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Dimension, Tolerance and Assemblies - Coggle Diagram
Dimension, Tolerance and Assemblies
Tolerance
Tolerances are included with dimensions in engineering drawings to take into account these manufacturing limitations.
3 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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9 types of Dimensions:
Parallel Dimensioning: Consists of several dimensions originating from a common reference surface (also known as a datum).
Superimposed Running Dimensioning: Simplifies parallel dimensions in order to reduce the space used on a drawing.
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 Small Features: Placing arrow heads between the extension lines may make the dimension very difficult to read. Arrow heads can be placed outside the extension lines instead.
Dimensioning of Multiple Features: To dimension multiple same dimension, use N x Dimension.
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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.
Dimensioning Angles: It is marked with a curved dimension line, and has a degree symbol.
Assembly
In order to bring a product to life, very often, multiple parts and components are needed.
In clearance fit, there would still be an allowance for two parts to move, such as in a door hinge.
In 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. Examples are shafts that are fitted through bearings, so that the shaft does not slip.
Multiple parts are brought together to define a larger, more complex product representation
How Assembly Works?
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.