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Technical Drawing - Coggle Diagram

- - - - Dimension each measurement once, on the view where it appears at true size. Extension lines: they start 1 mm away from the outline and go 2–3 mm past the dimension line. Dimension lines: thin, parallel to the edge, with an arrow at each end, drawn outside the shape, 8–10 mm from the outline. The number goes above the line (or to the left of a vertical line), never on it, and never inside the part. Millimetres, no unit written. Angles in degrees, diameters with Ø, radii with R. Group dimensions in rows (parallel to a common base) instead of chaining them all over the drawing
    - - Using the outline as a dimension line, with the number written inside the part. It is confusing: the reader cannot tell which line is the object and which is the dimension. 2. Extension lines touching the object (they need a 1 mm gap) and the number written on the line instead of above it. 3. Writing the unit ("55 mm") and repeating the width, which was already given. Each dimension is written once and millimetres are never written
- - - - An edge that exists but is covered by material. It must start and finish with a dash, and never touch the outline
    - - The axis of a hole, a cylinder or a symmetrical part. It goes 2–3 mm past the outline.
    - - All the lines that measure the part. They are never drawn thick, because they are not part of the object.
    - - The outline and every edge you can see from that position. The thickest line on the drawing
- - - - You draw all three views yourself, one by one.
        
        The program generates the three views from the model in seconds.
    - - Draw lines, circles and arcs on a flat plane, with exact coordinates.
        
        Sketch a flat profile and then extrude or revolve it to get a solid.
    - - Plans, electrical and electronic circuits, layouts, templates
        
        A solid model: you can measure its volume, check that parts fit, render it, print it.
    - - Fast for diagrams and 2D plans, and lighter to learn.
        
        One change in the model updates every view. No contradictions between views.
    - - Schematics, circuit diagrams, the plan of a room.
        
        Onshape for the parts and the assembly (Tasks 2.2 and 2.3), then STL to the 3D printer.