Sometimes you need to create a 2D profile that is a combination of the basic geometrical shapes that AutoCAD creates. While you might be able to use the PLINE command to create what you want, an easier way might be to combine or subtract simpler shapes.
For example, let’s say that you want to create this profile.
Depending on the information you have about the radius of the circle and length of its inset, it might be easier for you to start with these objects:
Here is one way to get the result you want:
- Draw the large filleted rectangle, the 2 small rectangles and the circle.
- Start the REGION command. (You can find it on the ribbon in the 2D Drafting & Annotation workspace. On the Home tab, expand the Draw panel by clicking its down arrow and choose Region.)
- Select all 4 objects and end selection. You’ll see a message: 4 loops extracted. 4 Regions created.
- Start the SUBTRACT command. This command isn’t on the ribbon in the 2D Drafting & Annotation workspace, so just type the command on the Command line.
- At the Select solids, surfaces, and regions to subtract from .. Select objects: prompt, select only the larger filleted rectangle and end selection.
- At the Select solids, surfaces, and regions to subtract .. Select objects: prompt, select the 2 small rectangles and the circle. Then end selection.
AutoCAD subtracts the smaller regions from the larger one, leaving just the desired profile.
Combine shapes with the UNION and INTERSECT commands
You can also use the UNION command to turn the 4 regions on the left to the region on the right.
Finally, you can use the INTERSECT command to find the intersection of 2 regions, as you see here.
Do you use regions in 2D drawings, to combine/subtract them or for some other purpose? Leave a comment!