If dimension is a whole number, neither the decimal point or a zero is shown (14). › When a metric dimension is a whole number the decimal point and zero are omitted (Ex.Metric Dimension Notes: Drawing must state the units used and certain other information used in the drawing: ALL DIMENSIONS IN MILLIMETRES UNLESS STATEE OTHERWISE –» DRAWING IN ACCORDANCE WITH THE STANDARD REFERENCED IN BS8888: 2004 –» COMPONENTS/PARTS TO BE STAMPED WITH THEIR PLANT IDENT NUMBER WHERE MARKED/SHOWN IN LETTERS AT LEEAST 3MM HIGH. The follwing shall be observed where specifying millimeter dimensions used on drawings. Decimal dimensioning shall be used on mechanical drawing. Drawing errors create Disagreements over drawing interpretation –» Difficulty communicating drawing requirements –» and Designer's intent can not be understood.ĭimensions: A numerical value expressed in appropriate units of measure and used to define the size, location, orientation, form or other geometric characteristics of a part. › Part documentation such as part number and drawing revisionĭrawing errors compound the cost of the errors (money, time, material, and customer satisfaction) as we move further from initial design to production.
› Material, heat treat, surface coatings.GD&T & TYPES OF DIMENSIONING – ANSI Y14.5Īn engineering drawing may communicate the following:
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