CNC Stone Carving

The Carmelite Monks of Wyoming argue that computer-controlled stone carving can help make richly detailed Gothic architecture practical today, rather than reducing ornament to save time and money. They see modern machinery as consistent with medieval builders’ willingness to use the best technology available, and as a way for people familiar with computers to contribute to church construction. CNC means “computer numerically controlled”: software directs a machine along programmed coordinates. Stone-carving machines use diamond-tipped blades and milling bits to grind away stone, with water to cool the tools and clear debris. Common five-axis machines can move in several directions and rotate their heads; some add a turntable for tall pieces. Because machines can run unattended, they may complete a typical 40-hour workweek in under two days.

The monks use Prussiani machines from Italy to carve architectural details, including foliage, pinnacles, statues, and gargoyles. Their workflow starts with an artist creating a three-dimensional model, then programmers translating it into toolpaths, and sawyers preparing, positioning, and monitoring the stone. Programmers must select tools, control the finish, secure the stone, and prevent collisions; sawyers also use wire and bridge saws to cut simpler shapes efficiently, leaving intricate work to the five-axis machines. The account stresses that digital fabrication still depends on artistic judgment, technical skill, and coordination. It also describes a programming error that caused heavy window-sill stones to shatter overnight, while noting that the machine survived and continued working. Hand carving and pneumatic tools remain valuable parts of the broader process.