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Dimensions, tolerances and assemblies - Coggle Diagram
Dimensions, tolerances and assemblies
Features of a dimension
Dimension text : It is the base dimension. Usually the units (in mm) is not indicated on every dimension text but at the bottom corner of the drawing.
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Extension line: Extension lines continue or extend from the surface of the object and establish the side of the dimension. They do not touch the object lines and extend slightly past the dimension line.
Extension line offset: A gap between the object surface and the extension line, so it is not confused with the visible lines of the model.
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Types of dimensioning
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superimposed running dimensions: Simplifies parallel dimensions in order to reduce the space used on a drawing.
Chain dimensioning: Should only be used if the function of the object would not be affected by the accumulation of the tolerances.
Dimensioning small features: Pllacing arrow heads between the extension lines may make the dimension very difficult to read. Arrow heads can be placed outside the extension lines instead.
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Dimensioning of circle, arc and hole: A circle is dimensioned by its diameter. An arc is dimensioned by by its radius. Holes are located by their centerlines.
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