Lofts though 90 degree angle

cory_rees

Hi all,
I Have been using Onshape for some time now but am struggling with getting a loft to work.
Long storey short, I'm trying to connect the 2 faces highlighted on the below model but keep getting "Did not regenerate properly: Could not determine loft direction".

I'm probably doing something stupid or something wrong but all help is appreciated. 

Thanks in advance

martin_kopplow

At the points where the two profiles for you loft meet the 'fold line' there will always be a tangency issue. Most likely, that loft is not going to deliver what you need anyway.

Try lofting along guide curves carefully laid out and leave the corner part open fow now, close that one later, using a patch or so.

David_YL_Nguyen

Hey @cory_rees,

If you could share a (public) document, people can have a look at the model and will be able to help you out.

My idea would be to loft only half of the bigger face along the edge of the smaller face. Might be easier if I could try it out on your model.

Cheers
David

cory_rees

Thank you both for your thoughts. The link to the file is below,
Thanks again.

https://cad.onshape.com/documents/34d7eb56d0264e6989d79e30

martin_kopplow

You probably just started off, and that's okay, but better think twice before you keep going further down the way you're on: There are many places in the file that will prevent the model to work downstream. The red face E.G. should not exist al all, it'll cause trouble ever after. There are intersections in your planform sketch. Then you obviously just extruded the train's profile and started hacking off volumes you don't want no more. That will always leave edgy shapes you won't be able to recover, and fillets will not save you, I know you already tried. Don't pile one feature upon the other when you make changes, rather edit the features already existing. That will make your model more robust.

The better approach would be to purposefully create your intent, what you really want, instead of cutting off the excess of something that came into existanence more or less by coincidence. Think first about the shape you intend to build, maybe even sketch it out on paper, then create curves to reflect the shape and skin them with surfaces. Use constraint in your sketches: Eyeballing it is not enough to get a reliable model.

I knocked off a quick loft, taking into account the elements that are already present in the train cross section. With a different set of guide curves, you could make it any shape you want:

https://cad.onshape.com/documents/6061d6f27694aa28ebb224ba/w/1cee62e5f944ca9aa9cc9dbe/e/14e1bf56e817d6b251658193?renderMode=0&uiState=6662d575e93ed915256dcd2a