Z-axis with integral rotary table positioned independently from X and Y-axes. Servo drives for linear axes. Impala black granite used for guideways. Can use multiple scanning sensors including probes for detecting grind burn. Cover protects probes and sensors from dirt and damage. Workpiece diameters can range from 5-270mm. Internal gear diameters greater than 12mm, gear face widths up to 500mm and gears with helix angles less than 90-degrees can be measured.