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Dimensions & Tolerance - Coggle Diagram
Dimensions & Tolerance
Dimensions in Drawings
1. 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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4. 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.
5. 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
Type of Dimensioning
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Dimensioning of Circle, Arc, and Hole
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Tolerances
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Types of Tolerance
1. Bilateral Tolerance: allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
- Unilateral Tolerance: allowed to vary in only one direction
- Limit Tolerance: the upper and lower limits of the dimension are specified
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