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Dimensions and Tolerance - Coggle Diagram
Dimensions and Tolerance
Components
Dimension Text
This 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 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
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Dimensioning of Circle, Arc, and Hole
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Rules
Dimensions should not be duplicated, i.e. same dimension should not be repeated on different views, or the same information need not be given in two different ways
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Dimension lines, extension lines and object outlines should not cross or overlap
Types of tolerance
Bilateral Tolerance: allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
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