Chuck;
When I started into model making we were doing everything manually. We made wing conturs by what we refered to as straight lining which meant a set up for every cut. I started on the first NC mill that was put in th shop, ran a punched tape. Later we went to CNC. Actuallly these machines are in effect still straight lining, but you can run a whole contoured surface with one set-up.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra