, the plan and the side views.

Your checklist includes all the sides are the same size, that construction lines are used to show alignment and the views are labelled.

Pause the video and have a go.

Fantastic, let's have a look at some of the answers you may have come up with.

Here we can see an example with the front, the plan and the side view.

All drawn the same size with construction lines to show alignment and labels.

Well done.

Part two is to draw an orthographic projection for the shapes below.

And here is your checklist.

Start with the front view in the bottom left of your page.

Draw construction lines vertically from the front view to the plan and side views.

And ensure all drawings are the same size.

Pause the video and have a go.

Wonderful, let's have a look at some of the answers you may have come up with.

Here are some examples.

Start with the front view in the bottom left of your page, draw construction lines vertically from the front view to the plan and then to the side and ensure all drawings are the same size.

Well done.

Here we have a summary of our learning today.

Orthographic projection represents a three dimensional object using multiple two dimensional views, including the front, the plan, and the side.

The drawing process begins with the front view positioned in the bottom left, followed by construction lines to align the plan and side views to ensure accuracy.

Hidden lines or details should be represented with dotted lines.

And all views must be the same size, which can be checked with a ruler.

Well done and thank you for joining me today.