Help with a Loft

[laughingcreek]

I'm having difficulty making an expectable loft in the attached file.  I've tried many combinations of guide lines and partial lofts.  Any help would be greatly appreciated!

The current guides and last 2 lofts are there primarily to help visualize what I want to end up with, nothing sacred here, fully expect to have to change all of this to get what I want.

Here is a picture pointing out one of the areas that adds difficulty.  File attached.

[cekuhnen]

@laughingcreek

White arrow: bad idea to have surface touch - you need a gab to blend with loft better

hard edge to round edge blend is in Fusion and in general a hard task

you need to make rails that define the future surfaces

loft the point to curve surface last!

[laughingcreek]

ok, I'll back up and work with those points in mind.  attached is he closest I've come with previous approach.  not a very workable approach at all.

[laughingcreek]

General lofting question-

In previous example, I'm doing a lot of "splitting" of faces to have edges to use as profiles, and a lot of "project to surface" to have a line to smooth constrain rails to.  Are there better approaches, or are these good technics for these situations?

[cekuhnen]

@laughingcreek

To be fair this is a pretty hard surfacing problem to solve and to be honest Fusion is not well equipped to do it easily

Slicing of faces to get edges is a limitation of the tools Fusion took over from Inventor. Other programs can simply blend

to a surface edge and you specify from where to where along the edge you want to blend.

However besides all this I am curious if this shape is not better be done via T-Splines using the crease function for the edges that are sharp.

[TrippyLighting]

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@cekuhnen wrote:

Fusion is not well equipped to do it easily

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Period!

[laughingcreek]

latest attempt.  I can't get the loft command to except a smooth boundary condition at several edges.  and I think I'm using way to many separate lofts, but I can't figure how to set up the guide lines to use fewer. 

care to take a second look.

@cekuhnen, @TrippyLighting.  Agreed, loft tools in fusion are lacking.  Not worth further attempts?

@cekuhnen-I'm taking another shot with a t-spline approach.  Have had terrible luck with first couple of tries, but going a little better this time around.  corrective edits are going to be a real pain after the fact.  interestingly,  I'm having some trouble at the same places as I did with pure loft approach. bah 

[cekuhnen]

@laughingcreek

For a very long time did I suggest more investment into surfacing tools but I would say  the makers of Fusion see the need somewhere else.

Models like yours quickly show how limited and problematic Fusion will be when you come across the sketch bugs or the bugs in the loft code

like the one below! I saw that you have a crease there so I checked the loft fillet:

But again in all fairness this is also a hard model I would work some time on to get right in Alias or ZW3D.

[laughingcreek]

yeah, I couldn't see why smooth would fail at that spot.  I think it could be where rail 1 touches profile 1.  I didn't project my own line the main body there, but rather used an exiting face edge might try redoing that before giving up.