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Dimensions, Tolerances and Assemblies - Coggle Diagram
Dimensions, Tolerances and Assemblies
Dimension
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 of Dimensioning
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Dimensioning of Circle, Arc, and Hole
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Rules of Dimension
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Dimension lines, extension lines and object outlines should not cross or overlap
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Tolerances
Important of tolerance
parts cannot be manufactured exactly to the dimensions stated in the drawing, due to manufacturing variations.
Type of tolerance
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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.
Assemblies
Assembling modelling
In an assembly model, multiple parts are brought together to define a larger, more complex product representation.
Constructing an assembly normally begins with bringing in a base component, selected because of its central role. Each component brought in needs to be oriented and located relative to other components in the assembly. Assembly joints are used between elements of components.