Make a helical cut into a splined surface?

[ochdx]

Hi everyone, I'm trying to create a rather oddly shaped stair stringer. It will have several radii, and direction of curves. The screenshot below isn't exactly what its going to look like - I just drew a quick spline and extruded it into a surface to show what I'm trying to accomplish. I need to "cut" the sufrace to reflect the height of the stringer (will be 16") and to follow its pitch.

 

Thanks in advance!

 

 

[JD Mather]

Attach the file here.

[kencaz]

Thicken your surface to a solid, Extrude your stringer through it, then Intersect. This will give you a solid stringer, however, you can easily explode back to a surface if needed...

 

 

KC

[SEANT]

The problem with taking a straight section or employing the PROJECTGEOMETRY command is that the stringer will not have a consistent Rise/Run. This is where a parameter mapping routine would come in handy. See sample.

CurvedStringer.dwg

[ochdx]

Hey guys, I managed to more or less build the stair, I thickened surface into solid and then intersected it by another solid and used the subtract command. It was very tedious but I'm 80% there.

 

I could never cut the quarter circle curve in the middle properly however - the cut would only be aligned with other two cuts either on inside or outside. So I exploded the solid and just left the surface that was aligned, and then tried to thicken it - but it keeps thickening in the wrong direction. So I actually doubled up on surfaces, and cut them separately.

 

I was trying to attach the drawing file, but its too large, I'm only allowed to attached 250kb, the file is 800kb

 

 

 

[ochdx]

I uploaded the cad file, see link below

 

http://69.118.132.19:83/files/8.zip