any help on how to sketch this please?

[Anonymous]

Hope I'm posting in correct forum. This is a rolling circle cutter (used to make discs for dumplings) I am modelling and wondered if anyone was able to help with the geometry please? I started down the path of cycloids but realised very quickly that I was way out of my depth.

[chrisplyler · Accepted solution]

Thanks. Hopefully @TheCADWhisperer  likes it too.

[Anonymous · Accepted solution]

Well, Chris, that's fabulous. I've only just returned to my computer today and I've yet to digest it all but I'd like to thank you sincerely for your efforts, indeed everyone's efforts - trippy lighting et al -  in solving this for me.

I'm very grateful to you all. John

[TrippyLighting · Accepted solution]

There are three posts that you should mark as the solution: @MichaelT_123 mine and @chrisplyler 

[Anonymous · Accepted solution]

THank you Peter, only just got to see this and not fully digested your solution yet but I'm very grateful for your efforts and look forward to getting my head around it. Many Thanks. John 

[MichaelT_123 · Accepted solution]

Hi Fellows,  

Cookies and CADmen are the best friends, aren’t they?

They also give a tremendous service elevating CADmen alertness, innovativeness and passion for a new design. Chew Chew To Them!

As evidenced by responses to this thread, they also entertain and educate us. Chew Chew To Them!

… so let’s cut some more …

The below cookies cutting utensil has been designed based on a raw mathematical formula describing the curve of a circle-roller cutter.

       θ  = r/R * sin( t )

        x = R*cos(θ)

        y = r*cos(t) 

        z = R*sin(θ)  

where t∈{0,2*π}, r-cookie radius, R-roller radius

The file CookiesCutterCurve containing the respective sketch/curves is attached.

Parameters used are: {r,R} = {10,20/3},{11,22/3}

Serve yourself if you want to bake your own cookie in a CADstyle.

Curves file:

CookiesCutterCurve               https://a360.co/39YQI0h

4K video files (for private non-commercial use only😞

CookiesCutter_mono                https://a360.co/2RacKor       size: 20 MB

CookiesCutter_stereo             https://a360.co/2tTHvWv       size: 65 MB  (red/cyan anaglyph glasses required)

Chew Chew To Them!

MichaelT

PS.

Caution!!! Be aware of both side and bottom effects…

[TrippyLighting · Accepted solution]

Ha,

the movie reminds me of one of these old black-&-white French movies. If you give it a bit of vignetting, flicker and  and desaturation we night have our first Fusion 360 "classic". Yummy 😉

Joking aside, the curves you've created indeed have much better curvature than can be achieved with the "normal" modeling tools in Fusion 360.

It would really be tremendously valuable to have a "curve generator" available as a normal modeling tool.