Usually, modern automatic transmissions consist of up to three individual planetary gears. In the simplest case, these consist of planetary gears, a sun gear, planet carriers and a ring gear. Planet carriers are used to hold the gears of a planetary gearbox. These planetary gears are being used more and more frequently due to their high efficiency. They are also characterized by their compact design as well as their high power density. WEISSER machining centers are predestined for the economical machining of these workpieces.