Good day.
I have a project to do a spiral stair.
What is the fastest way to do the spiral steps (speed is king :D).

something like this.
https://www.eurostair.com/spiral-staircases/standard/technical-information/..
Thank you!

Circular array has a vertical step value.

That is the one...got it.
one more thing what if the center runs in an angle...is there a way to go around the center in an angle while the steps stays horizontal?

Incline an Helix
Transform / Array on Curve / Rotation Flat

Thank you!

As an amateur stair builder, of about a dozen stairs over the course of many years, a few remarks:

As a youth, had the wind knocked out by a super steep, narrow tread stair. The rise and the run are important. Building codes apply. A rise of about 7 inches comes to mind. The run should be enough to accommodate the foot. Circular stairs can easily have too narrow a tread width on one side. (Historically, Right hand screw for sword defense.).

It is easy to mess up the rise for the first and last tread.

So triple check your math!

Railings should be continous, and/or not trap the hand, or other body part.
If a section of the stairs is straight, with extra wide outer curved section, the two slopes may well be of different slopes, and also the railing

Check out Google searches.

- Brian

There are also rules about 4 inch balls not passing through stiles, balusters/ spindles. (Baby's head, etc)

Engineer should design. And building Inspector approve...

So yes, I am hung up on safety.

Hi
You can use nodeeditor to do that parametrically.
I've made a node for it with a glance at bemfarmer's information. ( thanks )
Numbers are wrong, but I think it's a good point to start or play! :)

You could do the stairs and vertical step to generate the step count and footing by math,
Then boolean diff a slanted cone out to achieve the side shift of the steps. Then boolean diff and offset of the circle that encompasses the steps from the center of the array to get a nice symmetrical step sequence for the staircase to shift over

There are a few images of spiral stairs with a slanted support post here:
https://www.pinterest.com/pin/449093394104177833/


Some of the pictures achieve 180 degrees, from bottom tread to top tread.
(e.g., If the user starts up facing West, at the top, they face East.)
One achieves 270 degrees.
Headroom requirements might be a concern at the bottom?
The slanted support post seems to reduce the required shaft width by about 50%, side to side. +/-

The eestairs (Matadem's picture) have some dimensions. Even upside down and backwards dimensions :-), (Hard to read.)
They have a PDF brochure, and online design.
The online design could not be loaded, due to my not completing the specs...
Cost less than $4k.
They say that they are "code compliant or legal", for "tight space requirments, as supplemental stairs."
My "" means that I paraphrased.

- Brian

The geometry is still puzzling to me.
Is it a spiral/helix?

For 180 degrees,:
The left to right width is the width of ONE tread, plus support pole diameter, rather than TWO tread widths.
The front to back width is the width of ONE tread, plus support pole diameter. (Same as for a helix staircase)
So I guess that the form is 180 degrees of an OVOID helix???

The "vertical" hand rail is interesting.

Does MoI have an elliptical helix script?
Or Ovoid helix script?
Or Node?

https://math.stackexchange.com/questions/2952936/parametric-equations-of-an-ellipsoidal-helix

Should be relatively easy to do a script, or a node...

- Brian

Is the "pitch" constant?

There is a Canted Helix script...
And an Elliptical Helix script.
From 11 years ago... (They were posted on the forum, do a Search)

Hi Brian,

re:
> Does MoI have an elliptical helix script?
> Or Ovoid helix script?
> Or Node?

None that I know of. But you can use the Transform > Deform > Flow command to map a regular helix from its straight line axis onto an ellipse curve.

- Michael

Hi,
attached nod file might be of use.
Cheers
Barry

Kind of off topic but this looks like poor design trying to cope with restricted footprint....definitely looks restrictive to users who are anything beyond 5'10" or so due to the center being tilted like that. Trying to move one floor vertically in the space of a small coat closet makes this seem like an after thought or one of those "tiny house" solutions....

Thankyou Michael.

I'll have to try mapping a circular spiral set of treads, from its vertical post to a slanted post.

- Brian

The rise of each tread will be constant.
Tread length is roughly left to right shaft opening less post diameter less say 3 inches.

The left to right slant distance of the slanted post is roughly tread length plus 3 inches.

Edit: Will try out Barry's node.

Agree with Grendel. 6ft 5inch headroom is one code.
Grand arc of stairs from movies much preferred.

The geometry is interesting though.

came across this staircase. it looks awesome:

https://www.pinterest.com/pin/757167756116045765/

both safe and fun. i like that the steps are rectangular. the slide is just awesome. looks nice too.

"EllipticalHelix" node

Address:
Curves2/EllipticalHelix

Elliptical Helix script:
https://moi3d.com/forum/index.php?webtag=MOI&msg=5328.1

Elliptical staircase :)

this isn't a spiral staircase, but it's really awesome:

https://www.dezeen.com/2014/08/18/arquitectura-movimiento-wood-staircase-sdm-apartment-mumbai/

This is great stuff!

Good thread, thanks to all!

3D PDF built from MoI5 Beta attached...

That looks nice. I'm not familiar with 3D pdf. I opened it and it was like a static image. Are you supposed to be able to rotate, pan, zoom, etc... Or is it being static the way it works? I'm using Firefox's built in pdf viewer.