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Dimensions, Tolerances and assemblies - Coggle Diagram
Dimensions, Tolerances and assemblies
Dimensions in Drawing
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Types of Dimensioning
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Chain Dimensioning
Should only be used if the function of the object would not be affected by the accumulation of the tolerances.
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Dimensioning of Circle,Arc, and Hole
A Circle is dimensioned by its diameter. An arc is dimensioned by its radius. Holes are located by their centerlines
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Extension line.continue or extend from the surface of the object and establish the size of the dimension
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
Tolerances
Tolerances are included with dimensions in engineering drawings to take into account manufacturing limitation
If Tolerance is not given, exact measurement of parts must be made.Rejection rate will be very high and is not realistic
The range of tolerance will translate into the manufacturing method needed, since different manufacturing method has different degree of tolerance
Same parts can be made from different companies and they have to be interchangeable. Tolerance ensures good quality control for parts from different companies
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Types of Tolerances
Bilateral Tolerance: Allowed to vary in two directions from the specified dimensions. Both direction need not vary by the same amount
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Assembly Modelling
Bringing in a base component, selected because of its central role, then each component brought in needs to be oriented and located relative to other component in the assembly. Assembly joints are used between elements of componenets
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