How To Write Dimensions In Engineering Drawing Five Basic Types of Dimensioning In Engineering Drawing Linear 2 Angular 3 Radial 4 Diametral and 5 Ordinate Dimensions are classified into Functional dimension F A dimension that is essential to the function of the part Non functional dimension NF A dimension that is not essential to the function of the part
Standard Practices Reading Direction All dimension and note text must be oriented to be read from the bottom of the drawing relative to the drawing format Placement of all text to be read from the bottom of the drawing is called unidirectional dimensioning Aligned dimensions have text placed parallel to the dimension line with vertical dimensions read from the Learn the fundamental rules of dimensioning in engineering architectural structural drawings This YouTube channel is dedicated to teaching people how to impr
How To Write Dimensions In Engineering Drawing
How To Write Dimensions In Engineering Drawing
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Dimensions In Engineering Drawing Explained ISO YouTube
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While defining dimensions on the drawing we should keep in mind some rules All dimensions on the drawing should be in the same specified units e g millimeters If we use other units for specific features the corresponding unit should be written with the nominal value 2 All the relevant dimensions of the object should be defined on the Extension lines on a drawing are fine dark solid lines that extend outward from a point on a drawing to which a dimension refers Usually the dimension line meets the extension line at right angles There should be a gap of about 1 16 where the extension line would meet the outline of the object and the extension line should go beyond
When calling out dimensions that are over 12 make sure ALL of dimensions are called out in total inches or feet inches throughout the entire drawing Either 4 5 or 53 they both mean the same thing but if there is a mix of dimensioning it can become easy to look at 4 8 and see 48 E Drawings should define the part without specifying manufacturing methods There are exceptions See standard F Nonmandatory manufacturing processing dimensions should be noted NONMANDATORY MFG DATA For example shrinkage allowance Final dimensions must be given on the drawing G Dimensions should be arranged for optimum readability
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2 Dimension datum of parts Datum select a group of geometric elements on the part as the basis for determining the mutual position relationship of other geometric elements According to different purposes the benchmark is divided into design benchmark and process benchmark Design datum the datum used to determine the exact position of the part in the assembly Engineering drawings employ various types of dimensions to convey different aspects of a design Understanding these types and their appropriate applications is crucial for effective dimensioning Linear Dimensions These are the most common type of dimension and are used to specify the length width or height of a feature
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