There’s absolutely no room for error with the precision parts that MSP Manufacturing in Bloomington, Ind., makes for the aviation industry—including cases and clamps that hold a plane’s instruments securely in the cockpit, cooling vents for avionics, and switch guards to prevent pilots accidentally shutting down engines or, in fighter jets, launching missiles. To produce those crucial parts with sub-millimeter precision, MSP has long used CNC (computer numerical control) machines. These machines...