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For beginners in CAD drawing, the most frustrating thing is that after going through so much trouble to install the CAD software, they encounter various problems when actually using it for design and drawing. There are no introductory tutorials for CAD drawing, a lack of guidance from experienced CAD users, and extremely scarce resources for CAD drawings – making it very difficult for newcomers to CAD to progress in their skills! Without further ado, here is a carefully prepared CAD tutorial – no prior knowledge of CAD is required! 1. What should I do if an abnormal error occurs when trying to open an old image, causing the process to terminate? Open HaoChen CAD to create a new drawing file, and then insert the old drawing as a block. 2. What should I do if the toolbar is missing in HaoChen CAD? Select the [Tools] menu, Options, the [Configuration] tab, and the [Reset] button ； You can also use the MENULOAD command, then click Browse and select GCAD to load it. 3. 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) You can also use the command ISAVEBAK to set the system variable ISAVEBAK to 0; when this system variable is set to 1, a [*BAK] backup file is created every time something is saved. 4. What should I do if the dialog box in CAD commands turns into the command prompt line? Enter CMDDIA in the command prompt, and the system variable will be changed to 1. When the system variable is 0, it is the command line ； When the system variable is 1, it is a dialog box. 5. How to make a graphic view-only and not editable? Lock all layers; they won’t change 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. 6. What scale is best for drawing in HaoChen CAD? It is best to draw at a 1:1 ratio; the output ratio can be adjusted as desired. The drawing scale and the output scale are two different concepts; when exporting, 1 unit of output corresponds to 500 units in the drawing, which means the output is done at a scale of 1/500 ； If 10 units of output equal 1 unit in the drawing, it means the output is enlarged by a factor of 10. 7. What should I do if files take up a lot of space and slow down my computer’s performance? Graphic files grow in size after being modified multiple times, especially after multiple blocks are inserted. At this point, the computer’s operating speed will also slow down, as will the speed of graphic processing. 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.; as a result, the size of the graphic file will also decrease ； Or enter purge in the command line. 8. The clever use of the 【Tab】 key in HaoChen CAD’s snapping function: When it is necessary to snap to a point on an object, simply bring the mouse close to that object and keep pressing the 【Tab】 key. Then, various specific points on the object (such as the endpoints, midpoint, perpendicular points of lines, intersection points with the object, the quartic points, center point, tangent points, and intersection points of circles) will be displayed in turn. Select the desired points and left-click to capture them. 9. How to measure the length of multi-segments with arcs? Using the list command (list): 10. How to quickly switch layers? Select any element in the layer you want to transform, then click \"Make the object’s layer current\" on the layer toolbar. Have you learned all these common tips for getting started with CAD drawing? Haocheng CAD helps you draw diagrams quickly – no prior CAD experience needed!