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Dimensions, Tolerance and Assemblies, Extension lines continue or extend…
Dimensions, Tolerance and Assemblies
Tolerance
Types
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Bilateral Tolerance
Allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
Dimensions
Dimension Text
The base dimension which 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 size 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
Types of Dimensions
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Dimensioning of Circle, Arc and Hole
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Extension lines continue or extend from the surface of the object and establish the size of the dimension. They do not touch the object lines and extend slightly past the dimension line.