... ,crane,solar tracker and new energy field slew drive is a new kind of slew products.it ... .Compare with the traditional slew products,NFB slew drive is easy to mount and maintain,and saves ... -cal gear Worm transmission is equivalent to screw drive.multi-teeth meshing transmission is stable and low noisy ... wormdrives worm wheel,adn the worm wheel cannot drive worm.For example:self-locking worm mechanism is ...