Thanks David, I had found a LISP routine here: http://www.cadtutor.net/forum/archive/index.php/t-78.html I used the 2nd one on that page and just renamed it Helix instead of Helcon. I edited it to create more segments. Also tried converting the polyline to a spline before using it as a sweep path. That makes the resulting 3D coil very smooth but I am not sure if the helix loses some accuracy when converted to a spline. I found how I can make a LISP routine load automatically every time CorelCAD starts but I want to figure out how to make a custom icon to run the command. I will also try to learn how to write my own LISP routines, having very limited programming skills (learned some BASIC and Fortran in the 80's). Should I find tutorials on LISP or would I be better off learning AutoLISP specifically? John
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