CP2 Gearboxes
CP2 gearboxes combine a planetary transmission with a reduction transmission. For smaller substrates the gears unde the substrate bushings must become small as well in order to acheive a high capacity. With this the rotation speed of the substrates may become too high. A standard gearbos of OD Ø130mm with 24 positions increases the rotation speed of the substrates by factor 8. In case the planets themselves rotate at 15 min-1 the substrates will reach 120 min-1. This requires a lot of power and will create wear and particles. Smaller substrates may even fall off the fixtures.
In a CP2 gearbox the rotation is at a first step reduced by factor 10 before the transmission of the central gear comes into effect. So in total a CP2 gearbox has a transmission ratio of about 0,65:1. With this smaller substrates shake less and the gearbox itself may be operated at higher speed.
Teh reduction system limits some of the dimensions of the CP2 gearboxes. At the time the smalles OD is Ø125mm. The max. dimension for the central shaft is V15 or hexagon SW19. Small OD (<150mm) gearboxes are only available in the light design.
