Umphathi we-spherical roller ungumphathi we-rolling-element olwenzelwe kakhulu owenzelwe ukugqama ezimweni zokusebenza ezifunwayo. Isici sayo esichazayo yimandla ayo wokuzivumelanisa. Inxephezela ngokuzenzakalela kokuphathwa kabi phakathi komgodi nezindlu, okubangelwa amaphutha ekhuphuka, ukuqunjelwa kwe-shaft, noma isisekelo kuxazululwa (ngokuvamile kufinyelela ku-1.5 °). Leli khono elihlukile libenza babe yisixazululo esifanelekile sokufaka isicelo esibandakanya imithwalo esindayo, imithwalo emishayo, kanye nezimo lapho kungeze kuguqulwe khona ukuguquguquka.

Umphathi we-spherical roller ungumphathi we-rolling-element olwenzelwe kakhulu owenzelwe ukugqama ezimweni zokusebenza ezifunwayo. Isici sayo esichazayo yimandla ayo wokuzivumelanisa. Inxephezela ngokuzenzakalela kokuphathwa kabi phakathi komgodi nezindlu, okubangelwa amaphutha ekhuphuka, ukuqunjelwa kwe-shaft, noma isisekelo kuxazululwa (ngokuvamile kufinyelela ku-1.5 °). Leli khono elihlukile libenza babe yisixazululo esifanelekile sokufaka isicelo esibandakanya imithwalo esindayo, imithwalo emishayo, kanye nezimo lapho kungeze kuguqulwe khona ukuguquguquka.