figure out how many treads you need in the full circle (by degrees) and use the array command

Hey many thanks for the info. It helped

So you don't need a rutine for a 3D one ?

Yes I still do. Please help

Ok no problem -- I has a aincient Lisp program I once wrote for AutoCAD ver. 2.6 . I will work in any later versions tht evaluate AutoLisp , and I can post it if I just know your address.
How it work ;

You draw the first step and maybe the piece of railing with that.
These you make into a block -- the rutine will work with any entity but using a block will make one entity and the rutine work with only one entity.
Then you do some simple calculations , such as jow far in hight between steps, how many steps -- just count to many you can allway's delete what's more.
Then you load the application, type it's name and on you go --- a ladder to the moon ,even spiral stairs -- just count the steps or type in to many ; guess this is a detail I sjhuld have written into the application as it would have been easy , but when the application start it will ask a few questions , like asking you to point to the center of where it shal start , hight between steps, how many steps --- and as soon as you finaly are asked to point out "the entity" , you will be surprised how fast a spiral staircase are drawn 3D .
Just tell your mail address -- I can attach the lisp rutine to a mail.

Thanks for responding Per--Corell. I trust you had a good weekend. Here is my e-mail for you to forward your routine to me. It would be very much appreciated by myself and a few other folks. Thank you very much for taking the time out of your schedule.

[email protected]