ZP B for external gears, bores and end faces in one set-up ZP special machines Gear centres / Gear profile grinding machines ZP I/E with grinding arm that can be swivelled quickly for machining internal and external gears with large modules and gear widths ZP E/I with changeover between external and internal machining that does not require set-up 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 the machining processes achieves a high potential of cost-saving opportunities based on the following effects: Reduction of set-up, alignment and idle times Reduction of cycle times Realisation of smaller dimensions Reduction of scrap and reworking percentage No machining of auxiliary surfaces Reduction of space requirements 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 from the ZP series, the machines that are larger than 3 m, are available. 29