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September 19, 2017

In-depth: Shank Hobs


Gear hobbing is the most common manufacturing process for pre-machining of gears. A hob can be designed as a bore type or a shank type hob. Both types of hobs do have their own advantages. A bore type hob has a high flexibility to the machine tool interface. Due the choice of the most common bore sizes, this type of tools can mount on an additional shafts to be installed in different kind of hobbing machines. One disadvantage is the extensive adjustment during a tool change. For that, the tool has to be mounted on the shaft with spacers and clamped by different kinds of screws or hydraulic devices. Furthermore, the hob has to be aligned very precisely during every tool change. During the alignment, the operator has to check the tool runout and the position to ensure a sufficient part quality during hobbing.

To reduce the effort during tool change and improve the part quality after hobbing, highly accurate shank type hobs are available. These kinds of hobs are designed with a dedicated interface to the customer’s hobbing machine. This allows a quick tool change, because the hob and the shaft are combined in one component. Using a shank type hob, a runout alignment is not required. With that, shank type hobs are manufactured to a higher quality, and produce a higher and more consistent gear quality. Star SU offers a wide range of shank type hobs. We offer our customers a wide range of possible geometries with the state-of-the-art coating and cutting material technologies. Our shank type hob portfolio covers a wide range of module sizes and shapes. That includes hobs for the automotive, heavy duty or aerospace industry. The customer feedback confirms Star SU’s success in the design and production of shank type hobs.

Learn more about shank hobs here.

Dr. Ing. Deniz Sari 
Gear Technology Manager 
Samputensili/Star SU 


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