1 pinion drives the axis (the "learn") even though the second pinion is "preloaded" to eliminate the backlash (the "slave"). The preload is made electronically using a Specific motor controller; these systems can be create to push together in the course of cycle periods when backlash is not really significant. https://gearboxcvt75297.ja-blog.com/32741835/gearbox-cvt-secrets