A gear hobbing machine is a specialized machine tool that is used to cut or shape gears, typically by using a rotating cutting tool called a hob. The hob is a helical cutter with teeth that are shaped like the gear being cut. The gear being cut is mounted on the workpiece spindle of the machine, and is usually a blank gear. The hob is mounted on the hobbing spindle, which is driven by a motor.

The hob is pressed against the gear blank and is moved along the length of the gear while it is spinning. As the hob rotates and moves along the gear, it cuts away material to create the gear teeth. The machine is equipped with a mechanism that moves the hob and the gear blank relative to each other, so that the hob can cut all of the teeth on the gear.

Gear hobbing machines can be used to make gears of different sizes, shapes, and types, including spur gears, helical gears, and bevel gears. They are capable of cutting gears with precise and accurate teeth, with tight tolerances and smooth surface finishes, making them suitable for a wide range of applications, including automobiles, machinery, and power tools.

Gear Hobbing machines can be operated manually or with the help of CNC (Computer Numerical Control) systems. These machines come in different sizes and styles, from small bench-top machines that are suitable for home or hobby use, to large floor-standing models that are designed for heavy-duty industrial use. They also have different hobbing speeds, sizes and capacities.

Overall, Gear Hobbing machine is a specialized machine tool that is used to cut or shape gears with precise and accurate teeth, with tight tolerances and smooth surface finishes, making them suitable for a wide range of applications in different industries. They are operated manually or with CNC systems and come in different sizes and styles, to suit different needs.