merging and hollowing two lofts

mark_prince

Hi All

I'm trying to model and 2-into-1 exhaust collector, and I've managed to create the shape I need, but I can't work out how to hollow it. My part is here. I've tried using shell, and in the top and bottom circles, creating an inner circle and then trying to loft-remove between them, but I'm failing. I need a constant wall thickness.

Can you help?

NeilCooke

Hi Mark - you can only shell solids, not surfaces. Make a solid loft between the faces then try again?

brian_brady

NeilCooke said:

Hi Mark - you can only shell solids, not surfaces. Make a solid loft between the faces then try again?

Neil (and Mark),

I worked on a copy of it last night for about an hour and discovered early on that what Mark had was not solid. I changed the loft to make two solid lofts instead of surface lofts. For the life of me, I couldn't  make a shell that worked with 2 inputs and a single output. I tried splitting, boolean operations, and more that I don't currently recall. All to no avail. Maybe somebody more practiced with these types of shapes will have better luck than me.

NeilCooke

I remodelled it - see if this is what you are after: https://cad.onshape.com/documents/57d1213d6eb98510b91797ed/w/4da614a5b1bbe1e52ac3b516/e/0114b6206874307a5d078cf3

brian_brady

I was trying to maintain Mark's original shape. Yours is less "organic" than his original. Maybe the more "organic" shape Mark started with was causing he strange problems I was having when trying to merge the two lofts together.

NeilCooke

Maybe, in Mark's original model the lofts were actually twisted which doesn't help.

brian_brady

NeilCooke said:

Maybe, in Mark's original model the lofts were actually twisted which doesn't help.

That might explain why they neck down a bit in the middle when just lofting from one circle to another.