topic Re: Creating spiral in Fusion Design, Validate & Document Forum

Creating spiral

SimonPlatten — Wed, 07 Jun 2023 07:59:37 GMT

I don't feel like I am making much progress, here is an image of what I have:

So far this is just the coil, I want to create a helix where the entry point is the at the top of the coil and is for example 20mm, then I want to join the bottom of the helix to the centre of the dome which is 10mm. I want this to be a spiral, I am struggling to connect the coil to the ovals top and bottom.

I'm trying to follow this:

https://www.youtube.com/watch?v=8WW2_HtuV9A

And so far I have this:

Re: Creating spiral

SimonPlatten — Wed, 07 Jun 2023 09:06:11 GMT

Now I'm having problems with the different object types where the coil was created as a solid object an the bit I need to trim was created in the surface menu, it seems one isn't compatible with the other so I cannot use trim.

Re: Creating spiral

HughesTooling — Wed, 07 Jun 2023 10:27:01 GMT

I don't have time to go through all of this again. The method in the YouTube vid is not the best.

I would create the helix using sketch and a Surface Sweep as this will be fully parametric.

Then use a tapered extrude set to intersect to create the tapered helix.

Now create 2 planes along path at each end of the tapered helix and sketch your tube profiles.

Then loft. This is all controlled using parameters.

File's attached.

Mark

Re: Creating spiral

SimonPlatten — Wed, 07 Jun 2023 10:32:15 GMT

Thank you, I will try again.

Re: Creating spiral

HughesTooling — Wed, 07 Jun 2023 10:35:33 GMT

Here's another version of the model. I've moved the part into a component so now you can copy it into your design and position and orientate using joint. Use the component origin to position in you design. I hope you've created the rest of your assembly following Rule #1 using components.

Marh

Re: Creating spiral

SimonPlatten — Wed, 07 Jun 2023 18:16:18 GMT

I've downloaded the file and am looking at it, but not at the moment able to replicate. On your first sketch1, there is a line that is dot and dashed, what is this and it looks like there is a constraint....looking at the sketch doesn't help a noob like me, do you have any instructions to go alone with it?

Re: Creating spiral

HughesTooling — Wed, 07 Jun 2023 18:44:02 GMT

I just set the vertical line to Centre Line type as it is helpful when creating revoled type parts. The lengths are set using parameters.

You can view and adjust parameters here.

The sketch is used in the sweep to create the helix

Re: Creating spiral

SimonPlatten — Thu, 08 Jun 2023 04:48:10 GMT

Thank you.

Re: Creating spiral

SimonPlatten — Thu, 08 Jun 2023 05:04:46 GMT

[Edit] posted edited to remove silly question.

Re: Creating spiral

SimonPlatten — Thu, 08 Jun 2023 09:05:05 GMT

Please see attached screen shot.

In my sketch the line that is shown in black according to your screen shot is to go into Profile, but I can't set it to the Profile, it will only go into the Path.

[Edit] Resolved....

Re: Creating spiral

HughesTooling — Thu, 08 Jun 2023 09:12:36 GMT

@SimonPlatten wrote:

Please see attached screen shot.

[Edit] Resolved....

I guess you figured this out? Looks like the vertical line got automatically selected when you started the sweep feature?

Mark

Re: Creating spiral

SimonPlatten — Thu, 08 Jun 2023 13:38:35 GMT

How do I get the "fx" menu option shown in your screen shot? It doesn't appear on any of the tabs I have, I'm using version:

Fusion 360 2.0.16265 x86_64 [Native]
Active Plan: Personal
macOS 12.6.6 (21G646) on iMac17,1

Re: Creating spiral

HughesTooling — Thu, 08 Jun 2023 13:49:53 GMT

It's on the modify menu.

Re: Creating spiral

SimonPlatten — Thu, 08 Jun 2023 13:56:17 GMT

Thank you, on your screen shot earlier it appeared at the top level. On your example, you have both lines in the same sketch and I've tried to replicate what you have, yours are not joined, in my sketch they are joined so I cannot select each for a separate selection.

Re: Creating spiral

SimonPlatten — Thu, 08 Jun 2023 14:14:27 GMT

What is this constraint and how was it created? I'm referring to the purple dot.

Re: Creating spiral

laughingcreek — Thu, 08 Jun 2023 15:24:00 GMT

@SimonPlatten wrote:

... in my sketch they are joined so I cannot select each for a separate selection.

try deselecting this in the sweep dialog-

Re: Creating spiral

SimonPlatten — Fri, 09 Jun 2023 07:39:45 GMT

Thank you, I need the helix the other way around, so the sketch is flipped, but the results are not the same:

[Edit] I think I can see my mistake now, I need to set-up the parameters and use Turns in the sweep.