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Dimensions, Tolerance and Assemblies - Coggle Diagram
Dimensions, Tolerance and Assemblies
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1) Parallel Dimensioning (it consists of several dimensions originating from a common reference surface),
2) Superimposed Running Dimensioning (Simplifies parallel dimensions in order to reduce the space used on a drawing)
3) 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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5) Dimensioning Small Features (Placing arrow heads between the extension lines may make the dimension very hard to read. They can be placed outside the extension lines instead)
6) Dimensioning of Multiple Features (To dimension multiple same dimensions, use N x Dimension)
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8) Dimensioning of Arc, Circle and Hole (A circle is dimensioned by its diameter, an arc is dimensioned by its radius and holes are located by their centerlines)
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Dimension lines, extension lines and object outlines should not cross or overlap
If tolerance is not given, exact measurement of the 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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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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Tolerance is defined as the difference between the upper limit of a dimension and the lower limit of the dimension. Its formula is given by:
Tolerance = Upper limit – Lower Limit
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Interference fit (It would be difficult to move, or remove, the two interfacing parts. Usually, a lot of force is needed to remove the two parts)
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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
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contains a Bill of Material, which is a source of information of a list of parts and the corresponding quantities required to create a product