Autodesk Inventor

[#1]

I wish to create a spiral stair but I'm locked here.. I've created the path which is a helix and the feature.. Which command is recommended to follow the helix path?

Thanks for any suggestion!

[#2]

Here's a start:

http://www.mcadforums.com/forums/viewtopic.php?f=5&t=11464

[#3]

Rectangular Pattern.
Rather than attaching an image file - attach the Inventor file here.

[#4]

The "wierd thing" is that this assembly/part must be fully compatible with AutoCAD (2008>2011) as if was built there. I wish to avoid complex techniques to build this stair due compatibility reasons.. I'm using Inventor 2012 Pro.

[#5]

There is a similar thread here:

http://forums.autodesk.com/t5/Autodesk-Inventor/Spiral-staircase/td-p/2385713

There I got a problem to make it happen in an assembly.

Any help please.

[#6]

Here's another wierd thing that I can't explain .. why after this corner profile goes under an agle (on YZ place) and not simply go on XZ path ? Futher (upper) the tilt is increasing..

[#7]

I am not familiar with analyzing or editing image files in Inventor.
Can you attach Inventor files?

[#8]

I did on previous post.

[#9]

I think I would use Frame Generator for this design.

[#10]

Sounds easy but I need 100% compatibility (further edit) with AutoCAD product..