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Dimensions, Tolerance and Assemblies - Coggle Diagram

- - - - Consists of several dimensions originating from a common reference surface
    - - Simplifies parallel dimensions in order to reduce the space used on a drawing
    - - Should only be used if the function of the object would not be affected by the accumulation of the tolerance
    - - Uses both chain and parallel dimensioning
    - - Placing arrow heads between the extension lines may make the dimension very difficult to read. Arrow heads can be place outside the extension lines instead
    - - To dimension multiple same dimensions, use N x Dimension
    - - Radial dimensions start with capital 'R'
    - - A circle is dimensioned by its diameter
      - An arc is dimensioned by its radius
      - Holes are located by their centerlines
    - - Mark with a curved dimension line, and has the degree symbol
- - - - Allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount
    - - allowed to vary in only one direction
    - - the upper and lower limits of the dimension are specified
- - - - • In clearance fit, there would still be an allowance for two parts to move, such as in a door hinge
  - - - • In interference fit, it would be difficult to move (or remove) the two interfacing parts. Usually, a lot of force is needed to remove the two parts.
        
        Examples are shafts that are fitted through bearings, so that the shaft does not slip.
  - - - multiple parts are brought together to define a larger, more complex product representation
      - facilitates the collaboration among designers, engineers, manufacturing technicians and others to ensure a product assembly works.
    - - Constructing an assembly normally begins with bringing in a base component, selected because of its central role
      - Each component brought in needs to be oriented and located relative to other components in the assembly
      - Assembly joints are used between elements of components.
        
        types of joints in Fusion 360
        
        Rigid
        
        Fixed two components to one another; it provides no degrees of freedom
        
        Revolute
        
        Has a single rotational degree of freedom, much like a hinge
        
        Slider
        
        Cylindrical
        
        Pin Slot
        
        Planar
        
        Ball
    - - Information that can be found on a Bill of Materials
        
        Part number
        
        Material
        
        Quantity of Each Part