topic Re: How to model a nautilus shape in Inventor in Inventor Forum

How to model a nautilus shape in Inventor

eucci — Wed, 05 Apr 2017 20:03:45 GMT

Does anyone know a way to accomplish the Nautilus shape or Fibonacci shell in Inventor?

I've attempted a few ways without success. The Fibonacci geometry is actually a series of progressively larger arcs. This is ok but I'd prefer a more elegant solution that uses a spiral spline to drive the shape.

Any ideas?

Re: How to model a nautilus shape in Inventor

eucci — Wed, 05 Apr 2017 20:06:14 GMT

or like this...

Re: How to model a nautilus shape in Inventor

JDMather — Wed, 05 Apr 2017 20:11:20 GMT

What version of Inventor are you running?

Can you attach your attempt here?

Re: How to model a nautilus shape in Inventor

eucci — Wed, 05 Apr 2017 20:16:16 GMT

JDM

I'm running 2017

See attached for the 2nd attempt (not as bad as the 1st)

I actually incorporated an idea of yours from a previous post about creating a spiral feature on a sphere 🙂

Re: How to model a nautilus shape in Inventor

TheCADWhisperer — Wed, 05 Apr 2017 20:38:36 GMT

Getting curve right might be a challenge.

Re: How to model a nautilus shape in Inventor

salariua — Fri, 07 Apr 2017 06:06:18 GMT

You need to use equation curve for that.

https://forums.autodesk.com/t5/inventor-forum/3d-equation-curve-to-create-a-fibonacci-spiral/m-p/5753575/highlight/true#M556445

Check my attached model..

Re: How to model a nautilus shape in Inventor

-niels- — Fri, 07 Apr 2017 06:15:45 GMT

@salariua your model was made with 2017, your signature states your using 2015...

(tried to open your model in 2016, in vain)

Good link to the equation curve though.

Re: How to model a nautilus shape in Inventor

salariua — Fri, 07 Apr 2017 06:18:00 GMT

I apologize, I must catch up on my sleep first and then time to update the signature

Betreff: How to model a nautilus shape in Inventor

WHolzwarth — Fri, 07 Apr 2017 11:32:48 GMT

Some years ago I've been playing around with these surfaces in Rhino.

Inventor only can do 3D Math curves, but Rhino can do 3D Math surfaces, too.

Derived part of an imported Rhino file is attached (2011 IPT)

Betreff: How to model a nautilus shape in Inventor

eucci — Fri, 07 Apr 2017 13:31:11 GMT

This is all very helpful!.

Thanks for the input.

I had a couple solutions for the 2d curve already.

The tough part was coming up with a loft/sweep that would match the curve.

I will have to play around with it next week.

Possibly using TheCADWhisperer's sweep along with salariua's equation curve I can get something that matches.

Or, maybe it's just better in rhino, like wh says...

Thanks for all the help

I'll be sure to post back if I come up with a complete solution in Inventor.