Machubu owoneka bwino amagwiritsidwa ntchito kwambiri m'magawo osiyanasiyana, zida ndi zida zamakina.Poyerekeza ndi chubu chozungulira, chubu chokhala ndi mawonekedwe apadera nthawi zambiri chimakhala ndi mphindi yokulirapo ya inertia ndi gawo modulus, chimakhala ndi kupindika kwakukulu komanso kukana kwa torsional, kumatha kuchepetsa kwambiri kulemera kwake, kupulumutsa chitsulo.