Create a spiral line in a 3D Sketch

[Anonymous]

If I were to create a spiral sketch line old-style, I would probably create a series of offset planes stacked in the Z axis. Then I would draw a circle on each plane, after which I'd use construction lines to divide the circle into quadrants. So if I wanted to draw an upward spiral beginning at the 12 o'clock position on the bottom plane to the three o'clock position on the plane immediately above, I would have to project the sketch points.

With the greatly enhanced features of the 3D sketch function, it looks as if Fusion is creating the planes for me on the fly. Is this a safe assumption? In lieu of planes, can I use a single vertical line of the appropriate height from my 12:00 o'clock start position, then draw a second line of the appropriate height also starting on the bottom plane at the 3:00 o'clock position, and then the same at the 6:00 o'clock position, and so forth? Would I be able to connect all the points using arcs?

Do I need to use any projections in a 3D sketch, or can I just continue until the spiral is as high as I want it?

[etfrench]

3d spirals are called helixes😀  You can use the Coil command or create the helical path in the Surface workspace using the Sweep command.

[MichaelT_123]

Hi Mr ETFrench and RJspear,

Helix is a spiral ... but not all spirals are helixes.😲

Regards

MichaelT

[etfrench]

And all this time I've thought it was the other way  around 😓

[etfrench]

Here's a helix and a helical spiral😁

[mango.freund]

Hello @Anonymous , you can use the edge of the surface body as a path and adjust the angle of rotation.

to show I have formed a body. the height and the radius can easily be varied with the side length of the surface body.

I hope that was your question.                            greetings mango

[mango.freund]

or this way

[rushabhthakkar_910]

Screencast Video..!! https://autode.sk/3wQa42S 

[gamelife4dns]

I did such exercise months ago, a waved spiral ending into a waved helix with an arched transition between them.
243 points linked with one unique spline (was a nightmare to make...).
Search for "wicker basket (fusion 360)" on youtube 😉

Steve

[rushabhthakkar_910]

https://youtu.be/VLuv55ShEls  Wicker Basket..

[Anonymous]

Thanks for all the replies. I'm trying to create a certain spiral in Fusion while staying within the 3D sketch environment. The "spiral test" file I attached will show my approach, although it is a very simplified version of what I hope to do. The results I've obtained look plausible, but my eyes tell me that there are still some problems to address. If you look at the results directly from above, you'll see what I mean. I also cannot generate tangency between the arc quadrants, which should happen automatically.

Fusion recognizes the points on the vertical construction lines when I attempt a three-point arc (shows me a black square at the point), but it doesn't always end the spiral segment there. I tried another approach using a center-point arc and got better results. Part of my original question related to planes, but generating planes would mean leaving the 3D sketch environment.

The "silver point scroll" file will show my point of departure. Violin scrolls are very fluid and beautiful when done well in real wood, but in fact they are highly irregular in all dimensions, which has so far led me to a very fussy approach. If you have access to a violin scroll, looking at it will show what I'm up against.

The goal is to create enough of a model to generate tool paths for a 3-axis CNC machine, so the need for final finishing work by hand is a given. I'm OK with that The end result doesn't have to be perfect; "perfect enough" will do! 🙄

@Anonymous 

[etfrench]

If you adjust the shape of the revolved solid, you should be able to create a perfect violin scroll:

[TrippyLighting]

You can crate that volute rom the sketch you already have without the need for a 3D spline. Well .. at least this version  you can.

[mango.freund]

Hallo @TrippyLighting -- schoen, aber da bleibt noch viel zu tun bei deiner loesung mit all der radien.

vielleicht mag meine arbeit dem naeherkommen was der kollege @Anonymous braucht.  

maybe the colleague wants to combine his surface with my work so that it gets the curves that a violin has there. or does it start in the middle with a large diameter to become smaller towards the end?----------  lg mango  ----

[TrippyLighting]

@mango.freund if you google the term violin scroll you'll find plenty of references how that looks like.

The purpose of my example is to show how the base geometry can be creates with the existing sketches and only serves as a starting point. It is however a bit more complicated than a simple spiral 😉

It is not usually my attempt to complete people's work. I've helped the OP a good number of OP in other threads  and I am confident he will be able to get the key point from my model.

[sherinedias]

So with this method the line shows up on on the object. But now what if I want the object to be cut along that path! Oh n let’s assume tht the object is hollow with a wall thickness of let’s say 1 mm. Achieved by using shell command. 

[sherinedias]

So I get that line! Now I want to use that line and split the object! How do I achieve that?? Assuming the body is a hollow body of 1 mm thickness using shell command. Using ur method I have sketched everything! Now I just meet to split the body.

[sherinedias]

So I get that line! Now I want to use that line and split the object! How do I achieve that?? Assuming the body is a hollow body of 1 mm thickness using shell command. Using ur method I have sketched everything! Now I just need to split the body.

[etfrench]

Attach your file to make it easier to understand your question.

[sherinedias]

Thank you so much!! But I did put it up on Reddit and I got my solution!! I’ll attach the post for you here https://www.reddit.com/r/Fusion360/s/TWh6BLCUWQ