Finally the hob is fed through the workpiece parallel to the blank's axis of rotation.Often multiple blanks are stacked, then cut in one operation.For very large gears the blank can be to the rough shape first to make hobbing easier.Equipment.Ī horizontal hobbing machineHobbing machines, also known as hobbers, are fully automated machines that come in many sizes, because they need to be able to produce anything from tiny instrument gears up to 10 ft (3.0 m) diameter marine gears. The hob is then fed up into the workpiece until the correct tooth depth is obtained. If the hob has multiple threads the speed ratio must be multiplied by the number of threads on the hob. The two shafts are rotated at a proportional ratio, which determines the number of teeth on the blank for example, for a single-threaded hob if the gear ratio is 40:1 the hob rotates 40 times to each turn of the blank, which produces 40 teeth in the blank. For example, if a spur gear is being produced, then the hob is angled equal to the of the hob if a helical gear is being produced then the angle must be increased by the same amount as the helix angle of the helical gear. The angle between the hob's spindle (axis) and the workpiece's spindle varies, depending on the type of product being produced.
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