Granite Machining Evidence

Christopher Dunn's engineering analysis of the granite sarcophagus in the King's Chamber reveals tool marks consistent with modern CNC (Computer Numerical Control) machining. The interior surfaces show a precision of 0.001 inches over large areas. Spiral grooves found in core drill holes cut into hard granite and diorite suggest a feed rate and speed that would require modern diamond-tipped drill bits. The concentric grooves cut deeper through the harder quartz crystals in the granite than the softer feldspar, which is the opposite of what manual abrasive drilling produces but consistent with ultrasonic machining. Petrie noted that the force required to produce these drill holes exceeded anything achievable with known ancient technology.