Metal Frame Barn,Metal Frame,Light Metal Frame Fenghua Jade Motor Co., Ltd. , http://www.china-steel-structure.com As is known, ordinary hobbing machines can only process involute spur or helical gears and cannot process involute bevel gears. The main reason is that the ordinary hobbing machine hob cannot be fed radially relative to the workpiece, or the radial feed and axial feed of the hob cannot be performed at the same time. To machine a taper gear, the gear hobbing machine should have four basic movements: the rotary motion of the hob around its own axis.