From site: The Virtual Machine Shop (VMS) is a web site dedicated to the perpetuation of machine tool knowledge and training. This project is designed and maintained by volunteers from industry and academia and is free to everyone. Please feel free to learn here. Please feel free to teach here.
Topics include CAD/CAM, CNC, Cutting Tools, Engine Lathes, Engineering, Geometric Tolerancing, Measure, Milling Machines. There is also a forum.