The Talyrond XL is a roundness and cylindricity measurement system for large diameter and large radial-swing components. The system can measure components with diameters up to 1,000 millimeters. Key to its performance is a vertical column that sits on precision-bearing rails and can be adjusted and fixed in the radial direction to suit the diameter of the component under test. The system’s high-resolution inductive gage is attached to a radial arm with 300 millimeters of travel. The system has a frictionless air-bearing spindle mounted to a three-footed steel base with a high-load capacity. The system was designed using finite element analysis techniques to ensure thermal and structural stability.