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Dimensions, Tolerance and Assemblies - Coggle Diagram
Dimensions, Tolerance and Assemblies
Dimensions
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Types of Dimensioning
- Parallel Dimensioning ( Datum Dimensioning)
Consists of several dimensions originating from a common reference surface ( also known as the datum.) 
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- Superimposed running Dimensioning
- Dimensioning Small Features
- Dimensioning of multiple features
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- Dimensioning of Circle, Arc and Hole
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Rules of Dimensioning
• Dimension lines, extension lines and object outlines should not cross or overlap
• 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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Generally, dimensions and drawings must be neat
Calculating Tolerance
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 : Tolerance = Upper limit - lower limit.
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Types of Tolerance
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Bilateral Tolerance
Allowed to "vary in two directions" from the specific dimension. Both directions need not vary by the same amount.
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Assembly Modelling
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Bill of Material (BOM) also known as Parts List.
You can find these information on a Bill of Material?
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Purpose of a Bill of Material ( Parts List)
The bill of material is a source of information of a list of parts and the corresponding quantities required to create a product