loft issues user with limited knowledge

andre_grondin

hello !

for scale modeling a cement bulk trailer especialy the uder taker type of cones . i have limited knowledge on CAD ( 3years sporadicaly on onshape) but I read the forum and made many exercise on the loft feature but i don't understand !! also browswe many videos on LOFT and sweep to try to understand ow it works but soft far now I hit that wall . by the way i know and understand very well this is a very complex project for a les than expert user .

why LOFT #4 does not behave like Loft #3

using :

bulk cement trailer | bulk 53 zizgzag

i tried to create a extrude to have a face to work with nothings work why the red lines are criss cross and not connecting the whole surface to loft ( the loft #3 is working fine ) and I was sure i sketch it properly !

thak you ahead of time to any help that can be provided

heil dry_bulk2.JPG

regards

robert_scott_jr_

Hello Andre. Gurus here know why the loft fails. I don't know why but I became curious and found this which gives reasons why a loft might fail. However, another approach is creating a sketch on the surface of the existing part with the Use tool and then lofting one sketch to the other works. - Scotty

glen_dewsbury

Your selection is trying to make non manifold geometry due to intersecting faces.

Here is a sample sample for ideas.

https://cad.onshape.com/documents/5a0be6f2e1ca14a7dbf63e0c/w/6be4382f85a5e3f27bff2458/e/3ddc39bc6ecef133007a0507

robert_scott_jr_

Hello Andre. Gurus here know why the loft fails. I don't know why but I became curious and found this which gives reasons why a loft might fail. However, another approach is creating a sketch on the surface of the existing part with the Use tool and then lofting one sketch to the other works. - Scotty

andre_grondin

thx for replying I will try that again and see how it goes , what threw me of was loft #3 works fine and the same skething was done for #4 and failed , again i will try your approach and see , thx you so much

andre_grondin

nothing works anymore ! so I guess i destroyed something so hold on to try any answers sorry

glen_dewsbury

Your selection is trying to make non manifold geometry due to intersecting faces.

Here is a sample sample for ideas.

https://cad.onshape.com/documents/5a0be6f2e1ca14a7dbf63e0c/w/6be4382f85a5e3f27bff2458/e/3ddc39bc6ecef133007a0507

andre_grondin

thank you for all the help ! for sure i will go further and see how the rest goes !