I-actuator ye-ZR ye-axis luhlobo oluthe ngqo lwe-drive, apho i-motor egobileyo iqhuba i-screw yebhola kunye ne-ball spline nut ngokuthe ngqo, okukhokelela kwimbonakalo yembonakalo ehlangeneyo. Injini ye-Z-axis iqhutyelwa ukujikeleza i-screw nut yebhola ukuphumeza intshukumo yomgca, apho i-spline nut isebenza njengento yokumisa kunye nesikhokelo se-screw shaft.