1. Graphic Communication
British Standards
Graphic Communication
Department of
Technological
Education

2. Knowledge & Understanding
British Standards - Drawing Conventions
Line Types
Dimensioning
Why?
We have a greater understanding of why we are doing things in a certain way.
We have an broader understanding of the implications it has on industry.

3. What does British standards mean to you?
The British Standards Institution (BSI) is the UK's national standards body.
It brings together representatives from a range of organisations to develop formal Standards for the benefit of UK business and consumers.

4. British Standards
Standards make our lives easier, safer and healthier. Without them, everyday actions we take for granted would be unpredictable.
Standards help to make many of the products we use safer and more reliable.
Once you are familiar with the idea of products meeting Standards, it will help you to understand how Standards are met in order to keep us safe and sound.

5. British Standards
In Short they are set methods/procedures that allow us to consistently reproduce quality products.
With regards to Drawings BS allows standardisation ie. It creates a common language between professional people.

6. British Standards –Drawing
BS EN ISO : Technical drawings. General principles of presentation. Basic conventions for lines.
BS EN ISO : Technical drawings. General principles of presentation. Preparation of lines by CAD systems.
BS EN ISO : Technical drawings. Projection methods. Orthographic representations.
BS :1995 -Technical drawings. Dimensioning and tolerancing.
BS ISO :2001 -Technical drawings. General principles of presentation. Basic conventions for cuts and sections.

7. Line Types Visible Outlines and Edges.
Construction, projection and dimension projection.
A continuous thick line.
A continuous thin line.
These are the two basic line thicknesses recommended
in the BS. However you will see there are variations in
Their use.

8. Line Types Hidden outlines and edges. Centre Lines.
A broken thin line. Dashed lines should start on a line & finish on a line. Dashes and spaces should be of even length and spacing.
Thin line.
Long dash – short dash. Centre lines should extend slightly passed the feature it applies to.
They should not stop at another line.
Where centres points are defined – long dashes should cross.
Centre Lines.

9. Line Types Section lines (cutting planes) Fold lines
Like the centre line but ends and change of direction are thick
Thin line.
Chain of long dash and two short dashes.
Fold lines

10. Question?

11. Solution!

12. Question?

13. Solution!
Section Line
Fold Line
Centre line

14. Dimensioning
When applying measurements there are some simple rules to follow!
Projection lines should be
thin and disconnected from
the part. 1
Arrow heads should be narrow
Filled 2
Sizes should be written
Clearly ABOVE the line 3

15. Parallel Dimensioning
Two methods we should know for now!
Linear Dimensioning
Parallel Dimensioning

16. Dimensioning For A radius… The dimension line should pass
through the centre point of the
arc.
The dimension line should
have one arrowhead that
touches the arc.
The symbol R is placed in front
of the dimension.
R10
R10

17. Dimensioning For a Diameter… The dimension line should pass
Ǿ 10
The dimension line should pass
through the centre point of the
arc.
The dimension line should
have two arrowheads that
Touch the arc.
The symbol Ǿ is placed in front
of the dimension.

18. Dimensioning For Angles… Curved double headed arrow 30° between lines.
The angle is written outside the
Arrow.
Alternatively Arrows can be
Outside with the angle written
Lines.
30°

19. Hatching for Sections Angle used is 45° Spacing equal 4mm
For Exploded views direction of hatching is the same.
For assembled views
Part 1 in one direction
Part 2 in the opposite direction with same spacing.
Part 3 spacing reduced to half.

20. Hatching for Sections
Exploded
Assembled

21. Hatching for Sections We do not Hatch… Nuts, Bolts, washers.
Keys, Webs, Shaft.
Spindles, Gears, Pins.
Note – Shafts are only sectioned if cut through the cross sectional area.

22. Go for it!
BSI-Education.org/BritishStandards