Gear Hobbing Unit Highly productive manufacturing of gears with CNC Turning Centers. The Gear Hobbing Unit from WTO offers high stiffness and runout accuracy. Interchangeable milling arbor High versatility due to interchangeable ­available in different sizes milling arbors for different cutting tools. Usable for machining gear quality ­according to standard 8 ISO 1328, AGMA 8 Easy cutting tool change through removable counter support and withdrawal of the complete milling arbor Maximum scale swing of ±30° with scale and vernier