topic Re: Create a rounded surface in Fusion Design, Validate & Document Forum

Create a rounded surface

Anonymous — Tue, 12 Jun 2018 06:43:37 GMT

I'm trying to model a small pendant for a friend of mine, but the top needs to be rounded in such a way that the highest point is always 5mm. This is the profile I'm trying to extrude.

I'm not 100% sure how to word my problem. I guess the best way to describe what I want would be that if a path were to go from the top point around to the point where the two circles meet, and you were to look at the profiles along that path, it would be a series of half-ellipses, but each one would be slightly different based on parameters. I'm still kind of new to Fusion, so there's probably an easy way of doing this that I just don't know yet.

Re: Create a rounded surface

Anonymous — Tue, 12 Jun 2018 09:29:23 GMT

Does the sketch geometry in your screenshot already reflect the silhouette of the extruded geometry you hope to achieve?

Re: Create a rounded surface

Anonymous — Tue, 12 Jun 2018 09:29:26 GMT

It would go upwards from that profile, rounded so that the top would meet this black line which I've drawn at roughly 5mm

Re: Create a rounded surface

Anonymous — Tue, 12 Jun 2018 10:05:14 GMT

OK. I think what you may be saying is you want maximum rounding while still achieving a 5mm extrude from all important points the profile. Interesting problem. Will follow up when I have something to show...

Re: Create a rounded surface

Anonymous — Tue, 12 Jun 2018 10:05:42 GMT

Is this the effect you are after?

Note that my example has radically simplified geometry so you can better understand the variable radius fillet technique.

Re: Create a rounded surface

Anonymous — Tue, 12 Jun 2018 10:03:50 GMT

Here's what a constant radius fillet looks like:

Re: Create a rounded surface

TrippyLighting — Tue, 12 Jun 2018 10:48:24 GMT

Is this the shape you are looking for ?

Re: Create a rounded surface

Anonymous — Tue, 12 Jun 2018 11:08:57 GMT

That's exactly it yes. If you want to know it's the Fox Miraculous from MLB. How do you make that?

Re: Create a rounded surface

Anonymous — Tue, 12 Jun 2018 11:18:16 GMT

Looks like I completely misunderstood. Maybe someone will still find my example useful!

Re: Create a rounded surface

TrippyLighting — Tue, 12 Jun 2018 11:38:33 GMT

This is a T-Spline. I used the sketch a s visual guideline to create it. I started with a "notmal" cylinder and scaled it down in the Y-Axis to achieve the ellipse profile you were looking for.

Then I simply extruded, scaled and rotated the edge loops.

File is attached.

Re: Create a rounded surface

TrippyLighting — Tue, 12 Jun 2018 12:27:35 GMT

@Anonymous wrote:

That's exactly it yes. If you want to know it's the Fox Miraculous from MLB. How do you make that?

In that case, please mark my reply as the solution.

Re: Create a rounded surface

Anonymous — Wed, 13 Jun 2018 06:16:41 GMT

Can I get a screencast of what you did? As I said, still pretty new to CAD.

Re: Create a rounded surface

TrippyLighting — Thu, 14 Jun 2018 15:46:23 GMT

Here's a screencast that shows how to o this with T-Splines. This has indeed very little to do with traditional CAD.

Re: Create a rounded surface

Anonymous — Fri, 15 Jun 2018 03:44:11 GMT

Thanks for the help! Is there any way to make those edge loops snap to existing sketch geometry? Or what about if I added a series of work points along the sketch curves?

Re: Create a rounded surface

mavigogun — Fri, 15 Jun 2018 04:13:07 GMT

@Anonymous wrote:
Is there any way to make those edge loops snap to existing sketch geometry? Or what about if I added a series of work points along the sketch curves?

I like to create bodies to snap to. In the Sculpt environment you can create a body representing a cross section to snap to, such as an extruded sketch profile- a tool you can dispose of retain; when attempting to conform to 3 dimensional volumes, prepare a solid body before entering the sculpt environement, then perform a Pull or Point Edit in the Sculpt workspace and Snap to Object.

Re: Create a rounded surface

Anonymous — Fri, 15 Jun 2018 04:11:11 GMT

So I'd extrude out the sketch before working with the form? Then just make the body semi-transparent?

Re: Create a rounded surface

mavigogun — Fri, 15 Jun 2018 04:20:04 GMT

@Anonymous wrote:
So I'd extrude out the sketch before working with the form? Then just make the body semi-transparent?

Ya, transparency can be super helpful for selecting verticies or control points. Say you were making a wing- you could extrude cross sections to snap the wing splines to. Or you could create a cyclinder representing a bicycle head tube, freely edit the organic portions of the frame, then snap the organic frame to the cyclinder extremes. Try it.

Re: Create a rounded surface

Anonymous — Fri, 15 Jun 2018 04:29:06 GMT

I feel like I'm doing this wrong. Can you share a screencast so I can see someone who knows what they're doing?