British Standards
All our drawings must meet the requirements of the British Standards institution. They have guidelines regarding the presentation of Technical Drawings. A basic summary of lines is as follows
| Line Type |
Used for |
Description |
| 1.Continuous thick |
The finished projected view. |
Should be heavy, thick and continuous |
| 2.Continuous Thin |
Should be used for Construction lines and Hatching |
Should be light, thin and continuous |
| 3.Dashed |
Used for Hidden detail |
Should be slightly thinner but still as heavy as Continuous thick lines |
| 4.Chain thick |
Used for Sectional views |
Should be thick, heavy and finish in thick arrows pointing up. |
| 5.Chain thin |
Used for Centre lines of circles and curved surfaces |
Should be thin and light. |
If you come across a scenario where a line overlaps another there is a system that decided which line has priority. It is as follows:
1. Continuous Thick.
2. Dashed.
3. Chain thick.
4. Chain thin.
5. Continuous thin.
There are many other issues dealt with in the BS888, some of which we have come across already, however many of these issues you will not need to know about in your Junior Cycle course.
|
