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Dimensions, Tolerances and Assemblies - Coggle Diagram

- - - - Defines the allowed deviations on dimension
      - Types of tolerances
        
        Limit tolerance
        
        Bilaterated tolerance
        
        Unilateral tolerance
      - Tolerance = upper limit - lower limit
    - - The gap between the object surface and extension line
        
        to not confuse extension line of models
    - - Base of dimension
        
        Units (mm) usually not indicated on dimension text
    - - Lines that extend from but do not touch the surface to establish size of dimension
    - - Dimensioning radius
        
        Start With R that shows the radius of a curve
      - Dimensioning multiple features
        
        N x Dimensions (N representing number of same dimension)
      - Dimensioning small features
        
        Dimension line placed outside of dimension text
      - combined dimensioning
        
        Chain + Parallel
      - Chain dimensioning
        
        only used when function of object would not be affected by accumulation of tolerances
      - Parallel dimensioning
        
        several dimensions originating from one commin reference surface
      - Dimensioning circles, arcs and holes
        
        By respective dimensioning : Diameter , radius and centreline
      - Superimposed running dimensioning
        
        simplifies parralel dimensions to reduce space used on drawing
      - Dimensioning angles
        
        Curved dimensioning