Transcription of GEOMETRICAL TOLERANCING
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GEOMETRICAL TOLERANCING
IT,Sligo Computer Aided Design Geometric Tolerances 1 GEOMETRICAL TOLERANCING Introduction In a typical engineering design and production environment, the designer of a part rarely follows the design to the shop floor, and consequently the only means of communication of the design intent are the design drawings. Problems of validation and interpretation of design arise when the drawings do not clearly reflect what the designer intended, when they do not communicate to manufacturing how the design should be implemented and when the drawings are subjected to a number of different interpretations The use of linear tolerances when dimensioning the part can control the size of a product.
must be parallel to – and that feature is referred to as the datum). Datums: Datums are used to establish the relationship of geometrically toleranced features and a datum is a theoretically exact geometrical reference, such as an axis, plane, straight line, etc. The datum is indicated by an equilateral triangle symbol
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