Autocad 3d Mechanical Drawing - [better] -

Here is a realistic modeled entirely in AutoCAD 3D .

Every starts with a sketch. This is usually a closed polyline drawn on the XY plane (the "World" UCS). For mechanical parts, accuracy is paramount. You must utilize Object Snaps (OSNAP) to ensure lines meet perfectly at corners and tangent points. If your 2D profile has gaps, your 3D model will fail to generate correctly. Autocad 3d Mechanical Drawing -

Key advantages include:

The unique strength of AutoCAD lies in its familiar interface. Most engineers are comfortable with the 2D environment, and AutoCAD leverages this by allowing users to build 3D geometry directly from 2D profiles. Here is a realistic modeled entirely in AutoCAD 3D