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## Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

I just came across this Nest smoke alarm, and got curious about the pattern on the front: https://nest.com/blog/2013/10/08/meet-the-nest-protect-smoke-and-co-alarm/

Is it possible to somehow through one or more pattern features to create something like on the attached picture? I can't crack it myself. Help is appreciated

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## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

Interesting patterns came up when trying to do this without the reference. For the most part, I got the jest of how to make sure it could be mirrored. I used the arc to get a good pattern and the linear pattern with a "twist" for hole sizing and extrusion.

Full version of Creo 2.0 attached (minus the underlay image so it doesn't mess anyone up).

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## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

This can be done with a sketch and patterned.

It looks like it follows a simple arc increasing diameters.

You can just 2 guide arcs and make the holes tangent.

## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

Ah, I see.
My mind was stuck on the fill pattern, but I can see how it is possible with a sketch and a pattern around the center axis. I'll give it a try.

Thanks.

-----------------

Quick and dirty test:

It needs some adjustment to look more like the pattern on the nest, but it's definitly possible. Thanks for the help.

## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

Maybe:

pattern1:Arc with holes increasing in size as they go outward

pattern2:revolve pattern 1

## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

you could create that in less than 5 minutes with grasshopper3D

heres a similar example done in it.http://bit.ly/1kfaVgv

Isn't it basically offset circles from the corners of a square with points on the intersections?

## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

Its not fibronacci... more like spirograph with control of a common web thickness.

It wouldn't be hard to duplicate by using the image as an underlay and finding the right guide arcs.

It is a very nice industrial design application.

Esben, looking at yours, it is "drifting"? I was thinking you need to look at the mirror to see if it overlays correctly in both directions. I haven't tried it yet but I may give it a shot just for fun.

## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

Here's a more examples in Grasshopper with a grab of how you would do it in there. You might be able to look at the nodes and extract an idea of how to do it. I could give you more info if you have any questions, I'd give a detailed response now, but I don't have time.

http://bit.ly/1bKgPH9

http://bit.ly/1kfjuId

Here is a great reference with interactive examples. Probably your best bet.

http://bit.ly/1kfjHLp

## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

Agreed. I'm actually looking for a Spirograph for my daughter for X-mas.

## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

This is what I came up with so far. The mirror overaly is not resolved yet but I have an idea. One of the difficulties is the 84/360. But that is how it would be resolved. In this case, I just snuck up on it by checking a mirror circle in the sketch. You should be able to constrain it to be perfect.

As for constant webbing and such, it will require significant sketch control but nothing that can't be done.

## Re: Nest smoke alarm: How to create the "fibonacci-like" hole-pattern

When I saw this I first agreed with basically what Antonius and Davor said. But then I went to Google images and found a larger picture, and stared at that some more. And now I realize it's even simpler. no arcs, no nothing like that.

I will sketch on it a bit, and show what I think it is, in a little while.

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