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Friends who are just beginning to get involved in AutoCAD 3D modeling can start with the following steps: 1. Start practicing with basic geometry (such as cubes, cylinders, spheres), use commands such as BOX, CYLINDER, SPHERE and other commands to build simple models and combine them into complex structures; 2. Master Boolean operations (UNION merge, SUBTRACT cutting, INTERSECT intersection) to create solid models with holes or combined structures; 3. Pay attention to the view and coordinate system (UCS) settings, switch the view angle to understand the structure, and ensure the correct operation direction by adjusting UCS; 4. After completing the modeling, it can be exported to STL, STEP or IGES format for easy printing or sharing, and use SECTIONPLANES to view internal structures or use tools such as Fusion 360 to view. AutoCAD 3D modeling will become clear and efficient as long as you master these core techniques step by step.
Friends who are just beginning to get involved in AutoCAD 3D modeling may feel that the interface is complex and the commands are numerous, and they don’t know where to start. In fact, as long as you master the basic processes and common tools, the modeling process can become clear and efficient.

Start practicing with basic geometry
AutoCAD's 3D modeling does not require complex parts or building structures from the beginning. It is recommended to start practicing with the most basic geometry, such as cubes, cylinders, spheres, etc. These basic shapes are the basis for building more complex models.

- Use the
BOX
command to quickly create a rectangle -
CYLINDER
can be used to make shaft parts or holes - If you want to make rounded corners or transitions, you can use
SPHERE
orTORUS
Pay attention to switching the view direction during operation, such as using the "isometric" viewing angle (isometric), which can better observe the three-dimensional structure. Beginners can try to combine several basic bodies, such as making a cup with handles to train their understanding of the spatial structure.
Learn to combine models with boolean operations
During the modeling process, you often encounter situations where multiple objects need to be merged, cut or intersection, and at this time, you need to use Boolean operations:

-
UNION
: Combine two or more entities into one -
SUBTRACT
: Subtract another object from one object, often used for hole punching -
INTERSECT
: Keep the overlapping parts of two objects
For example, if you want to make a metal plate with holes, you can first draw a rectangle, then draw a cylinder as the position of the hole, and then use SUBTRACT
to "dig" the cylinder from the rectangle.
The key to this step is to make sure that the objects participating in the operation are "solids", not surfaces or wireframe models, otherwise an error will be prompted.
Don't ignore the settings of the view and coordinate system
Many novices tend to ignore the adjustment of view and coordinate system (UCS) when modeling, which results in low modeling efficiency and even wrong directions.
- Frequent switching of view angles (such as top view, front view, left view, isometric) helps to understand the model structure
- Use the
VIEW
command to save common view angles - When drawing on different surfaces, remember to adjust the UCS so that stretching, rotation and other operations will be performed in the direction you want
For example, if you are making a raised structure on a slope, if you do not adjust the UCS, the modeling direction will be incorrect. At this time, you can use UCS
command to select the "Object" option to make the coordinate system fit the slope, making the operation much more convenient.
Export and viewing tips
After modeling is completed, you may need to export as STL files for printing, or send them to someone else to view. AutoCAD supports exporting in multiple formats:
- Export STL for 3D printing, note that the unit should be uniform (mm or inches)
- If others do not have AutoCAD, they can export it to
.STEP
or.IGES
format, which is more versatile - Use the
SECTIONPLANES
tool to generate sectional views, which facilitates the display of internal structure
In addition, if you just want to simply view the model, you can use Autodesk's own free software, such as Fusion 360 or AutoCAD Web version, which can be viewed without installing the full version.
Basically all that is it. AutoCAD 3D modeling looks complicated, but as long as you take it step by step and master the basic operations and logic, you will be able to get started slowly.
The above is the detailed content of AutoCAD 3D modeling tutorial. For more information, please follow other related articles on the PHP Chinese website!

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