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Lesson 6 - Coggle Diagram

- - - - 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
    - - upper & lower limits of dimension is specified
- - - - units indicated on the bottom corner of the drawing
      - units in mm
    - - ±(number) is tolerance
      - defines how much dimension is allowed to deviate
    - - arrowhead on each end
    - - continues or extend from the surface of the object
      - establishes the size of the dimension
      - does not touch the object lines
      - extends slightly past the dimension line
    - - gap between the object surface and extension line
      - to prevent confusion with the visible lines of the model
  - - - consisits of serveral dimensions originating from common reference surface
    - - simplifies parallel dimensions in order to reduce space used on drawing
    - - only be used if the function of object would not be affected by accumulation of tolerances
    - - uses both chain and parallel dimensioning
    - - place arrow heads outside extension lines when its gets hard to read
    - - multiple same dimensions, use N * Dimension
    - - radial dimensions start with R
      - arrow to be pointed in the curve of the arc
    - - circle dimensioned by its diameter
      - arc is dimensioned by its radius
      - holes are located by their centerlines
    - - marked by curved dimension line and has degree
- - - - fixes two components to one another; it provides no degrees of freedom
    - - single rotational degree of freedom, much like a hinge