topic Re: How to create a curved pipe/cylinder in AutoCAD Forum

How to create a curved pipe/cylinder

lbellino4 — Fri, 11 Aug 2017 15:48:21 GMT

Hello.

I'm trying to create a pipe to fit in the area shown on the left in the image provided. If it do just a arc, it will sweep, but not end up directly on each end of the existing pipes that it should go to, to fit in this area evenly. So I tried creating poly lines with an arc joined, as shown, but it won't let me sweep. What command(s) should I be using here to create a corner pipe that will fit nicely in this area that I need it to fit in? Or what am I doing wrong? Thanks.

Re: How to create a curved pipe/cylinder

JDMather — Fri, 11 Aug 2017 16:16:55 GMT

Sweep will (should) work, but from you image you appear to be missing tangency in the path.

Attach the *.dwg file here and end all doubt.

Re: How to create a curved pipe/cylinder

dbroad — Fri, 11 Aug 2017 16:49:52 GMT

Looks like a very sharp radius at the path. Is that radius at least as large as the pipe radius? It probably should be bigger but if it is smaller than the pipe radius it won't work. Also the two pipes are not offset from the apparent intersection equally.

Re: How to create a curved pipe/cylinder

lbellino4 — Fri, 11 Aug 2017 16:50:10 GMT

Attached is the drawing file and if I'm missing a tangency, is there an easy way to find where it's missing?

Re: How to create a curved pipe/cylinder

lbellino4 — Fri, 11 Aug 2017 16:54:09 GMT

Unfortunately, this is the space I have and need to create a pipe for and I drew the lines from each pipe center. I know I tried just straight lines in this same area and did a sweep, which worked, so the space is not the issue. I'm thinking it might be what JD Mather noted, but maybe something else I'm not doing correctly.

Re: How to create a curved pipe/cylinder

dbroad — Fri, 11 Aug 2017 17:01:03 GMT

I just tried what you are trying to do. A radius smaller than the pipe did result in a valid solid but part of the pipe bend would be a sharp corner. (AutoCAD 2017). Performance may depend on which version you are using.

Re: How to create a curved pipe/cylinder

lbellino4 — Fri, 11 Aug 2017 18:51:49 GMT

Can you show me how you drew your lines before you did the sweep on this? When I do the arc/radius smaller, it doesn't look right/line up with the other pipe ends that I'm trying to line this up to. Thanks.

Re: How to create a curved pipe/cylinder

neaton — Fri, 11 Aug 2017 19:10:04 GMT

I think it does have to do with the second line not being tangent to the arc. I filleted the two straight lines with a 1.0 radius and then with the sweep command worked fine.

Nancy

Re: How to create a curved pipe/cylinder

john.vellek — Fri, 11 Aug 2017 19:16:18 GMT

HI @lbellino4,

I am not a pipe guy but I was wondering if you could Loft from the two existing pipes and possibly enter a intermediate loft profile. I did it from the two ends and it looks like a straight section of pipe with mitered ends. I don't know if that is impractical or not.

Re: How to create a curved pipe/cylinder

lbellino4 — Fri, 11 Aug 2017 19:27:02 GMT

This worked for what I needed. Trying to use other 3D commands forgot something simple as doing it this way...thanks!