Internet Source on Metal Castings, Fitting and Machining Techniques

GMT Glacern Machine Tools
Glacern Machine Tools is an innovative and progressive company, firmly committed to providing the finest quality and value in CNC machine tool products. GMT are an American company located in Southern California and strive to provide their customers with the finest quality products available in the machining industry. Their global network of manufacturing partners in the United States, Japan, and South Korea make it possible for them to combine premium quality and high performance with affordability.

Check out their "Crash Course in Milling" training series for conventional and CNC milling machines, covering all the basics:

Chapter 1: Basic Machine Anatomy
Chapter 2: Conventional Mill Operation
Chapter 3: CNC Mill Operation
Chapter 4: Work Holding
Chapter 5: Work Locating
Chapter 6: Tool Holding
Chapter 7: Face Milling
Chapter 8: Choosing & Using Endmills
Chapter 9: Drilling, Tapping, & Boring

South Bend Lathe Works.
South Bend Lathe is a brand of machine tools. Today's South Bend Lathe corporation is the successor to the original South Bend Lathe Works, an American machine tool–building firm that for many decades was one of the most important builders of metalworking lathes in the U.S. and in the world.
Read more on South Bend Lathe Works...

Old Southbend instructional movies contains knowledge that is still true and useful more than 70 years later. Old Southbend Instructional Movies Link