Hello - I am trying to sweep a simple rectangle along a 2D centerline sketch, which is on a plane 15 degrees off perpendicular.
As per picture below, when I do the sweep the shape twists at the vertical leg, even though I have selected normal to profile.
Can anyone tell me how to correct this?
Thanks
You might need to model each leg separately and then loft in between for the bend.
Hello Gary,
I can't be sure, but from your screenshot I wonder if the profile sketch is perpendicular to the path sketch? I know that may be a dumb question but I can't think of anything else that would cause that. I've attached a simple version that worked fine. If that doesn't fix it can you attach your part?
Glenn - the path sketch is on a plane that is 15 degrees off perpendicular.
I have attached the file.
Thanks
Gary
Gary Penelton wrote:
Glenn - the path sketch is on a plane that is 15 degrees off perpendicular.
That's why the body is twisted. If you don't want that, then you either need to make the path sketch perpendicular to the profile, or make the profile perpendicular to the path.
Gary
Ironically, it usually helps to select "Twist Along Path" to get rid of twist. Zero degrees twist is usually right.
Dwight
Maybe I misunderstood. Is below what you want?
Gary,
Is this what you are looking for when you mean no twist?
Paul
Paul - this is what I was trying to achieve, yes.
How did you do this?
Thanks
Gary
I believe Mark Biasotti outlined what Paul did.
Gary,
Mark Kaiser is almost correct, I wish I knew all these sweep options better! I did two separate extrudes and a tangent loft between the end faces. I only did it for a quick "something like this?" image because just saying twist isn't very clear. I still am not even 100% sure you are talking about the twist in the top view like I am but regardless... You'll really want to try both doing a loft and Biasotti's method. They yield slightly different geometry in the bent area. Using the vector option in the sweep property manager gets you a more clean bend, but it doesn't keep the top of the profile perpendicular to the path, but that is easily remedied.
Paul
Hi Gary,
Is this what you are looking for?
Along with what others have suggested, there is an option in Sweep>Path Alignment type to "assign a vector". Before the sweep, create an Ref Axis thru the Front and Top Plane. Then use it as the vector to control the orientation of your profile as it sweeps.
Mark
Depending on the design intent this might not actually yield the best results. Because of the way the direction vector constrains the twist the profile is not normal to the path in the vertical section, so the resulting strip is narrow.
Looks like a couple ahead of me gave the best answer. Here's something to think about though, doesn't it have to twist some? If you do two straight extrudes from the ends, the sides look like the picture below.
You might need to model each leg separately and then loft in between for the bend.