AutoCAD application skills selection 20

CAD is the abbreviation of Computer Aided Design, refers to computer-aided design, Autodesk's AutoCAD is currently widely used CAD software, with sophisticated graphics rendering capabilities, powerful graphics editing capabilities, It can be used for secondary development or user customization in multiple ways, can convert a variety of graphic formats, has strong data exchange capability, supports multiple hardware devices and operating platforms, and can adapt to buildings through various application software. Design needs in industries such as machinery, surveying, electronics, clothing, and aerospace.

1. Execute the edit command, prompting to select the target, use the rectangular box to select, drag the cursor from left to right, as the window "Windows", if right from left to left Drag the cursor to the "cross*Cross" mode.

2. When inputting points relative to coordinates, in the orthogonal state, the general input is: @x, 0 or @0, y

(for example, input relative coordinates <;100, " ; indicates that the next point is increased by 100 relative to the upper X direction, and the input relative coordinate <;@0,50” indicates that the next point is increased by 50 relative to the upper point of the Y direction. In the above two cases, you can directly input 100 or 50. Achieve the same purpose, saving input time.

3. In AutoCAD, there are sometimes *point markers generated at the mouse click. Use the BLIPMODE command to enter OFF at the prompt line to eliminate it.

4. When using AutoCAD, some users will find that the dialog box in the command will become a prompt line. For example, if you print the command, it is controlled by the system variable CMDDIA. Turn it off.

5. Whether the ellipse generated by the ellipse command is a polyline or an ellipse is determined by the system variable PELLIPSE. When it is 1, the generated ellipse is PLINE.

6. The CMDECHO variable determines whether command line echo is generated. It should be set to 0 during program execution.

7. DIMSCALE determines the scale of the dimension, the value is an integer, the default is 1, it should be better to change the scale when the graph has a certain scaling.

8. In the higher version of CAD, the geometric tolerance labeling is provided, but the circle in the roundness and the coaxiality is not round enough. In fact, the common symbol definitions in AutoCAD are in the SUPPORT subdirectory under the AutoCAD installation directory. In the gdt.shp file, the characters 2 and 4 define the shape of a circle, and the arc of the circle is actually 127 & deg;, but it is not very well corrected (such as 90 & deg; more not good).

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9. The hollow Chinese character glyph uses the BONUS function in AutoCAD R14 (must install AutoCAD completely, or choose it during custom installation), there is a TXTEXP Commands can be used to blow text into lines, which is very useful for making stereo words.

10. There is an ARCTEXT command in BONUS of AutoCAD R14, which can realize the output of curved text. The method is to select the arc first, then input the text content, press OK.

11. There is a useful command in BONUS, MPEDIT, which uses it to modify multiple lines into a polyline and change its line width.

12. The Image command replaces the commands such as BMPIN and PCXIN in R13 in R14. It embeds the bitmap into the file and only displays it. If it is blown up, it becomes an empty frame. How to use it? Commands such as PCXIN are reproduced? Please copy the RASTERIN.EXE in the R13 installation directory into R14, load it with appload, and then import the bitmap (can be edited, can be exploded).

13. The BREAK command is used to interrupt the entity, and the user can also disconnect the entity at a time. After the first point is selected, enter “@”. A line is usually a dotted line and the other is a solid line.

14. AutoCAD R14 provides a large number of command abbreviations. Many R13 commands without abbreviations also have abbreviations. The following provides a single-character abbreviation in CAD: A: ARC, B: Bmake, C: Circle , D: ddim, E: erase, F: fillet, G: group, H: bhatch, I: ddinsert, L: line, M: move, O: offset, P: pan, R: redraw, S: stretch, T :mtext, U:undo, V:ddview,W:Wblock,X;explode,Z:zoo, can be used in large quantities, it will be faster than the mouse point after use (especially when ls loses 5 characters). AutoCAD Professional 3S Station 3s8.cn

R14 has greatly expanded the simplified commands, not only adding the simplified initial command (not listed here), but also adding the simplified command with the first two letters. Often such as: array, copy, dist,

donut, dtext, filter, mirror, pline, rotate, trim, scale, snap, style,

units, etc., more improved keyboard The speed of entering commands is a breeze for friends who are familiar with the keyboard.

15. The abbreviation of AutoCAD R14 command can also be used in R13 by copying ACAD.pgp in the Support subdirectory under AutoCAD

R14 to the Support subdirectory in AutoCAD R13.

16. The ACAD.pgp file in AutoCAD is very important. It records the command abbreviations. Users can customize them in the following format: <Command Abbreviation> *Command Name. System commands can also be defined. AutoCAD R14 provides the sh command and can execute DOS commands, but it is not very big under Windows.

17. In AutoCAD R14, the system commands such as NOTEPAD, EDIT, DIR, DEL, etc., I think that NOTEPAD is more useful for custom CAD, but it will find that the screen flashes (into DOS), and Back, it's very unpleasant, let's make a small program, named note.lsp:

(defun c:notepad()

(startapp″notepad″)

)

First delete the NOTEPAD command definition line in ACAD.pgp. After re-entering the CAD, load the program command: (load″note″), the next time you use the NOTEPAD command. For better results, it is best to add (load″note″) to ACADR14.lsp in the Support subdirectory. Professional 3S Station 3s8.cn

18. The line width of AutoCAD R14 can be set by color, so that various lines with different line types and different line widths can be placed in different layers in mechanical drawing. The color of the line type is defined in the layer, and the relationship between the line type and the color is set in the print setting, and the effect is good.

19. ACAD.dwt is the default template in AutoCAD R14 Support. It should be processed well, and the commonly used layers, blocks and label types are defined. Adding standard frames can save a lot of repetition. jobs.

20. There are a lot of external Lisp command files in AutoCAD, you can directly observe them. If you are learning to develop Lisp applications, note that R14 is the last version of Lisp file content published in AUTOCAD, in CAD2000 Lisp file content It is encrypted (I am researching the decryption program).