Using shortcut commands for CAD drawing can improve drawing speed and efficiency. Using these instructions to learn and use them will bring unexpected results to our drawing work. However, there are hundreds of drawing commands in CAD. It is not only cumbersome but also unnecessary to master all these instructions. Practices have proven that using AUTO CAD to improve drawing speed and efficiency is the use of template maps, the use of current points, blocks and attributes, clever use of command combinations, and flexible use of layers and Ucs. This article allows you to fully experience the charm of these features. First, the sample map A template map is a sample used to create a mapping environment for a new graphic when drawing a new graphic. These include the layer, the line shape of each layer, the color, the size of the word when labeling, the aspect ratio of the word, the size of the arrow, the range of the drawing, and so on. The template image can even contain some common graphics, such as frame, title bar, roughness symbol, etc. Any common parameters, graphics, etc. can be placed in the template image. This facilitates the sharing of graphics using the template map. Drawing on a suitable template map can bring the following benefits: (1) no need to repeat settings The common parameters of various graphics are many, such as the size of the arrow, the height of the word, the color of the layer, and so on. If you don't use the template, we have to set each graphic. If we use the template map we only need to set it once, so we save a lot of drawing time. And the standardization of drawing can be achieved. (2) The template map itself is a highly utilized gallery. You can store frequently used symbols, such as roughness symbols, design reference symbols, screw nut symbols, etc., in separate pieces in the template image, which can be easily recalled and inserted into the desired position when needed. Just fine. It is also possible to put the commonly used or serialized part drawings in the factory into the template drawing for future recall. Therefore, the longer the drawing time, the more tiles remain in the template image, and the faster the drawing will be in the future. (3) Set layers in the template diagram and specify the scope of use of each layer In this way, it can ensure that the line type and color of each sample drawing are consistent, which can ensure that multiple drawings are simultaneously output when using a large plotter, ensuring that all graphic frame sizes and font sizes are consistent, and the drawing can be saved, and the drawing is convenient. Management, etc. Second, the command combination application In the process of using Auto cad for a long time, based on the proficiency of various commands, it can be found that several combinations of commands can be used to conveniently reduce the trouble of command conversion. (1) Combination of offset and Trim commands In the drawing process, it is no exaggeration to say that if you can master the combination of these two commands, then you can complete the general drawing. In the process of using, first draw the design basis, then use the Offset command. Then trim with Trim. This way you can save a lot of coordinate input. Don't worry about painting long or short: The first step is to generate a basic pattern based on the graphics that the drawing needs to have on the Offset. The second step is to use the Trim command to cut off any extra lines or arcs. It's like weaving work, weaving the basic graphics, and the final job is to trim the excess material in order to get the final sample. (2) Scale: Scale command can change the size of existing entities Although it is very similar to the Rotate command, it gives a new feel compared to the Rotate command. For example, when drawing a magnified view of a part of a pixel, first copy the part to a blank position using the copy command, then trim the extra part with the Trim command, and then zoom in directly using the Scale command. There is also a Reference option in the Scale amplification factor. You can do this with reasonable options: 1) Scale the entity using absolute length For example, the current length of one side of an entity is 4.8 drawing units, and now it is enlarged to 7.5 units long. The usual practice is to calculate the relative scaling factor of 1.5625, and then enter the value to enlarge the entity. Use the "Reference" or "R" option to indicate that the current length is 4.8, and then add a new length of 7.5 as required. You can also specify the two endpoints of the line you want to scale to display the reference length and then indicate the new length you want. 2) Re-scaling the entire graphic If the user feels that the original drawing unit is not suitable, you can use this command to select all the entities in the figure (window selection), then use the "Reference" item to specify the two endpoints of the known length entity, and then indicate the required new The length, so all entities in the graph will be rescaled as required. 3) The current point and the current point of Ucs are drawn to the last point of the current time. The use of the current point is actually closely related to the relative coordinates. In the drawing process, calculating the coordinates of a point is very cumbersome and error-prone, and it is impossible to calculate its absolute coordinates based on the given conditions. The labels on the drawings are actually relative labels. If you move the current point to one end of the label and determine the position of the other end, you can directly use the paper size and use the relative coordinates. The method of moving the current point is very simple. Use the Line command to move the current point to the known end of the dimension line at the "From" prompt, and press Enter in the subsequent "To" state. The current point has moved. Other commands can then be used. You can also use Ucs or user coordinates to move the user coordinate origin to the known end of the label, and determine the other end to use the absolute coordinates directly. Third, the block and attributes Blocks are a simple and convenient entity for combining complex graphics, which is treated by Auto cad as a single object. Let's look at the important functions of the block: (1) Create a gallery Using the nature of the block, you can define a set of objects in the current drawing, or a block of a previously independent graphic, or you can use the commonly used pixels as a block and store it in the template. In this way, the user's own "parts" library is actually created. It can be called directly when drawing other graphics. Even we can use blocks to block some smaller detail maps and form a whole map in the same way as "building blocks". Frequently used graphics can be completed in one pass without having to repeat the production. This greatly speeds up the drawing. (2) save memory and disk space
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