Cant get my loft along a guide

heiko_augustin

Hello,
i am trying to get the 2 cone profiles to loft along that edge, but i cant get it to work.

What am i missing out, who can help?

Thank you!

robert_scott_jr_

Please post a link to your document.

heiko_augustin

Oh sorry.
Too sad, i was confused by the forum, had Discussions, Questions, and non of them showing up. I was sure to put in a link everywhere, but obviously i did not.

Here:
https://cad.onshape.com/documents/86c451d68fcdf251825af89a/w/90cb2c46423d94b8ba86d73c/e/a846fb1e04a2e68cafbed461?renderMode=0&uiState=64f1e89865d84424b92a0c45

And thanks!

glen_dewsbury

Here is an example. Loft with guides. It will show errors while you are selecting guide curves because the guide is incomplete. Keep going.
Also, if the profiles at each end are intended to be the same? Then it's simpler to use a sweep.
https://cad.onshape.com/documents/5f6784eb8e627bd2935ff8c4/w/d6abc552e8f2b733b7c9f1fc/e/aaaafbfae64372fbb245025a

heiko_augustin

Thank you so much!
No, the 2 profiles are not the same. The part shall be a clothes hanger. I wanted to strenghten the lower part with a bigger cone and make a veeerrrry smooth transition to the upper part with a very small cone. The crazy thing is, I was on the right track all the time.
But, if I make the upper profile / cone smaller, it leads to a self intersecting body.

I dont really understand why that happends, or what exactly that means. Would anybody explain that to me?

glen_dewsbury

@heiko_augustin
Needed another profile and guide to improve the inside corner. Still not perfect but better. There is some bulging in the upper section. You may need to figure out another profile for the lower end of the upper profile.
https://cad.onshape.com/documents/5f6784eb8e627bd2935ff8c4/w/d6abc552e8f2b733b7c9f1fc/e/aaaafbfae64372fbb245025a

heiko_augustin

Hello,
i still need to learn.
With the new information and learning i started over:
Garderobenhalter neu | Halter schlanker (onshape.com)

I still cant get it to work.
As i am confident to use all the learning, i pieced the guides to the profile, i thougt about the order, i made the selections for the guides brave.
Right now, i get the error "cant loft with the given information.
Would anybody please look into it, i am pretty sure i did exact the same then in the example above.
But i cant figure out, what i am missing or doing wrong.

Thanks

S1mon

Sketch 7 needed to have two tangent constraints between the arc and the straight lines - then it works.

heiko_augustin

Ah yes!
Thats nice, I finally got the full controll over my loft.

Obviously i still got a lot to learn.

@S1mon Of course my sketch was not fully contrained, what should always be, i know.

Still, i want to understand what the problem was. I mean, it was not too much away from a tangent. Why was Onshape unable to use the guide? What is the problem, so i can avoid these situations in my future designs?

Thank you

S1mon

Loft is intended to create a continuous surface. It's also required to go through the guides within a very tight tolerance. When the guides are not at least G1 (tangent) continuous, it's impossible for it to do what it's supposed to do. You probably could have created a fill surface with the sample option for guides.