CNC Hobbing ---------
HOBBING (For Gears only): Gear hobbing is an efficient method to manufacture high quality and performance toothed wheels. Worm gears are hobbed by the "tangential feed" process on specially constructed machines .The tangential feed hobbing process employs a hob made up of two elements called the "rougher" and "finisher". The roughing portion of the hob is fed gradually into the gear blank first to remove metal from the gear tooth spaces. Next, the finishing portion moves tangentially through these spaces and generates the proper profile on the gear teeth. In this phase of the hobbing operation each rotation of the hob is accompanied by a slight feed movement tangential to the gear and has the effect of progressively creating a new series of cutting edges, by relocating them with respect to the gear. The gear tooth is therefore generated by an immense number of different cuts that result in an almost perfect contour in the finished tooth.