1. Graphic Communication
Dimensioning
17/02/03
Designed by Barry Forbes

2. Designed by Barry Forbes
Dimensioning
We dimension objects to show what size they are.
This is vital when we pass our drawings onto a craftsperson to make the object.
17/02/03
Designed by Barry Forbes

3. Designed by Barry Forbes
Dimensioning
Dimensions are drawn to British Standards.
This means that all dimensions are always drawn the same way.
Dimensions you show will always be measured in millimetres so you do not have to show units.
17/02/03
Designed by Barry Forbes

4. Designed by Barry Forbes
Dimensioning
Horizontal dimensions are read from the bottom of the page. 50
17/02/03
Designed by Barry Forbes

5. Designed by Barry Forbes
Dimensioning
Vertical dimensions are read from the right-hand side of the page. 40
17/02/03
Designed by Barry Forbes

6. Dimensioning 40
Vertical dimensions are read from the right-hand side of the page.dimension figures should never touch the outline of the object. 40

7. Dimensioning
Leader lines are used to bring the dimension away from the drawing.
There should always be a gap left between the object and the leader line. 40

8. Designed by Barry Forbes
Dimensioning
The arrowheads used on the dimension line should be kept small and slim and the point of the arrowheads should touch the leader lines. 50
17/02/03
Designed by Barry Forbes

9. Dimensioning
Larger dimensions should be drawn further away from the object.
100 25 25 25 25
Smaller dimensions like these should be placed in line.

10. 17/02/03
Dimensioning
When dimensions are taken from one leader line then this would be called a datum line 30 10
Designed by Barry Forbes

11. Designed by Barry Forbes
Dimensioning
The symbol Ø stands for diameter.
Ø45
Circles should always be dimensioned to show their diameter.
17/02/03
Designed by Barry Forbes

12. Dimensioning The symbol R stands for radius. R20
Curves should always be dimensioned to show their radius.

13. Dimensioning - Rules Show a dimension only once.
Dimensions should only ever be read from bottom or the right-hand side of the page.
All sizes are shown in millimetres.
Your dimensioning figures should never touch or interfere with any part of the drawing.
Ø is the symbol used to show a diameter, while R is used to show a radius.
Show the diameter of circles.
Show the radius of curves.