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Hello. 
I am just learning AutoCAD 2016 by myself and of course it has a lot of dificulties.

As one of them, I wonder how to make lines into a complete boundary(of course it is closed).
I usually use 'Extrude' to make solid, because the working piece has simple structure(several cylinders, so all I need to do was just extrude a circle.)

But when I define a boundary by drawing several lines and extrude it, that doesn't give a solid but a surface made by each line(thus they are just boundary surfaces).
I have to make a pillar with such boundary but don't know how to do.
I tried to make a group with that lines but extrude still doesn't give me a pillar.

Anyone have similar experiences before?

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johnthelegend Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 13.Jan.2016 Location: Korea, South Using: AutoCAD 2016 Status: Offline Points: 2	Topic: From lines to boundary Posted: 13.Jan.2016 at 08:16
	Hello. I am just learning AutoCAD 2016 by myself and of course it has a lot of dificulties. As one of them, I wonder how to make lines into a complete boundary(of course it is closed). I usually use 'Extrude' to make solid, because the working piece has simple structure(several cylinders, so all I need to do was just extrude a circle.) But when I define a boundary by drawing several lines and extrude it, that doesn't give a solid but a surface made by each line(thus they are just boundary surfaces). I have to make a pillar with such boundary but don't know how to do. I tried to make a group with that lines but extrude still doesn't give me a pillar. Anyone have similar experiences before?

John Connor Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 01.Feb.2011 Location: United States Using: AutoCAD 2018 Status: Offline Points: 7175	Posted: 13.Jan.2016 at 11:23
	Try using the PressPull command. You can also try creating a region first from your groups of lines, etc. then extrude. I am a bit confused though. First you mention trying to extrude a circle then you say you had a bunch of lines that you extruded by ended up with surfaces. Finally you talk about creating a pillar. I'm not really sure what it is you are trying to do. Can you post an image or upload an actual .dwg file? If one extrudes a circle they should end up with a closed cylinder. This could be used to create a pillar (an ornamental column). Then one would add the base and top cap. Is the pillar going to be tapered? Edited by John Connor - 13.Jan.2016 at 11:27
	"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>

John Connor Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 01.Feb.2011 Location: United States Using: AutoCAD 2018 Status: Offline Points: 7175	Posted: 13.Jan.2016 at 12:41
	A simple 3D pillar created using solids. >
	"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>

Kent Cooper Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 12.Mar.2013 Location: United States Using: AutoCAD2020, 2023 Status: Offline Points: 686	Posted: 13.Jan.2016 at 17:01
	To make a closed boundary of Lines into a single object so that when it's Extruded you get a 3D Solid, use the PEDIT command and its Join option, to make the Lines into a closed Polyline. [If it's not clear enough what to do from the prompts, read about it in Help.]

John Connor Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 01.Feb.2011 Location: United States Using: AutoCAD 2018 Status: Offline Points: 7175	Posted: 13.Jan.2016 at 17:58
	Try using PressPull first as it will work even if the "boundary" is comprised of a couple of lines, a polyline, an arc and a spline. The result will still be a 3Dsolid.
	"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>

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From lines to boundary

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