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Star SU offers gear hobbing tools in a wide range of sizes and configurations to meet diverse production requirements. Standard hobs are available in module (DP) ranges from 0.5–17 mm (50–1.5 DP) and diameters from 20–200 mm (0.75–8 inches), with larger modules available upon request. When applications require a hybrid hob or a completely new design, Star SU can engineer and deliver a customized solution.
Our hobs are manufactured from a broad selection of PM High-speed Steels, ranging from PM-M4 to super-alloyed grades such as S-290 and ASP2080. To further enhance durability and tool life, Star SU applies Oerlikon Balzers PVD coatings, including TiN, FNT (Futura Nano Top), TiAlN, and Alcrona Pro (AlCrN).
Star SU’s complete line of involute gear hobs are designed to provide maximum productivity through increased tool life and less secondary finishing. We carry a complete range of involute gear hobs for your hobbing needs. Learn more about our involute hob types below.
Involute Spline Hobs have straight sides teeth like a gear hob, and are usually of stub tooth depth. They are made in single or multiple thread designs, with diametral pitches ranged from 2.5/5 to 128/256 and pressure angles of 30°, 37.5°, or 45°.
These hobs are designed to increase productivity of the hobbing process. Advancements in hob manufacturing has improved the quality to allow finish hobbing with a multiple thread hob. Depending on the lead angle, they will be either straight or spiral gashed.
Single Thread Involute Hobs use straight angled sides for generating gears for maximum accuracy on gear hobbing machines. They are normally specified for processes where no subsequent tooth finishing operations are required, or where improved accuracy before tooth shaving operations is required.
Worm Gear Hobs are part of specific tools that match the worm shaft with sharpening allowance. This plunge cutting tool is manufactured in shell or shank designs with straight or spiral gash. Lead angles up to 45° are available.
Solid carbide hobs can be used in shell or shank design to cut gears with or without coolant, and are available in shell style with keyway or end drives, and various shank designs to fit most hobbing machines. Both “K” and “P” grade material is offered depending on application.
Star SU Non-Involute Gear Hob offerings include sprocket, straight key spline, and special form hobs. Special form hobs are designed for tooth forms such as square shafts and conjugate forms. Sprocket hobs produce accurate finishes and are available in single and multiple thread designs. Straight or tapered key spline hobs can include a special feature to produce root clearance.
Sprocket Hobs produce accurate finishes and produce the tooth form at one depth. These hobs are available in both single- and multiple-thread designs.
Straight or tapered key spline hobs have specially curved tooth forms and are made in single and multiple thread types. They are used to produce at only one depth of cut.
Special form hobs are produced for a wide variety of tooth forms such as square shafts, as well as conjugate forms for pump gear that transmit motion. Generally, these special hobs generate the correct tooth form at only one depth, so accuracy is critical.
Customized Hob Shapes can be designed and manufactured to your exact specifications. We provide custom special drive hobs and shank hobs.
Shank hobs are designed for today’s high cutting velocity tools with extra long active cutting lengths. They are designed for most machines in today’s hobbing machine market, including shank styles to fit the old Barber Colman hobbing machines to cut small diameter worm gear applications.
Special Drive Hobs can be designed and manufactured for any special requirement – from OD and face clamping to clutch key ways with special hubs.
Star SU delivers world-class gear cutting tools, advanced coating technologies, and engineering expertise that help manufacturers improve precision, productivity, and performance. Driven by decades of innovation and global expertise, we engineer complete solutions that support the evolving demands of gear manufacturing worldwide.