Engineering drawingsEngineering drawings

What are Engineering What are Engineering drawings?drawings?

• An An engineering drawingengineering drawing is a type is a type of technical drawingof technical drawing

Types of technical drawingsTypes of technical drawings

• Engineering drawingEngineering drawing

• Cut away drawingCut away drawing

• Exploded view drawingExploded view drawing

• Patent drawingPatent drawing

• Technical illustrationsTechnical illustrations

• Technical sketchesTechnical sketches

• Working drawings eg plumbing and Working drawings eg plumbing and electrical drawings.electrical drawings.

Cut away drawingCut away drawing

Exploded view drawingExploded view drawing

Patent drawingPatent drawing

Technical IllustrationTechnical Illustration

Technical sketchesTechnical sketches

A typical Engineering A typical Engineering drawingdrawing

What is the purpose of an What is the purpose of an Engineering drawing?Engineering drawing?

• Discuss in groupsDiscuss in groups

• Engineering drawings provide Engineering drawings provide information for an operator to make an information for an operator to make an itemitem

• They are created within the technical They are created within the technical drawing discipline drawing discipline

• They are used to fully and clearly define They are used to fully and clearly define requirements for engineered items.requirements for engineered items.

• Engineering drawings are usually created in Engineering drawings are usually created in accordance with standardized conventions accordance with standardized conventions for: for:

• layout, layout,

• nomenclature, nomenclature,

• interpretation, interpretation,

• appearance (such as typefaces and line appearance (such as typefaces and line styles), styles),

• size, etc. size, etc.

StandardisationStandardisation

• What do we mean by What do we mean by standardisation?standardisation?

• Discuss in groupsDiscuss in groups

• Will Engineers in Japan understand Will Engineers in Japan understand the drawings made in this country?the drawings made in this country?

• It means consistent , all the same, It means consistent , all the same, identicalidentical

What needs to be What needs to be standardised?standardised?

• Discuss in groupsDiscuss in groups

Standards and ConventionsStandards and Conventions

• Standards and conventions for: Standards and conventions for:

• layoutlayout

• line thicknessline thickness

• text sizetext size

• SymbolsSymbols

• view projectionsview projections

• descriptive geometrydescriptive geometry

• dimensioning dimensioning

What information would you What information would you need to make an item?need to make an item?• What material will we useWhat material will we use• Dimensions- what size will it beDimensions- what size will it be• Imperial or metric measurement – how are Imperial or metric measurement – how are

the sizes measured?the sizes measured?• Tolerances – how accurate do the Tolerances – how accurate do the

measurements need to be – limits and fitsmeasurements need to be – limits and fits• Surface texture – how smooth or roughSurface texture – how smooth or rough• How will it be made – what processHow will it be made – what process• Are there more than one partAre there more than one part• How will they be put togetherHow will they be put together