topic Is it possible to create a radial pattern of concentric arcs? in Inventor Forum

Is it possible to create a radial pattern of concentric arcs?

TomPrem92 — Wed, 10 Aug 2022 17:44:29 GMT

Hi.

Inventor 2021

Is there any way to create a pattern of concentric arcs (or circles)? I wish to make a grill which would be adapting based on parameters such as count of ribs, several dimensions, etc. I can't figure out a way to make the arcs concentric and spaced by defined distance 😕

Re: Is it possible to create a radial pattern of concentric arcs?

Frederick_Law — Wed, 10 Aug 2022 19:04:03 GMT

When center points are coincident, they are concentric.

Add dimension between 2 arc. Select the arc lines when you add dimension.

Re: Is it possible to create a radial pattern of concentric arcs?

bwgilman — Wed, 10 Aug 2022 19:53:50 GMT

You might start with a User Parameter named (for example) "Offset". Give it a numeric value

Create a circle, dimension it.

Use the Offset function to offset the circle.

When prompted for a dimension, type "Offset" (without quotes)

Rinse and Repeat as many times as you like.

If you want to change the spacing, just change the value in the User Parameter.

Re: Is it possible to create a radial pattern of concentric arcs?

TomPrem92 — Thu, 11 Aug 2022 05:04:15 GMT

Yup, I know I can do that. However I want it to be adjustable using a pattern.

Think of it as if it was at design stage and I wanted to adjust number of ribs and their dimensions. And it was much bigger - could have anywhere between 10 and 100 ribs. Or if I needed several versions with wildly different amount of ribs. You wouldn't like to make that many individual ribs, constrain each of them and pick each for replace face tool.

Re: Is it possible to create a radial pattern of concentric arcs?

blandb — Thu, 11 Aug 2022 13:29:15 GMT

If you make your largest arc (towards the outer edge) terminate at the bounds of your yellow profile, then you could linear pattern that towards the center, adjusting the spacing and count. Now you can go and add the new arcs to the grill > Rib section. Draw back, you have to manually add as necessary. If you start with a full section of ribs, then decide to remove, it will bark. Manage > rebuild all does nothing, but if you edit the grill and then just click ok, it will fix itself.

Please see attached video for clarification, not sure if this would save much time or not lol.

Re: Is it possible to create a radial pattern of concentric arcs?

Frederick_Law — Thu, 11 Aug 2022 16:43:19 GMT

Technically what you need is group of offset arc. Not "pattern" or array.

Re: Is it possible to create a radial pattern of concentric arcs?

TomPrem92 — Fri, 12 Aug 2022 05:38:15 GMT

I believe in your solutions the arcs are only offset, not concentric.

I grow confident that there's no such tool in Inventor that fulfills this idea.

Re: Is it possible to create a radial pattern of concentric arcs?

WHolzwarth — Fri, 12 Aug 2022 06:38:07 GMT

I didn't know a quick solution by myself, but I found this:

https://www.cadlinecommunity.co.uk/hc/en-us/articles/203530761-Inventor-2016-iLogic-Ring-with-Concentric-Grooves-Example