Creating curves from equations

hi joseph
could you help me?
I have to do the development of a loft with 2 lines that must rotate with respect to 2 centers
according to the file the excell. to create 2 surfaces
one resides on the axis the other is movedjoseph2.3dm (177.8 KB) joseph.3dm (213.1 KB) 1-24.rar (13.3 KB)