1. Graphic Communication
Notre Dame High School
Graphic Communication
Dimensioning
Technical Department

2. 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.
Technical Department

3. 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.
Technical Department

4. Dimensioning
Horizontal dimensions are read from the bottom of the page. 50
Technical Department

5. Dimensioning
Vertical dimensions are read from the right-hand side of the page. 40
Technical Department

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
Technical Department

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
Technical Department

8. 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
Technical Department

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. Dimensioning
When dimensions are taken from one leader line then this would be called a datum line 30 10
Technical Department

11. Dimensioning The symbol Ø stands for diameter. Ø45
Circles should always be dimensioned to show their diameter.
Technical Department

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

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.
Technical Department