BS8888 is the recommended procedure for improving communication and standardisation in relation to technical draughting. This course concentrates on the key principles required to read and interpret engineering drawings. Links are also made between BS8888 and related ISO and other standards. Practical exercises run throughout the course, and help to make this a lively and enjoyable programme.
General Principles of Presentation
Basic Convention for Lines
- Correct engineering drawing requires the use of different line types & styles to represent different elements of the finished product, & to avoid confusion in interpretation.
- Producing lines via CAD systems
- The importance of lettering & when to use different text styles
- How to use the BS8888 standard for preferred scale factors when converting full-size CAD drawings to scale factor plots
- Understanding the choice between first & third angle projection
- Some 3D modelling systems have the ability to show screw threads in a graphical form, however 2D drawings do not require this level of detail
- Examines how to represent both internal & external screw threads
- When to add tolerances ?
- Explanation of why they are needed
- Shows how the designer can check that tolerances are correct
- When machining components the surface finish will be important to the end user, & this section examines how to state & interpret different types of surface finish