topic Re: Curved Staircase in Fusion Design, Validate & Document Forum

Curved Staircase

brandonbattle11 — Wed, 03 Dec 2025 19:20:09 GMT

I am trying to learn how to design a curved staircase. I have the inner diameter, the other diameter, the overall height, overall run of staircase (measured on the curve), the total number of treads, the rise per tread, and the run per tread (based on inner diameter). The inner diameter is 210" and the outer diameter is 273". The total rise of the staircase is 133.75". The overall run of the staircase on the inner diameter curve is 147.75". I have 17 treads. The rise per tread is 7.54" (I'm sure 7.5" will work). I'm not 100% sure where to even start. I've drawn my two circles and messed around with the coil function as well. If anybody can help me learn the correct process, that would be great. Thanks in advance.

Re: Curved Staircase

kacper.suchomski — Wed, 03 Dec 2025 19:25:01 GMT

Create a model of one stair step and a central pipe, then attach your design in another answer.

Re: Curved Staircase

brandonbattle11 — Wed, 03 Dec 2025 19:38:47 GMT

I will get started on this. Just to clarify, this is a curved staircase and not a spiral staircase. Not sure if there is a difference in design between the two, but just wanted to clarify.

Re: Curved Staircase

kacper.suchomski — Wed, 03 Dec 2025 19:40:19 GMT

We're still waiting for your step model.

It's also a good idea to include a handwritten sketch of your desired outcome on paper.

Re: Curved Staircase

brandonbattle11 — Wed, 03 Dec 2025 19:51:16 GMT

Here is what I have now. Also, a picture of my information I have for the project.

Re: Curved Staircase

kacper.suchomski — Wed, 03 Dec 2025 20:37:05 GMT

Thank you, but I'm waiting for a model of one step.
One specific step has a certain form and geometry.

Re: Curved Staircase

brandonbattle11 — Wed, 03 Dec 2025 22:57:37 GMT

Is this what you're looking for? Or closer?

Re: Curved Staircase

brandonbattle11 — Wed, 03 Dec 2025 23:21:01 GMT

I am now stuck here, if I am even on the right path. I need that 12" tall coil section to rotate and be on the inside of the stairs.

Re: Curved Staircase

TheCADWhisperer — Thu, 04 Dec 2025 00:52:36 GMT

@brandonbattle11

Assembly Constraints (or Joints).

Re: Curved Staircase

Warmingup1953 — Thu, 04 Dec 2025 07:35:14 GMT

Is this what you mean by run?

EDIT: Sorry the Forum posting is all at sea!

Edit 2: Construction method? Materials?

Re: Curved Staircase

brandonbattle11 — Mon, 08 Dec 2025 21:02:01 GMT

I am finally back to work on this project. If you dont mind me asking, can you clarify the steps you took to get that 12" flatbar attached to the stairs? This is an updated version of my project about as far as I can get. I need the steel and the wood to combine and not sure how to do that.

Re: Curved Staircase

kacper.suchomski — Mon, 08 Dec 2025 21:18:52 GMT

Look at this:

(view in My Videos)

Re: Curved Staircase

brandonbattle11 — Mon, 08 Dec 2025 21:40:49 GMT

That was awesome. Thank you for showing me new methods of assembly that I did not know. I will retrace my steps and practice this method. I have another question that I'm sure theres a simple answer to. I have figured out my flatbar and tread assembly, now I am trying to assemble angle iron on the bottom of the treads. I have one piece drawn in, perfectly centered on the tread and tangent to the curve of the steel. I tried to do pattern along path and cannot get the angle iron parts to spread evenly on my assembly. They need to be centered on each wood tread. I tried "spacing" and "extent". Got any advice? Attached is my latest model.

Re: Curved Staircase

kacper.suchomski — Mon, 08 Dec 2025 22:38:25 GMT

Two tools are used to define relationships between components: constraints (shown in the previous videos) and joints.

They should be used interchangeably, depending on the circumstances.

(view in My Videos)

Re: Curved Staircase

brandonbattle11 — Mon, 08 Dec 2025 22:52:02 GMT

Thank you. I'm wondering if there is a way to pattern that angle iron onto all of my treads or will I have to draw each angle iron piece in one by one?

Re: Curved Staircase

kacper.suchomski — Mon, 08 Dec 2025 22:55:48 GMT

No, you should insert subsequent instances of the same components into the project.

You should proceed similarly with the steps.

If the steps are identical, you should create a single model, insert it multiple times, and position it relative to the previous one using constraints.

Re: Curved Staircase

brandonbattle11 — Mon, 08 Dec 2025 23:03:06 GMT

Awesome. Thank you so much for the help. Love learning new things about fusion. Thanks for making that do-able.

Re: Curved Staircase

lauri_barnhart — Wed, 10 Dec 2025 17:17:46 GMT

Hello, @brandonbattle11,

Just checking in—did the responses shared by @kacper.suchomski, @TheCADWhisperer or @Warmingup1953 help clarify your question?

If so, please consider clicking the "Accept Solution" button. Doing so helps others in the community easily find useful answers.

If your question still needs more attention, feel free to reply here with an update. This way, other members can jump in with further suggestions or guidance to help you move forward.

All the best,

Lauri | Community Manager