Technical drawing: views and scale

Three views (orthographic), oblique and isometric drawing, perspective and scale. Read one part at a time and tap “I know this”. Then test yourself in the quiz.

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Three views

Each view shows only two of the three measurements.

We draw three views because one flat drawing cannot show the whole object. The lines with arrows that show a measurement are dimension lines. Use a pencil, because mistakes can be rubbed out.

Tap when you could tell someone without looking.

Three ways to draw 3D

Oblique: front flat. Isometric: a corner at the front. Perspective: lines run to a vanishing point.

In one-point perspective all lines going away from you meet at one vanishing point on the horizon line. Objects look smaller the further away they are.
A box above the horizon line: you see its underside.
Use a 45° set square or protractor for 45°, and a 30°/60° set square for isometric.
Construction lines: light and thin. Rendering: adding shading and colour.

Rule

Real size = drawing ÷ the first number × the second number of the scale. Example: 1 : 5 and 14 mm → 14 × 5 = 70 mm. At 2 : 1, a 40 mm drawing is 40 ÷ 2 = 20 mm in real life.

Tap when you could tell someone without looking.

Remember this and test yourself

Remember this: your summary

Orthographic projection: front, side and top views show the whole object on flat paper.
Front view = height and width; top view = width and depth.
Oblique: front face in true shape, depth at 45°. Isometric: upright edges stay upright, the others at 30°.
Scale 1 : 2 = half size; 2 : 1 = twice the size; 1 : 1 = true size.
A dashed line shows a hidden edge; a working drawing always has dimensions and a scale.

Write these points in your book. Read them again the night before the test.

Memory trick

Oblique = 45, iso = 30: the “oblique” one slants more.

Flash cards · Tap to turn over

Important words

First say what the word means, then turn the card over.

Test yourself · Part 2

True or false?

Read the question and the answer. Is the answer right? Tap True or False.

Now the real quiz!

The quiz has many more questions on this topic. Every question shows straight away whether you are right and explains why.

Take the quiz: Technical drawing: views and scale

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For parents

Read one part together and ask your child to tell it back in their own words.
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Follows CAPS for Grade 7 Technology (Technology). Always check your teacher’s notes and textbook too.