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Dimensions & Tolerance - Coggle Diagram
Dimensions & Tolerance
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Types of Dimensioning
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Chain Dimensioning
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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 Radius
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Radial dimensions start with capital 'R'
(a) shows a radius dimensioned with the center of the radius located on the drawing
(b) shows how to dimension radii which do not need their centers locating
Dimensioning of Circle, Arc, and Hole
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- A circle is dimensioned by its diameter
- An arc is dimensioned by its radius
- Holes are located by their centerlines
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Rules of Dimensioning
Dimensions should not be duplicated, i.e. same dimension should not be repeated on different views, or the same information need not be given in two different ways
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Dimension lines, extension lines and object outlines should not cross or overlap
Importance of Tolerance
In practice, parts cannot be manufactured exactly to the dimensions stated in the drawing, due to manufacturing variations. Tolerances are included with dimensions in engineering drawings to take into account these manufacturing limitations.
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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Calculate Tolerance
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Tolerance is defined as the difference between the upper limit of a dimension and the lower limit of the dimension
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Interference Fit
the minimum shaft diameter is 49.8, which is larger than the maximum hole diameter of 49.5. Hence, this would be an interference fit.
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