Help for Stair

charly2008

Hi TIG

Thank you for your detailed instructions. Maybe I expressed myself wrong. I was looking for a technology to produce this corner treads.
I tried it with rotate face, Maybe there are better solutions.

Charly

honoluludesktop

@charly2008 said:

Thank you for your detailed instructions. Maybe I expressed myself wrong. I was looking for a technology to produce this corner treads.
I tried it with rotate face, Maybe there are better solutions.

Don't understand. Typically there is a square landing when the steps change direction (by 90 degrees). But when you suggest rotate face, I visualized the following:This arrangement is dangerous because the "go" of the thread closes to the outside edge is almost zero. In my part of the world, this is not allowed.

honoluludesktop

Opps, you posted while I was drawing. The problem remains in your step. It is easy to slip and fall if you place your foot on the "go" that is zero.

TIG

CharlyWhat you illustrate is the correct way to form those 'corner-treads'.***
What I was trying to show you was that you didn't need them with the constraints you showed - a square landing would work...
But IF you corrected the fl-fl to something more likely AND you constructed the stairs according to accepted norms then you'd need to make 'tapered-treads' in the corners.
There are general rules for calculating these.
You haven't followed them.
***Your illustration does show the correct way to model this type of treads... BUT what you'll get won't pass the likely regulations - or if there are no regs then they will just be awkward/dangerous to walk up/down...
So I suggest you take some early decisions about making a compliant set of stairs... and then model them in 4d from a simple 2d interpretation... Otherwise you'll end up with an almost convincing set of stairs that would never get built in reality.......

EDIT: Honoluludesk's version doesn't work as the tapered-treads are to small at the thin end [you could fall an kill yourself! - hence the UK min. 50mm rule]. Also the tread dimension at its center should be equal to the tread size on the rest of the 'straight' flight... Again making it anything else might cause a stumble - especially if it's less......

charly2008

I thank you for the efforts that you have made. The staircase is only for a wooden house model. I have looked at the plan again and I think so it fits.

TIG

It is 'made' correctly in the SKP... BUT the going measured on the center of the tapered tread isn't the same as the going on a straight tread... so it isn't 'safe' !
There are rule a bout making a staircase safe to use - yours isn't right.

dtrarch

Charley
Save yourself some grief and just download the all the stair scripts from the following:
http://rhin.crai.archi.fr/rld/plugins_list_az.php
Good place to start and you can just do the "winders"
in place of the landing on the "U" type stair.
Also look up stair layout on the web for some stair basics.
(Uniform Building Code a start)
http://www.blocklayer.com/stairs/stairseng.aspx
http://www.stairplan.com/winderplan.htm
Hope this helps a bit.

dtr

honoluludesktop

It looks like you are doing log construction. Why don't you do the steps out of logs split down the center? Winders are a finished carpentry that may not match the overall design.

charly2008

Hi,

thanks again for your help.

One thing I've learned by now that the stairs calculation is very complex. Especially when one has to learn all the technical terms. I have now found a demo program for the calculation of stairs. Unfortunately you can not export the models in the demo version. Therefore, I imported a snapshot of the plan into Sketchup.

Charly

TIG

Great!
As you can see from the resultant images making a compliant staircase with tapered treads etc is far from easy...
As you say, you can now take the plan image, import it as an Image and Scale it [TapeMeasure tool] to the correct size; then use it as a basis for making the stairs...