2. No matter how complicated the drawings are, we should follow the principle of three views. Understand the basic principles, and then look at complex drawings is simple, so look at drawings from simple map paper, step by step, from simple to complex, and accumulate experience.
3. Conventional drawings are divided into front view, top view, side view, some conventional symbols and technical requirements. There are many kinds of molds, different uses and complicated structures.
4. Common die drawing codes: G milling, TAN tangent point, PG optical curve milling, THR perforation, JG coordinate milling, bottom surface, W/C, W wire cutting, top surface, E, EDM discharge, SYM symmetry, L lathe, T thickness, int intersection, CB counterbore, C chamfer and gap.
The extended data map is a graphic expression, which indicates the details needed for construction, such as size, direction and technical parameters, and the engineering object that the owner wants to build. It contains two meanings, which are included in the contract as the work of drawing; Supplementary and modified drawings issued by the owner (or his representative) according to the contract. 1999 The definition of drawings in the contract model published does not include the drawings provided by the contractor.
Three-view relationship:
1, positional relationship:
These two axes locate three views: the front view is at the upper left of the drawing, the left view is at the right of the front view, and the top view is below the front view. The length of the front view and the top view should be aligned (called long alignment), and the height of the front view and the left view should be flush (called high alignment). The width of the left view and the top view should be equal (called equal width). If they are not arranged in the above order, the names of the three views should be pointed out.
2, the size relationship:
Firstly, it is clear that the three views of the object correspond to the six directions of the object: up, down, left, right, front and back. The outline of the front view represents four directions: up, down, left and right. The outline of the left view represents four directions: up, down, front and back; The outline of the top view shows four directions: front, back, left and right. Specify the length from left to right, the height from top to bottom and the width from front to back.
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