Create perfect spiral between two circles above eachother

[sgiorgioramsaroep (GiorgioR)]

Hi,

i was wondering how i could make a perfect spiral between two circles above eachother. both circles are the same with the radius. I want to divide the circles and then make a spiral between. And i want to connect those divided points to eachother. So it will be a ramp that is circular. I used the component Nurbs curve, but that component doesnt make a curve perfect between the circles, but a little in between. I will attach the file.Test wokkel file.gh (21.8 KB)

[ME_Mark]

Use Interpolate (IntCrv) instead.
Nurbs curve uses the vertices as the control points.

Edit: Actually Interpolate(t) gives a better result following the circles. The other one gives a slight deviation at the ends of the curve.
Test wokkel file_VME.gh (19.7 KB)

[HS_Kim]

Here is another way usingPoint Cylindrical.

Test wokkel file_re.gh (12.2 KB)

[akilli (Ethan Gross)]

Yet another way.

SPIRAL RAMP.gh (9.8 KB)

[Eliel]

hello, how to make a pitch spiral of 3550 mm and 418º?

It is something that a client sent from an online program, but I realize that I do not know how to do this type of spiral.

http://www.zhitov.ru/spiral_stairs/

[laurent_delrieu]

You can use polar array, move for each step and dome basics maths. I am sure there are scripts available for things like that.

l

[Eliel]

Thanks and regards

[anon39580149]

Use this as well

spiral shape.gh (8.4 KB)

[vikthor]

Hello I hope this is understood.
you just need to find the start of the Helix and then the spin number and use the native rhino command

[Eliel]

thanks it seems to be what I’m looking for, but I still can’t make it work I think it is necessary to somehow extend the 58 degrees shown by the helix @vikthor

spiral shape.gh (8.1 KB)

[vikthor]

see ↓
helix-418degree.gh (22.5 KB)

[anon39580149]

Check this
stair.gh (21.6 KB)

[Eliel]

That solved it! Thank you very much! @vikthor
Thanks for the complement! I’ll be showing progress @anon39580149

[anon39580149]

This is an update

stair.gh (18.4 KB)

[ShynnSup]

I see we share same group color preference

[anon39580149]

Other solution
spiral stair 2.gh (16.5 KB)

[Eliel]

thank you very much so I’m going