Engineering drawings communicate product design and manufacturing information in a reliable and unambiguous manner regardless of language Information in engineering drawings are a legal specification that carry a binding contract…

Standards. Engineering drawings are a language in its own right As in any language certain rules (or standards) must be followed: ? Defines how shape and form of object is to be represented [i.e., the order of orthographic views and different line types] ? Defines how the part is to be dimensioned and toleranced Standards are updated on a 5 year basis BSI – British Standards Institute ANSI- American National Standards Institute DIN – Deutsches Institut fur Normung ISO – International Standards Organization. Engineering Drawing Requirements. Unambiguous and clear: ? [only one interpretation possible] Complete ? [Provide all information for all stages of manufacture. i.e., detailed drawings, assembly drawings, bill of materials] Suitable for duplication ? [Suitable scale and clarity that the drawing can be copied – even micro copied – with out losing quality] Language independent ? [Words dependent on a language should only be used in the title block; words should be replaced by symbols] Conforms to standards ? [Highest standards are ISO as numerous countries learn these rules] Types of Drawings. Design Layout Drawing: ? Represents broad principles of feasible solution Detail Drawing ? Single part drawing containing all information for fabrication Assembly Drawing ? Shows how individual parts are combined, refers to parts list] Arrangement Drawing ? Shows finished arrangement of assemblies, includes functional and performance requirements Diagram ? Drawing depicting the function of a system Parts List [Bill of Materials] ? A parts this including material, number and provides reference number Drawing List ? Cross references drawings that all combine to produce an single Product. Layout. Conventional ‘A’ sizes of drawing paper Blank drawing sheets contain the following: ?Title block [includes organization, drawing number, title, date, name of draftsman, scale, copyright, projection symbol, units, reference to standard, sheet number, number to total sheets] ?Frame ?Centering marks ?Orientation marks ?Metric reference graduation ?Grid reference ? Trimming…

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