topic Re: Can't get a full shell. in Fusion Design, Validate & Document Forum

Can't get a full shell.

Anonymous — Tue, 06 Jun 2017 05:01:02 GMT

When I section this item it shows internaI webs that completely block water flow. It needs to be a full shell -- totally open inside. I had help this earlier which I understood as there was a bug preventing the removal of the hidden lines but that it should AM print ok anyhow. After seeing the section view I believe there was some miscommunication there. This needs to be a completely hollow shell. Anyone know how I get there from here?

Hopefully I've added the f3d file.

Much appreciation in advance,

Ron

Re: Can't get a full shell.

wilkhui — Tue, 06 Jun 2017 10:52:15 GMT

Hi Ron, nice design! What are you making?

Looks like these two bodies have been shelled independently (which is why you're seeing the 'webs') with Fillet7 applied much further downstream; there will be an inconsistent thickness in the region I've circled below where the filleted area is much thicker than the rest of the part. Is that part of the design intent?

I'd suggest the easiest workflow to get where you're trying to go would be to combine a simple torus, pipe and apply the joining fillet before doing anything else. Then shell that all as one body and apply the patterned small holes etc later on. Is that possible with the files that you have?

Feel free to shout out if that's not convenient!

Cheers,

Indy

Betreff: Can't get a full shell.

WHolzwarth — Tue, 06 Jun 2017 12:24:48 GMT

Here's my fight with it

Re: Can't get a full shell.

TrippyLighting — Tue, 06 Jun 2017 13:23:36 GMT

It's a bit more complicated to fix with the design as is and it's a bit of a hack.

Aside from having a yellow "missing reference" warning in your timeline, you applied the wrong sequence to your design.

It's simple enough, so I'd start from scratch.

There is not good reason to design the torus with the holes in a base feature in direct modeling mode and then do the rest in timeline mode.

1. Make a solid torus.

2. Make the bent sweep

3. Make the handle

4. Combine these three.

5. Now shel the thing.

6. Apply the rest of the details such as the holes in the torus and the ribs on the handle.

I personally would probably forego the ugly fillet that joins the handle and the torus and do a proper loft watching surface continuity.

Re: Can't get a full shell.

Anonymous — Wed, 07 Jun 2017 18:43:14 GMT

Missed this question in the first reply.

> What is it?

I'm helping out a Veterinarian friend. I believe it is for a washing apparatus of his design. He will add a coupler once he gets into a functional prototype.

Betreff: Can't get a full shell.

Anonymous — Wed, 07 Jun 2017 18:48:04 GMT

Walter, You put up a great fight. You taught me a lot and I'll stagger on from here. Thanks a lot. Ron

Re: Can't get a full shell.

Anonymous — Wed, 07 Jun 2017 19:04:40 GMT

Peter,

Now you went and hurt my feelings: Ugly? UGLY?

This is my first serious try and that's all too obvious. I'm sure you could do this drawing in a few minutes. For me it was hours over days but I've learned enough to be encouraged. I will mull over your comments and give it another go. For now I'm going to run down "missing reference, direct modeling mode" and "timeline mode."

Thanks so much. Ron

Re: Can't get a full shell.

TrippyLighting — Wed, 07 Jun 2017 20:52:36 GMT

Hi Ron, I sincerely apologize for my remark!

But to clarify, it really ONLY applies to the fillet and I'll show in a screencast what I mean its that.

Also, it is really not at all obvious to me that this is your first serious try. I had assumed you'd used other software before and just had some troubles getting a good workflow down in Fusion 360.

This goes to show that I need to watch my big fat mouth sometimes !

Re: Can't get a full shell.

Anonymous — Thu, 08 Jun 2017 17:32:13 GMT

Thanks, Peter.

Nah, my comment about your use of the word "ugly" was tongue-in-cheek. Getting serious for a moment -- which I'm loath to do -- your remark was very well taken. It will surely be addressed in the final iteration.

Don't change anything in your response style. Sometimes when we get engrossed in a new (to us) technology we tend to get too buried in the dash instruments and ignore what's looming large in the windshield. (And, yes, I'm old enough to speak for all mankind).

Now where do I find your screencast?

Ron

Re: Can't get a full shell.

TrippyLighting — Thu, 08 Jun 2017 17:43:02 GMT

@Anonymous wrote:

Now where do I find your screencast?

Ron

Well...ahh...hehe 😉

It seemed to be a very simple loft to do, but I spent 4 hours yesterday evening with one of the most knowledgable users @PhilProcarioJr to get that to loft properly and Fusion 360 resisted stubbornly. It crashed 5 times while stitching surface patches and threw so many incorrect errors and UI interface nonsense that we finally rerouted to do this with T-Splines and that also was only partially successful. All trying to create smooth surface curvature.

I am trying another attempt.

Just to be clear, the difficulties exist because Fusion 360's loft tool is really a piece of work with a schizophrenic nature. When it work it works beautifully right away. When it does not - and one can get there surprisingly quickly - it takes an extraordinarily amount o time and work to get halfway acceptable results it any at all.

In Spaceclaim this take literally only a few minutes.

Betreff: Can't get a full shell.

TheCADWhisperer — Thu, 08 Jun 2017 18:36:05 GMT

If I were going to tackle this design - my first question would be, "How will it be manufactured?"

The actual fabrication process would probably influence my design process and results.

Betreff: Can't get a full shell.

Anonymous — Fri, 09 Jun 2017 19:43:59 GMT

The present layout will be AM printed so the Vet can jerry-rig a coupler and test his system. After any required size and shape modifications it will go to the guys that spec materials, manufacturing method etc. -- not my bailiwick. I just follow the scribbles on the napkin and hope nothing blows up.

Thanks again guys for all the help.

Ron