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Lesson 11 - Coggle Diagram
Lesson 11
Tolerances
The 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
There are three types of tolerance: Bilateral Tolerance: allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount. Unilateral Tolerance: allowed to vary in only one direction Limit Tolerance: the upper and lower limits of the dimension are specified
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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:
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Dimensions in Drawings
Types of Dimensioning
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Dimensioning of circle, arc and hole
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
Assembling Multiple Parts
In order to bring a product to life, very often, multiple parts and components are needed.
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