Just one pinion drives the axis (the "learn") though the second pinion is "preloaded" to remove the backlash (the "slave"). The preload is developed electronically by using a Distinctive motor controller; these programs can also be set up to generate jointly during cycle instances when backlash is just not essential. https://gearboxcvt86418.spintheblog.com/33064440/the-single-best-strategy-to-use-for-gearbox-cvt