1. Task 3

2. Describe the relevant sources and methods for obtaining any required technical information relevant to the model being produced (such as drawing briefs, specification sheets, request for changes or modifications to models; technical information such as limits and fits, contraction allowances, bearing selection, surface finish).

3. Drawing briefs
Instructions stating which part(s) of an assembly should be drawn as engineering drawings.
It will state the following:
size of the drawings required
1st or 3rd angle orthographic projection
how many copies required
file format required

4. Specification sheets These sheets are documents such as:
British Standards
Company standards
Customer requirements
They may contain information such as:
Manufacturing processes
Materials to be used

5. Request for changes or modifications to models
These are documents that instigate a change being made to a model or drawing.
This document also acts as a change notification to inform all personnel, from estimating and sales through to manufacturing, that a change has been made.

6. Technical information such as limits and fits, contraction allowances, bearing selection, surface finish
This information is located in documents or books such as:
British Standards
Zeus Books
Engineers Handbooks
It tells you nationally and internationally recognised standards to work to, rather than creating your own.
It saves time by giving you information in tables, rather than you needing to calculate it yourself.

7. Questions?

8. Technical information may be obtained from sources such as:
Drawing brief…. manufacturing info/material/finish/dimensions
Specification sheets.… manufacturer/designer
Change or modification requests…. List changes required to specification or an engineering drawing.
Technical information including:
Limits and fits…. Zeus books, internet, Mechanical Engineers reference books
Contraction allowances…. Mechanical Engineers reference books, internet
Bearing selection…. manufacturers or supplier catalogues
Surface finish…. samples, measured by machines