Assembly Drawings, Study notes of Engineering

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Engineering Drawings:

Assembly Drawings

A short lecture on Assembly Drawings as per the Australian Standard AS By Paul Briozzo

Engineering Drawings

A short series of lectures on Engineering Drawing as Part of ENGG By Paul Briozzo

Detail Drawing

Detail Drawing

Sub-Assembly Or Working Assembly

Assembly Drawing - General

Specifications Specifications

Detail Drawing

Detail Drawing

Specifications Specifications

Specifications Specifications

Specifications

A Family Tree showing how Assembly Drawings, Sub or Working

Assembly Drawings, Detail Drawings, Standard Components and

Specifications are interrelated

Standard components

Sub-Assembly Or Working Assembly

Assembly Drawings must provide sufficient

information to enable the assembly of a

component.

• Assembly Drawings must have a number of views to show how parts

fit together.

• Section views to show how parts fit and to eliminate hidden detail.
• Dimensions to indicate range of motion or overall size of assembly for

reference purposes.

• Individual components identified with balloons and leader lines.
• Parts list (or BOM – Bill of Materials) relates to balloon numbers on

drawing.

• Revision table
• May require multiple views on separate page for very large assemblies

Dimensions

In the Assembly Drawing above notice how dimensions are used to give an overall representation of size. Dimensions are not included on individual detail components or standard hardware.

Parts List or BOM (Bill of Materials)

In the assembly drawing above notice the arrangement of the numbering of the individual sub assemblies, components and standard hardware. They are numbered from the bottom of the parts list upwards. The relevant quantities and materials (missing) should also be stated.

Detail Drawings from Sub Assembly

Note the that the Used On is a Sub Assembly not the Main Assembly

Sectional views within an Assembly Drawing allow for clarity in hidden locations where parts are located.

Sectional Views on Assembly Drawings

Working or Detailed Assembly

Working or Detailed Assembly Drawings are a combined detail and

general assembly drawing which fulfils the function of both types.

Some Features of Working Assembly or

Detailed Assembly Drawings

• Only simple assemblies are drawn in this manner.
• Information is cluttered.
• Not recommended as the tasks of manufacture and assembly are very

different and may be split across vendors.

• Only use when you have no option e.g. one part to be manufactured

requires the co existence of another.

• Do not use in any assignments for ENGG1960.