amici CAD popularization small class - proportion, line width and drawing

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illustrate: The content discussed in this post is for drawings produced by the piping major, and should not be copied rigidly by other majors. Someone asked about line width settings before (mainly for piping drawings). In fact, this problem has appeared many times here. Although it was solved at the time, the discussion was not thorough. Let’s talk about the concept of proportion first.: First of all, the chemical pipeline drawing ratio is generally 1: 1. This ratio is convenient for cartography, and every cartographer can experience the convenience of "one-size-fits-all". After all, piping is not completed in one go and needs to be modified and adjusted repeatedly. 1: 1’s drawing is intuitive to adjust. Secondly, the ratio generally refers to the drawing ratio considered. For example, the ratio of piping diagrams is commonly used as 1.: 30,1: 50. Although the unit used for piping is mm, the length is often tens or even hundreds of meters. If you press 1: 1 The picture is obviously inappropriate. At this time, a problem arises, 1: The drawing of 1, why is it only 1?: 30 pictures? Reduce image size? Obviously it is more appropriate to enlarge the frame, for example, the ratio is 1: 30, then the picture frame will be enlarged 30 times, so that the picture can fit into the picture frame in a proportional manner. Also add the issue of the proportion of print settings for dot spray images (printing). Whether it is made into a PLT file or directly printed, you may need to make small drawings A3\A4, or large drawings A0\A1, etc. Just select the required drawing size, and then the printing ratio does not need to worry about how much to set. It is unified into "zoom by drawing space". Of course, the premise is to press 1: 1 drawing. By the way, there is a line width in the title, is it lost? No matter how you draw or produce a drawing, line width must always be involved. Regarding the distribution control drawing, it is said that there are regulations in the national standard, but I don’t know the details. We have our own regulations here. Just give an example to illustrate the problem, single line is 0.8, double line is 0.6. Compared with mechanical drawing, this is strange. Since there are line width requirements, you can set the line width and color control in the layer (I don’t know much about this method). Why bother playing with the proportion? The reason is, let’s start with the drawing scale. Since the picture is 1: Drawn by 1, the ratio is 1: 30 (take 1: Taking the ratio of 30 as an example), the picture frame is enlarged 30 times due to the ratio. So the original single line 0.8 and the double line 0.6 were enlarged 30 times to coordinate the drawing, and became single line 0.8. * 30=24mm, double wire 06 * 30=18mm is more coordinated? Obviously, when it comes to 18mm and 24mm, CAD's own line width cannot meet the requirements. In fact, the commonly used lines for piping are polylines, not straight lines. The PL line is editable and can be adjusted to the proportionally converted line width. This post was last edited by amici on 2009-3-11 14:57 ]