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DIMENSIONS, TOLERANCE AND ASSEMBLIES - Coggle Diagram
DIMENSIONS, TOLERANCE AND ASSEMBLIES
DIMENSIONS
TYPES OF DIMENSIONS
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 dimensions, use N x Dimension.
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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.
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
Superimposed Running
Dimensioning Simplifies parallel dimensions in order to reduce the space used on a drawing.
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Parallel Dimensioning (Datum Dimensioning) Consists of several dimensions originating from a common reference surface (aka the datum).
RULES OF DIMENSIONING
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Dimension lines, extension lines and object outlines should not cross or overlap
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TOLERANCE
TYPE 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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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.
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