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Lesson 6 - Coggle Diagram
Lesson 6
Dimensioning
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Dimensioning of circle, arc and hole.
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Types of joints
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Revolute
Has a single rotational degree of freedom, much like a hinge.
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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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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
Types of tolerances
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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Interference fit
In the below image, 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.