Kev ua haujlwm siab tsav tsheb, uas ua ke nrog Stepping Tsav thiab Pob Screws / Lead Screws kom tshem tawm kev sib txuas. Stepping Tsav yog ntsia ncaj qha mus rau qhov kawg ntawm Pob Ntsia Hlau / Lead Screw thiab Ncej yog tsim los tsim kom muaj lub cev muaj zog rotor ncej, qhov no txo qis cov lus tsa suab. Txhawm rau tshem tawm cov Coupling thiab cov qauv compact ntawm tag nrho ntev tuaj yeem ua tiav.