OK, dumb question here. Since I have touted my successful Parker 514C 4000 RPM 10EE, can someone give me an application for 3000-4000 RPM turning? So far I have not used the field weakening for any part I have made, but since I have spent the last 15 years using my South Bends I am probably biased toward lower RPMs. Bison rates their cast iron 6" chucks at 3500 and the steel ones over 4000, but I start getting scared way before that.