Stan, Joe, et al,
I don't think this is an exact retread (get it, re-"tread"?!?!) of a stair discussion from a few months ago. If it is, slap me and send me on my way.
I just got a call from my steel fabricator asking ME a steel question! How's that for evidence of a parallel universe?! I built a curved front staircase and used 1 5/8" pipe for the handrail. I made some measurements and approximated the radius of curvature for bending the pipe. The steel company bent it to my radius and it actually fit.
Now someone is finishing a stainless steel spiral stair for a client, and they're trying to figure out how to bend the ss pipe for the railing. Figure 5'4" dia and 8" rise. How would you define the curvature for your steel fabricator? Thanks.