1. Extracting Information

2. Sources of information
Before starting any Assembly activity you will need to collect all sources of relevant
information. These could be:
Relevant up to date drawings
Manuals/procedures/tables/charts
Technical specifications
Component settings

3. Drawings (BS )
Often contained in the workshop manuals, Manufacturers web sites and the Drawing
Office
There are many different types of drawings available all with their own particular
Importance
In order to maintain consistency in engineering, a system of standardisation has been
Adopted –
The British standards institute (BSI)
International Organisation for standardisation (ISO)
Often contained in the workshop manuals, Manufacturers web site and the Drawing Office

4. Component drawings
These are working diagrams of individual components and are usually orthographic drawings in either first or third angle projection
Pictorial drawings are also used and can be either Isometric or Oblique.
Component drawings may include - sizes tolerances, material type, weight and part number

5. Orthographic
In simple terms, orthographic drawings are views (front, side, top, and so on) of an object. An orthographic view is only one side. It takes several views to show all the object. They are used for individual components included on the drawing will be:
Dimensions- lengths, widths , heights, thread types, Hole sizes etc
Tolerances
Material Type
View
Drawing number
Title/part number
Views
Plan or top
Front
End / side
Auxiliary - a view taken from an angle that is not one of the primary views

6. Views
There are two ways of drawing in orthographic - First Angle and Third Angle.
First angle projection is the ISO standard and is primarily used in Europe. The 3D object is projected into 2D "paper" space as if you were looking at an X-ray of the object: the top view is under the front view, the right view is at the left of the front view.
Third angle projection is primarily used in the United States and Canada, where it is the default projection system according to BS 8888:2006, the left view is placed on the left and the top view on the top.

9. Pictorial drawings
Pictorial drawings show several sides at the same time.  Many people find pictorial
drawings easier to understand. 
They do not provide as much information as orthographic views.
Pictorial drawings are also used and can be either Isometric or Oblique.
Component drawings may include - sizes tolerances, material type, weight and part
number

11. Section Drawings
Many objects have complicated interior details which cannot be clearly shown by means of front, top, side, or pictorial views.
Section views enable the engineer to show the interior detail in such cases.
Features of section drawings are cutting-plane symbols, which show where imaginary cutting planes are passed to produce the sections, and section-lining (sometimes called cross-hatching), which appears in the section view on all portions that have been in contact with the cutting plane.

12. Assembly and Sub Assembly drawings
The assembly /sub-assembly drawings are drawings showing in some detail how the
component items fit together. 
Exploded view is a representative picture or diagram that shows the components of an object slightly separated by distance
Exploded diagrams are common in descriptive manuals showing parts placement, or parts contained in an assembly or sub-assembly. Usually such diagrams have the part identification number and a label indicating which part fills the particular position in the diagram.

13. Layout Drawings
A set of working drawings which usually includes detail drawings of all parts and
assembly drawing of the complete unit

14. Other Sources of Information

15. Procedures Are a sequence of tasks, steps, decisions, calculations and
processes, that when
undertaken in the
sequence laid down
produces the described
result, Workshop
manuals may include
Procedures for Assembly,
Strip down Installation etc

16. Technical Specifications
the term specification is used in connection with a data sheet (or spec sheet). A data sheet is usually used for technical communication to describe technical characteristics (weights, dimensions, power etc) of an item or product. It can be published by a manufacturer to help people choose products or to help use the products.

17. Component Settings