Double Column VMC DCM 2012

What are double column machining centers? The machining centers are the most advanced machine tools on the market. These types of machines have high automation and are capable of performing different machining operations (turning, milling, drilling, grooving, etc.), using computerized numerical control technology.Why do technical papers typically use two columns? It's much more space efficient if your text includes equations and figures, as they rarely take up the full width of a page. I find usually when I change from one-column to two-column in latex a paper becomes 30-40% shorter.