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Mechanical Drawing - Coggle Diagram

- - - - Thin or section lines: thin lines used for section views or hatching, dimensions and projections.
      - Thick lines: continuous lines used for visible edges and outlines.
      - Dashed lines: short-dashed (dotted) lines used for hidden details
      - Chain lines: short and long-dashed lines that make it possible to identify the centre of a circle.
      - Extension lines: parallel lines that extend out from two points on the drawing.
      - Dimension lines: thin lines that have an arrow on either end and are drawn between two extension lines, with the dimension written alongside.
- - - - The view on the plane of the drawing is obtained by projecting each feature of the object from one or more points at a infinite distance.
    - - The axonometric projection is the drawing of the object realized in a single view, usually the most important one.
        
        The isometric projection is a method in which the three axes (x,y,z) are displayed so that they form equal angles of 120° on the axonometric plane.
        
        The dimetricprojection: the dimensions projected by the object are the reflection of the real ones on the axis x and z, but are reduced on the y axis.
        
        The trimetricprojection: the direction of viewing is such that all of the three axes of space appear unequally foreshortened.
      - The orthographic projection: an object is represented in multiple views, projected one by one on the representation plane from an infinite distance point of view.