Stuck on design, Program is smarter than I am!

[Anonymous]

Hey guys, first time posting! Im a gearhead, and I am designing a coupler for modern Mopar's to join a complete hellcat airbox assembly to the 392 engine, the coupler doubles as a smooth venture as well, now I printed my first functioning prototype from TPU and while the material flexs, it doesn't collapse like it should, its far too stiff, so I need add some ribs, or some accordion features to help it collapse under engine movement. I have added a Torus to the design but I am having trouble with it. I only need the outer portion of the Torus, not the inner. I lack the knowledge to do so and cant research a feature to work. Ill attach my file and hopefully someone can shed some light. I only need the outer edges to remain, the inner edges gone but I still need the interior contour to follow the outside of the torus's, so they can flex and collapse and expand on movement

[davebYYPCU]

While I am not totally up on what you want, I am thinking you need, 

take the timeline back to before the first torus, now in the

Patch area - Create > Offset, Select the inside surface of the tube.

Hide the solid tube, you should get,  surface tube that reps the inside wall of the tube.

Unhide the Body 4 Torus making sure it is a separate body

Body 4 is at the moment, so operating on body 4,

use Split Body, Select body 4 (target) and the surface tube as Cutter.  Hide / Remove the inside part of the torus.  Repeat as required.

when done you will need to consider Shell of each part Torus, and whether you can join with or without the original tube.

Might help....

[Anonymous]

I tried that with no luck, ive been trying for hours. closest I can come is if I make a cylinder set to cut and snap it to the center of the base and drag it upwards, it will hollow out the tub but then I have to pull or shell the remaining faces and even still it is no where near perfect, not even enough to print. its difficult to explain what I am doing, basically if you look at the outer shape, 3 dimensionally, I need that replicated on the inside just like .15 thick from top to bottom. ive attached a photo of the stiff prototype I made, installed, so you can see what im referencing 

[davebYYPCU]

How was the pipe made?, 

I presume it is a Loft, then shelled, or two Lofts, solid and cut?

I won’t be on a Desktop for a day or two to check the file out.

You could try the sweep command with a centre line path a coil Guide Rail, and the semi circle profile. ( Oversized bent thread)

Might help....

[daniel_lyall]

For the bottom bellow part, a revolve would be the fastest and easiest way to go it is more easy to adjust it with just a few clicks.

I used a pipe for the top loft was playing up, example attached.

[Anonymous]

that is LITERALLY exactly what I need just in my file. and ive tried everything and I just cannot grasp the procedure, I can see exactly what I need, this object is shaped the EXACT way it needs to be, I just cant hollow the bulges out

[davebYYPCU]

Will put a PM together.

[daniel_lyall]

You just don't do it the way you did it, it is an high over head way to do it using simple steps is what you want to do.

What is in the files is the simple way to do it that I know off.

All this is in the fusion learning I will doing a video on this soon.

Just forget about how you did it I am not quite sure how to explain it properly why it is the wrong way, one of the dev guys would have to jump in for why there where fails @jeff_strater if you feel like it please explain.

[g-andresen]

Hi,

For such things I prefer the T-spline-tool

The attached pipe was done in less than 5 minutes. (sreencast)

However, there is still some need for optimization.

have fun playing with it

 günther

[TheCADWhisperer]

All wrong and wayyy too much work.

Model as solid and then Shell.

 

(See Attached)

[daniel_lyall]

@Anonymous Now you have to decide what way you wont to go with your model, we can all do a video if you want on our own way of doing it. 

[Anonymous]

I tried sending you this in a PM but it wouldn't let me send a file. Of course, in my luck, I get a printable design. Go to export it to a print file.. wont let me select the entire object. only 1 of its apparent 2 pieces 

[daniel_lyall]

It will be easier for you in the long run to start a new model your model is in a very bad condition.

Red means it is a broken feature, yellow is a warning both need to be fixed but you have bits missing so some errors cannot be fixed.

It looks like you have the shape good, dave will be able to fix you up.

[davebYYPCU]

Your file had no structure, and many errors.

Copied your geometry, to a new file, and made use of the symmetry and origin to make life a little easier.

Not sure this is what you were after, whilst Fusion did not want to play my game, I got it sliced,  you will have to cut open the top opening, cause it is not considered as top layers, in my slicer at least.....

Might help....

[TheCADWhisperer]

---

@Anonymous wrote:

that is LITERALLY exactly what I need just in my file.

this object is shaped the EXACT way it needs to be, I just cant hollow the bulges out

---

What was wrong with the file that I attached?

[Anonymous]

I need to look at it again, but some of the measurements, I think, were off, the throttle body honestly sits at such an awkward angle it’s difficult to see, but I have 3d printed 4 prototypes to come up with the angles and stuff I have, so the ones I post I know will fully bolt up, I’ll look at that file one more time to double check, I had a real headache from being outsmarted all night haha

[TheCADWhisperer]

Oops, I should have placed my part overtop of your part and compared.

Just did that and I see that the axis at one end is off.

Fortunately my model is parametric and will be easy to edit.

Yours - Green, Mine Red

My new file attached matches your original.

[Anonymous]

i actually just printed that and it came out quite well, it is still FAR too stiff though, the ribs collapse but not as I intended, it would still really take serious force to compress but fitment wise its perfect, I thinned the outer by .05 and im printing it again now to test, is it possible to ONLY thin out the ribs? ive attempted shelling them, inside face and outer, and it doesn't seem to play ball. Because id like to leave the entire model your original thickness level, but if I can thin the ribs out by .05 im pretty sure ill finally have a successful and usable prototype, and thank you again 100% for this, you guys make this look so easy, I go over your timeline and im literally like WTF how did that work haha

[TheCADWhisperer]

Added a couple more ribs.

Hmmm, took a walk out to the car - I think I might have to completely redesign the ribs - my previous attempts were simply to reproduce your design in a way that would successfully shell.

[TheCADWhisperer]

A more "accordion" bellows geometry.

Bring the ribs out further for more flexibility. (assuming room in the engine bay)