Based on the well-known ZP series, application-specific solutions have been developed. The machines of the ZP B model have been designed for complete hard finishing (gearing and reference surfaces) of external planetary and bull gears with a tip diameter of up to 3,000 mm. The combination of machining processes ensures a high potential for optimising workpiece quality while at the same time reducing set-up and machining times. The machines of the ZPI model are developed for profile grinding of highly precise internal gears with large modules. Especially the series production in the wind energy sector requires higher stiffness and stronger grinding power. A heavy internal grinding device was developed especially for this purpose, with the greatest emphasis on the rigidity of the grinding spindle bearing. The measuring device is permanently integrated in the grinding head which leads to a reduction of set-up times to a minimum. The machines of the ZP I/E model are used for high precision profile grinding of internal gears with large modules with a root diameter of up to 2,900 mm. The grinding arm is designed to allow it to rotate by 180°, thus the machine can be refitted for grinding external gears and special profiles within 30 minutes. The basic machines are equipped with a dresser, integrated measuring device, a balancing unit and comprehensive software. The concept of the ZP E/I model is based on the use of two independent grinding columns. Thus, these machines will be used by job shops primarily. The use of a common rotary table and the peripheral units such as cooling lubricant system significantly reduces the investment cost and floor space compared with two individual machines. Different rotary tables and column bases of the ZP series are available.