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dimensions, tolerance, assemblies - Coggle Diagram
dimensions, tolerance, assemblies
dimensions
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types of dimensioning
parallel (datum) dimensioning ; consist of several dimensions originating from a common reference surface
superimposed running dimensioning ; simplifies parallel dimensions in order to reduce the space used on drawings
chain dimensioning ; only used if the function of the object would not be affected by the accumulation of tolerance
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dimensioning of circle, arc, hole ; circle- diameter , arc- radius, holes- centerlines
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rules for dimensioning
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dimension lines, extension lines and object outlines should not cross or overlap
tolerance
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importance of tolerance
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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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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assembling models
multiple parts are brought together to define a larger, more complex product representation
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.
joints involved
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Revolute Joint: Has a single rotational degree of freedom, much like a hinge