topic Re: problem with sweep a closed loop rectangle in Inventor Forum

problem with sweep a closed loop rectangle

slv.modd — Thu, 08 Mar 2018 20:55:36 GMT

Can anyone help me with this issue ?

I need to sweep one arc along a rectangle and get this error....see attached pic. sometimes I get the volume but sometimes fail...same is in Fusion 360 !

Re: problem with sweep a closed loop rectangle

johnsonshiue — Thu, 08 Mar 2018 21:49:24 GMT

Hi! It should work. Could you attach the part file? I would like to take a look at the file and understand the behavior better.

Many thanks!

Re: problem with sweep a closed loop rectangle

jhackney1972 — Thu, 08 Mar 2018 22:25:23 GMT

You did not supply your model and you did not say what type of line makes up the top of your profile. I am guessing it is a spline and that is why you are having issues. If you constrain the vertical profile line to the center of the rectangle, like your should, it will fail. If you move it off center ever so slightly, no issues. If you use an arc, probably three point, you can constraint it to center without issue. I cannot explain why a spline fails in this situation. I used to design tank ends and fought it all the time. See screencast.

Re: problem with sweep a closed loop rectangle

TheCADWhisperer — Thu, 08 Mar 2018 22:33:39 GMT

Is there a logical reason that you have not fully defined your sketches?

Is there a logical reason for Workplane1?

Can you File>Export and then Attach your *.f3d file here that fails?

Re: problem with sweep a closed loop rectangle

slv.modd — Fri, 09 Mar 2018 09:37:58 GMT

@jhackney1972 - thank you for post

regarding this "If you move it off center ever so slightly, no issues. If you use an arc, probably three point, you can constraint it to center without issue. I cannot explain why a spline fails in this situation. " If I did this every time I think I must patch each time the center of the body after sweep...Hmmm, is not that a glitch ?!

For other - unfortunate I was frustrated of this behaviour and not save the failed file, I will try again today and attached the file.

Re: problem with sweep a closed loop rectangle

slv.modd — Fri, 09 Mar 2018 10:37:55 GMT

Here you have one attached file.

If the vertical line of the profile is placed on the midd of the rectangle then the sweep will fail; like @jhackney1972 already said....If the curved line of the profile is one arc (instead spline) then the sweep will be OK.

Re: problem with sweep a closed loop rectangle

TheCADWhisperer — Fri, 09 Mar 2018 12:39:31 GMT

@slv.modd

What exactly are you attempting to model?
The part does not look aesthetically pleasing to me (see attached).

I suspect that I would probably use Loft to Point (or maybe Boundary Patch) for whatever it is you are attempting to model.

Re: problem with sweep a closed loop rectangle

slv.modd — Fri, 09 Mar 2018 13:03:59 GMT

So, CAD whisperer

Instead one operation I must do 4.....and glitch is solved !

About "aesthetically look", I accidentally fall on this, when I intend to do some frames.

Sorry, I'm beginner and have no experience ,.... regard to please you.

Re: problem with sweep a closed loop rectangle

johnsonshiue — Fri, 09 Mar 2018 18:11:29 GMT

Hi! I took a look at the parts. I believe there is indeed a bug or a limitation here. The spline profile exhibits inconsistent behavior. If you set the output type to Solid, the sweep will fail. But, if you set it to Surface, the sweep will work but some faces are not trimmed properly. I will work with the project team to understand the behavior better.

Many thanks!

Re: problem with sweep a closed loop rectangle

kelly.young — Fri, 09 Mar 2018 22:18:43 GMT

Hello @slv.modd thanks for attaching your parts.

Attached is a different approach with simple commands to achieve the same result.

Lots of different ways to go about modeling! Hope that helps.

Please select the Accept as Solution button if a post solves your issue or answers your question.

Re: problem with sweep a closed loop rectangle

slv.modd — Sat, 10 Mar 2018 09:28:41 GMT

@Anonymous

Thank you for reply.

I believe that Inventor or Fusion 360 are great softwares, and we are here to points problems in the ideea to improve it, not to blame it or errors hunting ...

I'm certain this will be solved in some how in to the future.

In regard of other ways to solve this small sweep bug - I'm sure there is multiple ways to do it or to cure .So thank's on all for posted tips .

Mean time I will accept @jhackney1972 as solution, it is the most easy to do.