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Dimensions - Coggle Diagram
Dimensions
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Types of Dimensions
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dimensioning of circles, arc and holes
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Rules
-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
- Avoid dimensioning to hidden lines and features
- Dimension lines, extension lines and object outlines should not cross or overlap
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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calculating tolerance
- Tolerance = Upper limit – Lower Limit
clearance fit, there would still be an allowance for two parts to move
In interference fit, it would be difficult to move (or remove) the two interfacing parts.
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