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Source: Mechanical Frontiers 01. What should I do if an abnormal error occurs when trying to open old images, causing the process to terminate? Create a new graphic file and insert the old image as a block. 02 What is the purpose of the template file? (1) Template drawings store all settings of a drawing; they may also contain predefined layers, dimension styles, and views. Template drawings are distinguished from other drawing files by the file extension [.dwt]. They are usually saved in the template directory. (2) If a new graphic is created based on the existing template file, changes made to the new graphic will not affect the template file. You can use a template file provided with the program, or you can create a custom template file. 03 When opening a DWG file, the system displays the [AutoCAD Message] dialog box, which states that [the drawing file is invalid]. What should users do when they’re told that the file cannot be opened? In this case, you can first exit the open operation, then open the [File] menu and select the [Graphic Utilities ‖ Repair] command; or type ‘recover’ directly in the command line using the keyboard. After that, enter the file that needs to be recovered in the [Select File] dialog box, and once confirmed, the system will begin the process of recovering the file. 04 Restoring drawings from backup files: First, make sure the file extensions are displayed (open “My Computer”, go to the “Tools” tab, then “Folder Options”; on the “View” tab, uncheck the box next to “Hide extensions for known file types”) ； Secondly, all files need to be displayed (open My Computer, go to the Tools tab, select Folder Options, then the View tab; in the Hidden items list, choose to Show hidden files, folders, and drives) ； Find the backup file again (its location can be found in AutoCAD’s [Tools] menu, Options, [File] tab, [Temporary Drawing File Location]), and rename it to the [.DWG] format ； Finally, open it using the same method used to open other CAD files. 05 What to do if the toolbars are missing in AutoCAD? Select the [Tools] menu, Options, the [Configuration] tab, and the [Reset] button ； You can also use the MENULOAD command, then click Browse and select ACAD.MNC to load it. 06 How to close *BAK files in CAD? (1) Select the [Tools] menu, then Options, and choose the [Open and Save] tab. In the dialog box, uncheck the checkbox next to [Create a backup copy each time it is saved]. (2) Alternatively, you can use the ISAVEBAK command to set the ISAVEBAK system variable to 0. When this system variable is set to 1, a [*BAK] backup file is created each time a save operation is performed. 07 How to adjust the box displaying coordinates at the lower-left corner of the drawing area in AutoCAD? Press F6 to switch. Or change the COORDS system variable to 1 or 2. When the system variable is 0, it means that the coordinate display is updated when a point is specified using a pointing device. When the system variable is set to 1, it means the coordinate display is updated continuously. When the system variable is set to 2, the coordinate display is updated continuously; when distance and angle are required, the distance and angle to the previous point are displayed. What should I do if the dialog box in command 08 turns into a command prompt? Change the CMDDIA system variable to 1. When the system variable is 0, it is the command line ； When the system variable is 1, it is a dialog box. 09 How to add commands and corresponding icons to AutoCAD panels? AutoCAD’s panel does not display all available commands; users must add them as needed. For example, if there is no mline command by default in the [Drawing] panel, it needs to be added manually. The steps are as follows: Select the [View] menu, then the toolbar, and the [Custom] tab; select the appropriate commands that will be displayed in the window on the right side of the dialog box. At this time, find the [Drawing] option in the [Command List] dropdown menu, locate the [Polyline] command, and right-click to copy it. In the 【All Files Custom Settings】dropdown list, select the 【All Custom Files】 option. Locate （Ribbon︱Panel︱2D Common Tab-Drawing）， right-click on 【Row 2】 within the 【2D Common Tab-Drawing】 options, paste the content, and then click OK to exit. 10 What should be done if, in AutoCAD, intersection marks appear at the location where the mouse is clicked? Using the SNAPMODE command, enter 0 at the prompt line to uncheck 【Enable Snapping】 and remove the marker. 11 How to control whether command-line echoing occurs? Change the CMDECHO system variable to 0 or 1. 12 Ways to Quickly Identify System Variables: The following methods can be used to determine which variable is problematic. For ease of description, name the file with issues as File 1, and create a new file named File 2 (it’s better to create a new file, as this way all variables will have default values; you can also use a file that is not problematic). Run SETVAR in each of these two files, click on the question mark and then press Enter; an AutoCAD text window will appear. Select the variables and copy them to Excel, then compare which variables differ from each other. This method helps **reduce the time required to query the variables**. For example: Suppose in a graph the variable ANGBASE is set to 90; then, if text is generated using a program, all characters in that text will be rotated by 90 degrees. Use the setvar command to list the variables, then copy and paste all of them into Column B of an Excel file. Create a new file, then use the setvar command to list the variables. Copy all of these variables and paste them into Column A of an Excel file. In cell C1 of that Excel file, enter 【=IF(A1=B1,0,1)】; use the drop-down functionality to calculate the values for all rows. After that, sort Column C in descending order. In this way, the variables with different values will be located in the first few columns, and by analyzing these variables, it will be easy to determine that there is an issue with the settings of the ANGBASE variables. 13 How to expand the drawing space? (1) Increase the system display resolution. (2) Set the [Appearance] option in the monitor properties to change the size of icons, scroll bars, title buttons, text, etc. (3) Remove unnecessary elements such as screen menus, scroll bars, and infrequently used toolbars. (4) Set the system taskbar to disappear automatically and minimize the command line as much as possible. (5) On the [Settings] page of the display properties, set the desktop size to one or two levels larger than the screen size, so that you can work in an extremely large working area. 1414. The difference between using 【-】 before a command and not using it: Using 【-】 or not using it has different meanings in AutoCAD. The use of 【-】 was introduced in AutoCAD 2000 and is a compatible command designed to ensure that commands have a uniform format across different language versions. Adding 【-】 before the command enables the command-line mode for that command; without it, the dialog box mode is used. To be more specific: when 【-】 is added, no dialog box appears during command execution, and all commands are entered in the command line. Without 【-】, a dialog box appears when the command is run, and parameter entry is done within that dialog box. 15 How to compare two graphs? One of the images can be turned into a block, and its color can be changed to a bright color such as yellow; then the two images can be overlaid on top of each other, and any discrepancies will be easily visible. 16 How to load it automatically after modifying ACAD.LSP? The system variable ACADLSPASDOC can be changed to 1. 17 What is acad【dumb chart】? Ready-made drawings that contain only lines and dimension lines, but no dimension values. 18 How can a graphic be viewed only without being able to modify it? Lock all layers so they remain unchanged when opened ； If it needs to be used again in the future, all the graphics can be broken down ； Another method is to write an encryption program in Lisp; once it runs, the graphics can only be viewed and not modified. 19 What scale is good for drawing in AutoCAD? It is best to draw at a 1∶1 ratio; the output ratio can be adjusted as desired. Drawing scale and output scale are two different concepts. When exporting, using 【1 unit of Output 1 = 500 units of drawing】 means exporting at a 1/500 scale, while 【10 units of Output 1 = 1 unit of drawing】 means exporting at a scale that is 10 times larger. There are many advantages to drawing at a 1:1 ratio. First, errors are easy to detect, as drawings are made based on actual dimensions, making it simple to identify any unreasonable settings in the dimensions. Secondly, marking dimensions is very convenient; the software measures the values itself, and if a mistake is made in drawing, it can be detected by looking at the dimension values (of course, the software also allows setting the dimension scaling factor, but that still requires extra effort). Third, when copying partial graphics between different diagrams or using blocks, since the scale is always 1∶1, it is easy to adjust the block size. Fourth, it is very convenient for assembling assembly drawings from part drawings or for breaking down assembly drawings into part drawings. Fifth, there is no need for complicated calculations of scaling up or down, which improves work efficiency and prevents errors that may occur during the conversion process. What are command aliases in 20? To facilitate command entry and avoid having to remember the full English names, command aliases (ALIAS) can be used to replace the commands. Entering C is equivalent to entering the CIRCLE command, while L is equivalent to the LINE command. Command aliases can **speed up the input of commands and improve drawing efficiency. Experienced users usually use their left hand to type commands and their right hand to move the mouse. Command aliases are set in the ACAD.PGP file, which can be edited using any text editor. AutoCAD provides the ALIASEDIT tool for modifying command aliases, allowing for interactive editing of aliases through a dialog box. 21 Before drawing, must the drawing limits (LIMITS) be set properly? When drawing new diagrams, it is best to set the boundaries according to national standard sheet sizes. The graphic boundaries are like the size of a drawing sheet; when drawing, everything takes place within these boundaries, making it easy to see everything clearly. It is convenient to print the diagrams drawn according to the layout, and automatic batch printing is also possible. Of course, some people are used to drawing multiple diagrams in a single graphic file, in which case setting diagram boundaries doesn’t make much sense. 22 What is the difference between an inclination angle and italic effect? The tilt angle and the italic effect are two different concepts; the former allows for setting any tilt angle, while the latter applies an italic effect based on a certain tilt angle. 23 How to set up the auto-save function? Set the SAVETIME variable to a smaller value, such as 10 (minutes). The default save time in AutoCAD is 120 minutes. 24 How to restore automatically saved graphics? AutoCAD saves automatically saved drawings in AUTO.SV$ or AUTO?.SV$ files. Find these files, rename them to the corresponding drawing file name, and they can be opened in AutoCAD. Generally, this file is stored in Windows’ temporary directory, such as C:\WINDOWS\TEMP. How to recover data when accidental saving overwrites the original image? If it was saved only once, promptly change the file with the BAK suffix to have a DWG suffix, and then open it in AutoCAD. If it is saved multiple times, the original image cannot be restored. 26 Why does the prompt appear in the command line instead of popping up an open or output dialog box? AutoCAD’s system variable FILEDIA is used to control the display of the file list dialog boxes. Setting FILEDIA to 1 will cause these dialog boxes to appear; if FILEDIA is set to 0, you can still get a dialog box displayed by entering the symbol 【~】 in response to the first prompt for the command you have selected. Of course, when calling a file operation command from a batch command or an AutoLISP/ADSRX/ObjectARX application, a command-line prompt is required, rather than a dialog box. 27 Why isn’t the date and time of a file updated in the file browser when it is saved? Autodesk has identified this issue; it only occurs in the Win95B operating system, and has never happened in Win95A or Windows NT environments. As a temporary solution, the system variable ISAVEPERCENT can be set to 0 in AutoCAD, causing AutoCAD to rewrite the entire drawing content every time it is saved. This may prolong the saving time, but it ensures that the file date is updated correctly. 28 Why can’t Chinese characters be displayed? Or did the entered Chinese characters turn into question marks? Reason list: (1) The corresponding font does not use a Chinese character font, such as HZTXT.SHX, etc ； (2) There are no Chinese font files in the current system ； The shape files used should be copied to AutoCAD’s font directory (usually ...\FONTS\) ； (3) For certain symbols, such as Greek letters, the corresponding font file must also be used; otherwise, they will be displayed as 【? 】 number. After running the 29PLOT and ASE commands, only a prompt appears in the command line, with no dialog box appearing – why? AutoCAD’s system variable CMDDIA is used to control the display of dialog boxes for the PLOT command and the ASE command; setting CMDDIA to 1 will achieve this. What to do if the 30 extra selections are invalid? The correct setting for CAD should allow for the selection of multiple objects sequentially, but sometimes this functionality fails, and only the last object selected can be chosen. The solution is as follows: Execute the OP (Options) command, go to the Selection tab, and uncheck the box labeled \"Add to selection with SHIFT key\". Unchecking this box enables adding items to the selection, while checking it does the opposite. What is the method for restoring with 31CAD command via three keys? What if the system variables in CAD are changed unintentionally, or if certain parameters are adjusted intentionally? In such cases, there is no need to reinstall anything or to make changes one by one; the solution is as follows: execute the OP (Options) command, go to the Configuration tab, and click the Reset button to restore everything to its original state. But after restoration, some options still require adjustments, such as the size of the crosshair. 32 How to verify and repair graphic files? Some unexpected errors can occur during drawing or editing; in such cases, the verification command can be used to examine the graphic and correct the errors. Checking graphic files refers to verifying the integrity of the object data of the graphics being edited. The AUDIT command can be used for checking; it is a diagnostic tool used to examine the current graphic and identify errors. For each error detected, an explanation is provided along with suggestions on how to correct it. The operation method is as follows: (1) Select the [File] menu, then the [Drawing Utilities] option, and finally the [Verify] option ； Or enter the command AUDIT and press the space bar or Enter key. (2) The command/prompt line asks [Do you want to correct any detected errors? 】, enter [Y] and press the space bar or Enter key. After completing the above steps, the system checks the current graphic file. After the inspection is complete, press F2 to switch to the text window, where you can see a result indicating how many errors were found in total and how many have been fixed. If a graphic file is found to be corrupted when opened, or if an irreparable error is encountered during verification, the repair command can be used to restore the graphic file. The steps are as follows: In the [Select File] dialog box that appears on the screen, select the folder and file name you want to repair, then click the [Open] button. At this point, a text window will appear on the screen, indicating that the object is being scanned, verified, and checked. Once scanning is complete, click the [OK] button. After completing the above steps, the graphic file will open and be regenerated on the screen. If there are some errors in the original graphic file, related issues may appear on the screen. To minimize data loss in the event of a system failure, it is important to develop the habit of saving data to disk promptly. 33. What should I do if a file takes up a lot of space and slows down my computer’s performance? Graphic files increase in size after being modified multiple times, especially when multiple blocks are inserted; as a result, the computer’s performance slows down, as does the speed at which graphics are processed. At this point, you can select \"Drawing Utilities\" from the \"File\" menu and then the \"Clean Up\" command to remove unnecessary blocks, fonts, layers, annotation styles, line styles, etc.; this will also reduce the size of the graphic file. What should users pay attention to when using the mouse wheel? When using the mouse wheel, users should pay attention to the middle button setting command mbuttonpan. In particular, some users install certain mouse drivers, which can cause the mouse wheel to stop working. This command is used to control the response of the scroll wheel’s movement. The initial value of this parameter is 1. When its value is set to 0, it supports the actions defined in menu (.mnu) files ； When its value is set to 1, panning is supported when the button or slider is held and dragged. What are the specific settings for 35 file security protection? (1) Right-click on an empty area in the CAD workspace; a shortcut menu will appear. Select the [Options] command, and the [Options] dialog box will be displayed. Click on the [Open and Save] tab. (2) Click the \"Security Options\" button on the \"Open and Save\" tab to open the \"Security Options\" dialog box; users can enter a password in the text field to set it, and a password prompt will appear when the file is opened again. If you forget the password file, it can never be opened again; therefore, it’s best to back up the file before encrypting it. 36 What are the functions of the various mouse buttons in AutoCAD? Left click: Select function key (select pixel, select point, select function). Right-click: Right-clicking in the drawing area brings up a shortcut menu or functions. (1) The variable SHORTCUTMENU is equal to 0——. (2) The variable SHORTCUTMENU is greater than 0 – Shortcut menu. (3) Environment options – Shortcut menu toggle; middle scroll wheel: 1. Rotate the wheel forward or backward to zoom in and out in real time. 2. Keep pressing the wheel and drag to pan in real time. 3. Double-click ZOOM to zoom in. 37 How to create non-orthogonal 90-degree axes? For non-orthogonal 90-degree axes, it is possible to use the 【Rotate】 command to rotate orthogonal lines by an angle in order to create an arc-shaped oblique axis grid, or the 【Construction Line】 command can be used to draw diagonal lines. 38. How to reduce file size? After the graphic is completed, use the PURGE command to remove unnecessary data such as unused blocks, layers without entities, as well as unused line styles, fonts, and dimension styles. This can effectively reduce the file size. Generally, thorough cleaning requires PURGING two to three times. Additionally, by default, writing to R14 is done in append mode, which is faster. If disk space needs to be freed, the ISAVEPERCENT system variable must be set to 0 to disable this incremental saving feature, so that the file size is reduced upon the second save. 39 How to shrink graphic files? Graphic files created or edited using AutoCAD contain not only the graphic objects that have been drawn, but also non-graphic objects that are invisible on the screen. Non-graphical objects are also known as named objects, and their purpose is to manage the various objects within a graphic. During the drawing and editing of graphics, for certain reasons, some unnecessary named objects may accumulate within the graphics. For example, blocks that are no longer in use, text styles, or layers that contain no graphic objects, and so on. Since these unnecessary named objects also take up disk space, the files become larger, which slows down AutoCAD’s speed when editing those graphic files. Therefore, it is necessary to remove some unnecessary named objects from the graphic. The operation method is as follows: (1) Enter the command PURGE directly, then press the space bar or Enter key to bring up the [Clear] dialog box. (2) Click the [Clear All] tool button. If the [Clear All] button remains available after one cleanup, continue clicking it until it becomes unavailable. (3) Click the [Close] button to close the dialog box. (4) Save the graphic file and exit AutoCAD. Readers should note that cleaning up named objects allows for the removal of individual named objects, all styles and definitions of a specific type, all named objects in a graphic, etc., but it is not possible to remove named objects that are referenced by other objects. 40 Methods of inserting EXCEL tables in AUTOCAD. Copy the content from EXCEL, then go to EDIT in CAD, use PASTE SPECIAL, select AutoCAD entities, confirm, choose the insertion point, and expand them after insertion. 41 Methods of inserting AutoCAD graphics into Word documents. You can first copy the AutoCAD drawing to the clipboard, and then paste it into a Word document. It should be noted that since the default background color in AutoCAD is black, while it is white in Word, the background color of the AutoCAD drawing must first be changed to white (Tools-Options-Display-Colors). Additionally, when AutoCAD drawings are inserted into Word documents, the empty edges are often too large, resulting in an unsatisfactory appearance; this issue can be resolved by using the crop function on Word’s picture toolbar. It can be solved then. 42. When inserting graphics from AutoCAD into WORD, sometimes circles turn into regular polygons – what should be done? Use the VIEWRES command to set it to a larger value, which can change the graphics quality. 43 The line width issue when inserting drawings from AutoCAD into WORD. When a thin line is needed, use a line width of 0.25 or less ； When a thicker line is needed, set the line width to more than 0.25 (lines with a width greater than 0.25 will have a printed width of over 0.5 mm in Word). Note: Line width display must be activated in CAD. If the image was edited by double-clicking it in Word, please check again to ensure that line width is activated. When the desired line width is between 0.25 and 0.5, use a polyline to set the width. 4444. The lines in AutoCAD drawings pasted into a Word document come out too thin when printed – what should I do? Pasting AutoCAD drawings into an MS Word document seems to work fairly well. But when the document is printed, those AutoCAD graphic lines become very thin, resulting in a poor appearance. We provide users with the following solutions: (1) Use the PostScript printing driver in AutoCAD to configure a PostScript printer. (2) If the background color of AutoCAD is different from the background color of MS Word. (3) Run the PLOT command and select “plot to file”. Set the brush width in the Brush Settings dialog box. (4) Start a new diagram and import this.eps file using the PSIN command. (5) Then cut and paste the graphic into MS Word. There is another method: in AutoCAD, convert the lines into PLINE lines, set the width, and then copy and paste them into WORD. 45 What should I do if there is no dashed box displayed when drawing? Modify the system variable DRAGMODE; it is recommended to set it to AUTO. When the system variable is set to ON, after selecting the object to be dragged, the outline of the object is displayed only when DRAG is entered in the command line during dragging ； When the system variable is set to OFF, the object’s outline is not displayed when dragging ； When the system variable is set to AUTO, the object’s outline is always displayed when dragging. 46 What should I do if the dashed box that appears when dragging the mouse to select an object turns into a solid box, and two intersecting points remain after selection? Simply change the system variable BLIPMODE to OFF. The issue with 47 files not being able to be exploded or processed using other common commands? This is caused by a Lisp program that spreads widely over local networks, rendering several commonly used commands unusable; block expansion can only be done using XP commands. There are two ways to solve this issue. One is to delete the acad.lsp and acadapp.lsp files; both should be 3K in size. Then, copy acadr14.lsp twice and name them with those two file names, setting them as read-only – this will prevent the problem. You need to delete all lsp files in the directory where your DWG file is located. Otherwise, you will infect others. Second, there is software specifically designed to eliminate this virus. 48 How to interrupt an object at a specific point using the break command? Execute the break command; when prompted to enter the second point, you can type @ and then press Enter, thereby interrupting the selection at the first point. 49 How to remove a element that was selected accidentally when using editing commands? Hold down the Shift key while the command is still active to select multiple elements. 50【! Usage of the ] key: Suppose there is a line on the screen with a known length (it can be a single line or a multi-segment line; an unknown length is also possible), and it makes an angle with the horizontal direction. If we want to shorten this line by a certain amount while keeping its direction unchanged, the procedure is as follows: First, select the line so that its endpoints become visible. Move the cursor to one of the ends that needs to be shortened and activate that endpoint, thereby turning the line into a stretchable ‘rubber band’-like element. Move the cursor in the direction of the line until the rubber band aligns with the original line segment. There is no limit on the distance of movement. If someone thinks that the movement direction should not be the same as the original one, they can use the ‘Snap to Nearest Point’ command; enter [Snap to Nearest Point] and then, after the prompt “Near to”, enter [!XX] (where XX is the specific value) and press Enter. This will change the length of the line. 51 Methods for querying quality attributes? AutoCAD provides functions for querying point coordinates (ID), distance, and area, which greatly facilitates the analysis of graphics. However, in practical work, it is sometimes necessary to query the mass properties of entities. AutoCAD offers the option to query mass properties, allowing for easy determination of an entity’s moment of inertia, polar moment of inertia, and center of mass. It should be noted that for closed areas created using curves or polylines, it is first necessary to use the region command to convert those areas into proper geometric entities before performing mass property queries, in order to obtain information such as the moment of inertia, polar moment of inertia, and center of mass of the entity. 52 How to calculate the area of a 2D shape? (1) For simple shapes, such as rectangles and triangles. Simply execute the AREA command (which can be entered via the command line or by clicking the corresponding command icon). After the command prompt shows \"Specify first corner point or :\\", activate snap mode, select the intersection points of the rectangle or triangle one by one, then press Enter. AutoCAD will automatically calculate the area and perimeter, and display the results on the command line. (2) For simple shapes, such as circles or other two-dimensional closed shapes composed of polylines or splines. Execute the AREA command; after the prompt [Specify first corner point or :], select the Object option, and choose the shape for which you want to calculate the values. AutoCAD will then automatically calculate the area and perimeter. (3) For complex closed shapes composed of simple straight lines and arcs, the AREA command cannot be used directly to calculate the area of the shape. First, use the REGION command to create the shape for which you want to calculate the area as a boundary region, and then execute the AREA command. After the command prompt shows \"Specify first corner point or :\\", select the Object option and choose the boundary region that was just created; AutoCAD will then automatically calculate the area and perimeter. 53 How to set the line width? There are many ways to change the line width of AutoCAD objects. The most common method is to use the color of the entities on the graphical screen to obtain different line widths for the output lines. In other words, when drawing, different types of shapes are colored differently according to one’s needs. Then set different line widths and colors for the printed output. The method is as follows: Click the [File] menu and select [Print], or press [Ctrl+P]; a [Print/Plot Configuration] dialog box will then appear. In [Pen Parameters], click [Pen Assignment]. The [Pen Assignment] dialog box appears, where you can specify the pen number for each color code and choose an appropriate pen width. First, let me explain to you how the pen width is determined. The pen width is primarily determined by the resolution of the printing device and the distance between the print dots, as given by the formula /. AutoCAD will use these standard values to replace the values we enter arbitrarily. 54 Regarding the issue of line width: LineWeight represents an absolute line width, whereas the line width of polylines is relative. In other words, no matter what size the graphic is printed at, the LineWeight remains unchanged; however, the line width of polylines changes depending on the printing scale. No matter how much a solid is scaled, its LineWeight stays the same, but the line width of polylines changes with the scaling factor. The clever use of 55 keys in AutoCAD’s snap function? When it is necessary to capture a point on an object, simply bring the mouse close to that object, and keep pressing the TAb key. Then, certain specific points on that object (such as the endpoints of lines, midpoint, perpendicular points, intersection points with the object, quarter points of circles, center point, tangent points, perpendicular points, and intersection points) will be displayed in turn. Click with the left button on the desired point to capture it. Note that when the mouse is brought near the intersection point of two objects, their special points will be displayed in turn, and the objects to which they belong will turn into dashed lines; this is very useful for locating points in areas where the geometry is relatively complex. Are the ellipses generated by the 56 ellipse command polylines or solids? It is determined by the system variable PELLIPSE; when it is 1, the ellipse generated is a multiline. 57 How to draw curves? When drawing patterns, it is common to encounter problems such as drawing intersection lines, intersection curves, and other types of curves. Manual drawing is troublesome; it requires finding special points and a certain number of ordinary points, and the curves drawn can have large errors. It is easy to draw planar curves or spatial curves using AutoCAD 2000. Method 1: Use the Pline command to draw a polyline on a 2D graph that passes through specific points; by fitting it with a Fit or Spline curve using the Pedit command, it can be transformed into a smooth planar curve. Using the 3Dpoly command to draw polyline paths on 3D shapes that pass through specific points, and then fitting them with spline curves via the Pedit command, can result in smooth spatial curves. Method 2: Use the Solids command to create basic 3D solids (cubes, cylinders, cones, spheres, etc.), and then apply Boolean combination operations such as intersection, union, difference, and interference to obtain various complex solids. Next, use the View/3DViewpoint dropdown menu to select different viewpoints in order to generate standard views and obtain various projection views of the curves. 58 Why did the deleted lines reappear? The most likely explanation is that several lines overlap each other. This is a common problem for beginners. Also, when a center line or dashed line remains a continuous line regardless of how the line width ratio is changed (after REGEN), this is usually the reason as well. 59. How can the trim command be used to trim multiple line segments at once? For example, line AB intersects four parallel lines; now, the part to the right of line AB needs to be removed. To do this, use the trim command, select AB when prompted to choose an object, then press Enter. Next, enter F and press Enter, and finally draw a line to the right of AB and press Enter. Width issue of polylines: When the width of a polyline is set to a value other than 0, it will be printed at that specified width. If the width of this polyline is too small, no width effect will be produced. (If drawing in millimeters, set the polyline width to 10; when printing at a 1:100 scale, this corresponds to 0.1 millimeters.) ) Therefore, the width setting of polylines must take the printing scale into account. When the width is 0, it can be set according to the object’s properties (just like other objects). 61 How to merge multiple lines into one? This can be done using the Group command. 62 How to merge multiple lines into a polyline? Use the PEDIT command, which has a merge option. 63 How to use the middle button of the mouse? (1) Ctrl+ middle mouse button can achieve panning similar to other software. (2) Double-clicking the middle mouse button is equivalent to ZOOM/E. 64. Direction issues when breaking circles? AutoCAD will delete the arc on the circle between the first break point and the second break point in a counterclockwise direction. 65 How to quickly draw tangent semicircles to parallel lines? Using the FILLET command with rounded corners is 10 times faster than first drawing tangent circles and then cutting them. 66 How to quickly enter a distance? Following the prompt at the positioning point, enter a numerical value to position the next point at a specified distance in the direction indicated by the cursor. This function is typically used when the [Orthogonal] or [Snap] mode is active. For example: Execute command: line ； Specify the first point: Specify the point ； Specify the next point: Move the cursor in the desired direction, enter 5, and press Enter. 67 How to restore smoothness to a rough graphic? Sometimes, after scaling or zooming a graphic, it becomes rough – for example, a circle turns into a polygon – and the regen command can be used to restore its smooth appearance. What should I do if the copied graphics are always placed far apart after pasting? Use base-point copying when using the copy command. 69 How to measure the length of multi-segments with arcs? What are the tips for using the list command and the 70 rotation command? Objects can be rotated by dragging the mouse. After selecting an object and specifying a base point, a line will appear from the base point to the current cursor position; moving the mouse will cause the selected object to rotate dynamically as the angle between this line and the horizontal direction changes, and pressing Enter will confirm the rotation. 71 Why is there no change when the round corner and bevel commands are executed or not? This is because the system defaults the corner radius and bevel distance to 0; if the corner radius or bevel distance is not set in advance, the system executes the command using these default values, which gives the impression that no command was executed. Tips for using the 72 Grid tool? When entering values in the [Grid X-axis spacing] and [Grid Y-axis spacing] text boxes, if a value is entered in the [Grid X-axis spacing] box and Enter is pressed, AutoCAD automatically transfers this value to [Grid Y-axis spacing], thereby reducing the amount of work required. 73 Why is it necessary to lock a position within a block sometimes? In dynamic blocks, since the location of attributes is included in the action selection set, they must be locked. Tips for working with 74 mapping scales? To obtain drawings at a specific scale, the usual approach in drawing is to first insert a standard drawing frame at a 1:1 scale, and then use the 【SCALE】 button. By taking advantage of the numerical relationship between the drawing elements and the frame, the frame is scaled by the reciprocal of the desired scale, thereby allowing the creation of a 1:1 drawing without the need to scale the actual graphics. This method is commonly used in practical engineering drawing; if scaling the graphics is employed, it often affects the dimensions indicated on the drawing. Each company has frames in different sizes. When creating such frames, they are usually drawn at a 1:1 scale for A0, A1, A2, A3, and A4 sizes. Among them, vertical frames are also often used for sheets A1 and A2. Additionally, if an extended frame is needed, it should be increased in the direction of the frame’s longer side by multiples of 1/4 of that side’s length. Enlarge the picture frames of different sizes to the desired scale, and then use the frames to \"enclose\" the design. 75 Linear operation tips? By globally modifying or individually adjusting the line style scale factor for each object, the same line style can be used at different scales. By default, both the global line style and the individual line style scale are set to 1.0. The smaller the ratio, the more repeating patterns are generated per drawing unit. For example, when set to 0.5, each graphic unit displays the same pattern twice in the linear definition. Short line segments that cannot display the full line pattern appear as continuous lines. For line segments that are too short to even display a small dashed segment, a smaller line style scale can be used. 76 What are the tips for using the [Line] command? If it are orthogonal lines, you can click the [Orthogonal] button; following the instructions regarding the orthogonal direction, you can simply enter the distance to the next point, without needing to use the @ symbol ； If it is a slant line, you can click the [Polar Axis] button or right-click on it; a window will appear allowing you to set the capture angle for slant lines. At this point, the graphics will enter a mode where automatic capture of the desired angle is enabled, which **improves the efficiency of entering straight-line lengths during drawing. At the same time, right-click on the [Object Snap] switch; in the menu that appears, select the [Settings] command. This will bring up the [Sketch Settings] dialog box, where you can configure object snap settings. When drawing, simply press the [Object Snap] button, and the program will automatically capture certain points such as endpoints, midpoints, circle tangents, and more. The use of the [Snap to Objects] function can significantly increase drawing speed. Object snapping can be used to specify an exact position on an object; for example, it can be used to draw lines to the center of a circle or the midpoint of a polyline. If a command prompts you to enter a point (such as a starting point, center point, or reference point), object snap can be specified. By default, markers and toolbar prompts are displayed when the cursor is moved to an object’s snap location. This feature is called AutoSnap; it provides visual cues indicating which object snaps are in use. 77 Ways to quickly modify text? Simply double-click on the text (command: ddedit), and a flashing text editor will appear (similar to WORD); in this mode, the user can enter new text. Operating tips for the 78 Design Center? Through the Design Center, users can organize access to graphics, blocks, hatches, and other graphic content. Any content from the source graphic can be dragged into the current graphic. Graphics, blocks, and fills can be dragged to the tool palette. The source graphic can be located on the user’s computer, a network location, or a website. Additionally, if multiple drawings are open, it is possible to simplify the drawing process by using the Design Center to copy and paste other elements between them (such as layer definitions, layouts, and text styles). AUTOCAD drafters must make good use of the advantages of the Design Center. What should be noted regarding the 79 scaling command? The SCALE command can enlarge or reduce the actual size of the selected object according to a specified scale factor. After executing it, enter the [r] parameter to enter reference mode, and then specify the reference length and the new length. The reference pattern is applicable when the scale factor is not entered directly or is unclear. What is the purpose of 80 yuan? Users can create the drawn legends as blocks, that is, save the legends in block form and organize them in separate folders. When they need to use these legends for drawing again, they simply need to insert those blocks; moreover, it is also possible to assign attributes to the blocks. The use of blocks can **improve drawing efficiency. 81 How to easily modify a pattern? Beginners must first learn to use layers flexibly. With proper layer classification, it is easy to modify patterns; when altering one layer, the other layers can be turned off. Set the layers to different colors so you won’t draw on the wrong layer. Use freezing and turning off layers flexibly. What should be noted when using block 82? (1) Inheritance of object layers composed of graphic blocks ； (2) Inheritance of object color, line type, and line width by graphic blocks ； (3) The meaning of bylaer and byblock, that is, the meaning of per-layer and per-block ； (4) Use of layer 0. AUTOCAD provides the [Dynamic Block Editor]. The block editor is a writing area specifically used to create block definitions and add dynamic behavior. The block editor provides a dedicated writing palette. These palettes allow for quick access to the block creation tools. In addition to the block writing palette, the block editor also provides a drawing area where users can draw and edit geometric shapes in the program’s main drawing area as needed. Users can specify the background color of the drawing area in the block editor. 83 What is the difference between internal blocks and external blocks? An internal block is a block defined within a file, and it can be used freely within that file. Once defined, an internal block is stored and opened along with the file. External blocks write the [block] to disk in the form of a main file, and other graphic files can also use it; it is important to note that this is a key difference between external blocks and internal blocks. 84 Tips for working with pattern fills? When using the [Pattern Fill] command, the scale factor value of the pattern used is always 1; in other words, it is the original style as defined. However, as the definition of the boundaries changes, the scale factor should be adjusted accordingly; otherwise, the pattern may become too dense or too sparse. Therefore, the following techniques can be used when selecting the scale factor: (1) When working with patterns in smaller areas, the scale factor value can be reduced, whereas when filling patterns in larger areas, the scale factor value can be increased. (2) The scale factor should be chosen appropriately, and this choice depends on the size of the specific graphic boundaries. (3) When working with larger filling areas, special care is required. If the pattern scale factor chosen is too small, the resulting pattern will be similar to the filling effect obtained using the Solid command; this is because there are too many lines per unit distance, which not only makes it unattractive visually but also increases the size of the file. (4) The value of the scaling factor should follow the principle of \"preferably larger rather than smaller\". What do the 0 and 1 that sometimes appear in AUTOCAD mean? (1) The system command mirrtext controls the way in which the MIRROR command displays text. The initial value is 0, where: 0 – maintains the original text direction; 1 – displays the text in a mirrored format. (2) The system command textfill controls the way TrueType fonts are filled during printing and rendering. The initial value is 0, where: 0 – the text is displayed in outline form; 1 – the text is displayed as a filled image. What are the tips for using the Offset command? An object can be shifted by a specified distance in a certain direction, thereby creating a new object that is identical to or similar to the original object. The elements that can be manipulated include lines, circles, arcs, polylines, ellipses, construction lines, spline curves, etc. (It’s similar to the [Copy] function.) When shifting a circle, it is also possible to create concentric circles. When offsetting a closed polyline, it is also possible to create a closed shape with the same form as the original object. It is evident that OFFSET is quite flexible in its use; therefore, the Offset command is undoubtedly one of the most frequently used commands among AutoCAD’s modification commands. When using Offset, users can create new line segments in two ways: one is by entering the distance between parallel lines, which is also the most commonly used method ； Another method is to specify the point through which the new parallel line should pass; by entering the prompt parameter [T], a certain point can be selected as the point through which the new parallel line will go. This way, when it’s not convenient to know the distance between the parallel lines, there is no need to enter that distance, and errors are less likely to occur (this can also be achieved by copying). 87 How to use the dynamic input function flexibly? The dynamic input feature provides a command interface near the cursor to help users focus on the drawing area. When Dynamic Input is enabled, toolbar prompts will display information near the cursor, which updates dynamically as the cursor moves. When a command is active, the toolbar prompt will indicate where the user should enter the input. Click the button on the status bar to turn the dynamic input feature on and off. The shortcut key F12 can also be used to turn it off. The dynamic input function consists of three components: pointer input, annotation input, and dynamic prompts. Right-click on the button, then click [Settings]. The [Dynamic Input] tab of the [Sketch Settings] dialog box will appear; by checking the relevant options, you can control what is displayed for each component when [Dynamic Input] is enabled. What are the tips for using the 88 mirror command? Mirrors are very useful for creating symmetric patterns; they allow one to quickly draw half of an object and then mirror it, without having to draw the entire object. By default, when text, attributes, and attribute definitions are mirrored, they are not reversed or inverted in the image resulting from the mirroring. The text alignment and justification remain consistent before and after the mirrored pattern. If text indeed needs to be reversed in the drawing, the MIRRTEXT system variable can be set to 1; the default value is 0. Editing techniques for polylines with over 89 segments? In addition to the standard editing operations used for most objects, polylines can be edited using the PEDIT command, as detailed below. (1) Closed. Create closed segments for the polyline to form a closed area, that is, connect the last segment to the first segment. By default, polylines are considered open. (2) Consolidation. You can add lines, arcs, or polylines to the endpoints of an open polyline, and remove curve fitting from a curve-fitted polyline to form a single polyline. To merge objects into a polyline, their endpoints must be continuous and gap-free. (3) Width. Specify a new uniform width for the polyline. Use the [Width] option in the [Edit Vertex] options to modify the width of the start and end points of the line segment. Used to edit line width. 90 How to solve the issue of not being able to find the range when filling with the 【HATCH】 pattern? When using the [HATCH] command for pattern filling, it is common to encounter situations where it’s not possible to identify the closed boundary of the area to be filled, especially when the file is quite large. In such cases, the [layiso] (layer isolation) command can be used to isolate or \"freeze\" the layer on which the boundaries of the area to be filled are located; this makes it easier to locate the desired area for filling using [HATCH]. Additionally, there’s an issue regarding the boundary settings for fill patterns (under the Advanced tab). By default, HATCH defines the boundaries by analyzing all closed objects in the drawing. Analyzing all fully or partially visible objects on the screen to define boundaries can take a significant amount of time in complex graphics. To fill small areas of complex shapes, an object set can be defined within the shape, known as a boundary set. HATCH will not analyze objects that are not included in the boundary set. 91 What should I do if I accidentally select an element that shouldn’t be selected when using copied objects? When using copied objects, it’s possible to accidentally select an element that shouldn’t be selected; in such cases, this accidental selection needs to be removed. To do this, enter ‘r’ (delete) under the \"Select Object\" prompt, and then use any selection option to remove the object from the selection set. If you use the [Delete] option and want to add the object back to the selection set, enter a (Add). Objects can also be removed from the current selection set by holding down the SHIFT key and clicking on the object selection again, or by holding down the SHIFT key and then clicking and dragging a window or making a cross-selection. Objects can be repeatedly added and removed within the selection set. This operation is extremely useful when modifying and editing primitives. What is the 92 feature matching function? Using the [Match Properties] (matchprop) function, some or all of the properties of one object can be copied to another object. Its menu execution path is: Modify → Feature Matching. The property types that can be copied include (but are not limited to): color, layer, line type, line weight scale, line width, print style, and 3D thickness. What is the difference between the 93【Edit】→【Copy】 command and the【Modify】→【Copy】 command? The [Edit] → [Copy] command is used for copying between two CAD files, while the [Modify] → [Copy] command is used for copying within a single CAD file. 94 Tips for using the trim command? When using the trim command, objects to be trimmed are usually selected one by one by clicking on them, which can be inefficient. To speed up the trimming process, you can follow this approach: execute the trim command [TR] or [TRIM]. When the command line prompts \"Select objects to trim\", do not select any objects; instead, keep pressing Enter or clicking the spacebar, and the system will default to selecting all objects. 95 Ways to Draw Arrows: One method involves filling a polygon, another uses rectangles for decomposition; there is also a simple way to draw solid arrows – by using the PLINE command and setting the width of one end of the line to 0 while setting the width of the other end to a fixed value, which allows arrows to be drawn as well. What is the purpose of 96 object capture? When drawing, you can use the new object snap modifier to find the midpoint between any two points. For example, when drawing a line, you can hold down the SHIFT key and click the right mouse button to display the Object Snap shortcut menu. After clicking [Midpoint between Two Points], specify two points in the graphic. This line will start at the midpoint between these two points. 97 How to enter arc alignment for text? In practical work, it is sometimes necessary to perform special processing on text, such as aligning text along an arc, meaning that the text entered is distributed evenly along a specified arc. The steps are as follows: (1) Install AutoCADExpress Tools. (2) Draw an arc shape. (3) Enter the command ARCTEXT and press the Spacebar or Enter key. (4) Click on the arc, and the [ArcAlignedTextWorkshop-Create] dialog box will appear. (5) In the dialog box, set the font style and the offset distance from the arc; then enter the text that is to be arranged along the arc in the Text field, and finally click the [OK] button. 98 How to delete stubborn layers? Method 1: Turn off the unnecessary layers, select everything, COPY and PASTE it into a new file; those unnecessary layers will not be included in the new file. If a block was once defined in this unnecessary layer and then inserted into another layer, this unnecessary layer cannot be deleted using this method. Method 2: Select the graphics you want to keep, then choose File menu -> Export -> Block File. The resulting block file will contain the selected graphics; if there are no specific layers among these graphics, those layers will not be saved in the new block file. Method 3: Open a CAD file, first disable the layers that you want to delete, so that only the visible elements you need remain on the drawing. Click on File – Save As, enter a filename, select *.DXF as the file type. In the dialog box that appears, click on Tools – Options – DXF Options, check the box next to \"Select objects\", then click OK. Next, click Save to choose which objects to save; select the visible or desired elements and confirm the save. Once done, exit the file that has just been saved, then open it again – you will find that the layers you didn’t want are no longer there. Method 4: Use the laytrans command to map the layer to be deleted to layer 0; this method can be used to delete layers that contain solid objects or are defined within other blocks. What is the use of 99 layers? Making rational use of layers can achieve twice the result with half the effort. When starting to draw, some basic layers are set up in advance. Each layer has its own specific purpose, and the advantage of this is that by creating just one graphic file, it is possible to generate many of the required drawings; modifications can also be made specifically to each layer. How to quickly switch layers in 100? Select any element in the layer you want to transform, then click \"Make the object’s layer current\" on the layer toolbar.