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Dimension, Tolerances & Assemblies, , . - Coggle Diagram

- - - - What?
        
        Dimension Text displays the size of the object
      - Units
        
        Usually in mm (Unit not indicated in the text but it's shown in the title block)
    - - What?
        
        By how much the dimension is deviated
      - By how much?
        
        ±0.2 Is the tolerance
    - - What
        
        Arrow Head on each end
    - - What
        
        It continue or extend from surface of the object and establish the size of the dimension.
        
        Extension Lines do not touch the object.
    - - What
        
        Gap between the object surface and the extension line
      - Why
        
        so that it is not confused with the visible line on the model
  - - - What
        
        Consist of several dimensions originating from a common reference surface
    - - Why
        
        Reduce space used on a drawing
      - What
        
        Simplifies parallel dimensions in order
    - - What
      - When
        
        Use only if the function of the object would not be affected by the accumulation of the tolerances.
    - - What
        
        Uses both chain and parallel dimensioning
    - - How
        
        Place arrow head outside the extension line
      - What
    - - What
      - How
        
        Dimension multiple same dimensions, use N x Dimensions.
    - - What
    - - What
      - How
        
        Circle is dimensioned by its diameter.
        
        Arc is dimensioned by its radius
        
        Holes are located by their centerlines
    - - What
      - How
        
        Mark using curved dimension line and has the degree symbol
- - - - the upper and lower limits of the dimension are specified
    - - the upper and lower limits of the dimension are specified
    - - allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
  - - - an air space or clearance which exists between the shaft and holes
  - - - fit between two parts in which the external dimension of one part slightly exceeds the internal dimension of the part
- - - - Rigid
        
        What
        
        Fixes two Component to one another
      - Revolute
        
        What
        
        Has a single rotational degree of freedom, much like a hinge.
      - Sldier
      - Cylindrical
      - Pin Slot
      - Planer
      - Ball