DimensioningIntroductionNot only do you need to describe the shape of an object, but also you mustgive the design a complete size description; you must give it dimensions,DimensionsAlways give dimensions that are convenient for the shop worker orproduction manager. Work should never stop for mathematical computationsthat should have been on the drawing. Make dimensions clear and concisewithout duplication or the necessity to calculate, scale, or assume.Types ofdimensionsTwo general types of dimensions are size dimensions and locationdimensions. Size dimensions define the size of the simple geometric shapeswithin a part. An example of a size dimension is the diameter of a hole orthe width of a slot. Location dimensions define the location of thesegeometric shapes in relation to each other. An example of locationdimensions is how far apart holes or slots are from each other.DimensioningDimension your drawings by first geometrically analyzing the object and thenprocedurereviewing the procedures by which the object will be made and surfaced.To analyze a dimension problem, follow this table:StepAction1Mentally divide the object into component geometric shapes.2Place size dimensions on each component part where they bestdescribe the object.3Select a locating centerline.4Place location dimensions so that each geometric shape relates to acenterline or finished surface.5Add overall dimensions (length, width, and height).6Add all notes required to complete the description of the object.Continued on next page3-27
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