Rotate a line drawing to create a solid

[bencharlton5C8EZ]

Hi folks

3D numpty here but I routinely find myself banging my head against a problem whereby I've drawn a shape using lines, polylines, arcs etc and I want to rotate it for form a solid.  The problem is that it either wont let me or I end up with a surface rather than a solid.  I try join and or pedit but this some times helps some times doesn't.  I have attached an example which is half the section of a column I want to rotate by 360 degrees to create the solid.

Thanks

[bencharlton5C8EZ]

The really stupid thing is sometimes I seem to do it and it works fine so I dont know what I am doing wrong.

[will_young]

Have you tried REVOLVE? 

[bencharlton5C8EZ]

Yes, that is the command I am using, sometimes it works for me fine but other times, as in the file I attached for example, it uses the lines to make a surface rather than a solid (or doesn't work at all).

I must be doing / not doing something with the lines.  I try join and pedit/join as I said which sometimes solves the problem but hasn't in this case.

[will_young]

I think it's based on the mode chosen in the command: AutoCAD 2025 Help | About Creating a Solid or Surface by Revolving | Autodesk

Also whether it's open or closed will affect it:

Open curves always create surfaces, but closed curves can create either solids or surfaces depending on certain settings.

AutoCAD 2025 Help | About Constructing Solids and Surfaces From 2D Geometry | Autodesk

[bencharlton5C8EZ]

did you take a look at the file I shared?

[tramber]

The polyline is open.

A good knowledge of their editing is required for 3D...

But we are not far, are we ?

[tramber · Accepted solution]

Get very close and suppres this vertex

Then close the polyline with PEDIT or the properties palette.

That would be my way of fixing.

[bencharlton5C8EZ]

That's got it, thank you!

[will_young]

Yes, did you read the link? 😋