The marking of mechanical drawings is like the eyes of mechanical drawings. This article makes a few narratives on how to do this "painting point" work in a concise, accurate and standardized way. 1. The self-evident label often encounters some unmarked dimensions on the pattern, and the objective existence of these dimensions is well-recognized and self-evident. These dimensions are not marked, which will make the drawings clearer; if they are marked, they will be cumbersome. (1) Graphical relationship size. Since the drawing is drawn in an ideal state, there are some graphical relationships, such as the tangent of the contour, the surface.
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