Txawm hais tias qhov yooj yim ntawm kev khiav hauj lwm ntawm theem hluav taws xob hoists, cov cuab yeej sway thaum siv yog ib qho kev nyab xeeb loj uas yuav tsum tau ua tiag tiag. Thaum sway tshwm sim, nws yuav tsis tsuas yog cuam tshuam kev nyab xeeb ntawm kev ua haujlwm tab sis kuj tseem muaj feem cuam tshuam rau kev ua haujlwm. Qhov no yog tshwj xeeb tshaj yog muaj tseeb thaum lub sij hawm nqa ntawm kev ua tau zoo props thiab theem teeb pieces. Yog hais tias lub tshuab hluav taws xob hoist sways thaum nqa lub nra hnyav, ob qhov kev pheej hmoo loj yuav tshwm sim: ntawm ib sab, nws yuav ua rau cov khoom sib tsoo thiab ua kom puas, cuam tshuam qhov kev sib tw thiab kev ua haujlwm ntawm kev ua haujlwm thiab txawm tias ua rau muaj kev cuam tshuam; Ntawm qhov tod tes, lub swaying hnyav load yuav deviate los ntawm nws predetermined trajectory thiab sib tsoo nrog theem chaw, teeb pom kev zoo, thiab suab khoom. Ntau qhov tseeb, yog tias muaj kev poob qis lossis cov khoom siv poob tswj, nws yuav cuam tshuam ncaj qha rau kev nyab xeeb ntawm tus kheej ntawm cov neeg ua yeeb yam thiab cov neeg ua haujlwm nyob rau theem, nrog rau qhov tsis txaus ntseeg. Yog li ntawd, kev tswj cov sway ntawm theem hluav taws xob hoists yog ib qho tseem ceeb ua ntej kom ntseeg tau tias muaj kev nyab xeeb thiab kev vam meej ntawm kev ua yeeb yam theem.
Thaum lub sijhawm ua haujlwm ntawm cov khoom siv, cov txheej txheem kev nyab xeeb yuav tsum tau ua raws li nruj me ntsis. Kev ua haujlwm hauv qhov chaw hnyav (xws li cua daj cua dub, nag hnyav, lossis cov plua plav ntau dhau) yog txwv tsis pub. Nyob rau tib lub sij hawm, nws yog nruj me ntsis txwv tsis pub nqa loads tshaj lub peev xwm ntawm cov cuab yeej, los yog kom tshaj qhov txwv ntawm 120 rated switching ua hauj lwm ib teev. Cov kev txwv no yog nyob rau hauv qhov chaw los tiv thaiv kev ua haujlwm tsis zoo ntawm cov cuab yeej siv vim yog overloading lossis nquag pib-stop cycles, uas tuaj yeem ua rau sway. Nyob rau hauv cov nqe lus ntawm kev khiav hauj lwm cov txheej txheem, lub hauv paus ntsiab lus tseem ceeb yog "ruaj khov thiab uniform ceev". Oblique rub thiab lifting yog nruj me ntsis txwv tsis pub - oblique rub yuav ua rau lub zog tsis sib xws ntawm qhov hnyav, inevitably ua rau hnyav sway thiab ib txhij ua kom nrawm hnav ntawm cov hlua hlau. Thaum txav cov cuab yeej horizontally, nws yuav tsum tau pib maj mam tso cai rau cov khoom siv thiab cov khoom hnyav kom maj mam hloov mus rau lub xeev txav ua ntej ua kom nrawm nrawm. Thaum lifting ib tug load, kev khiav hauj lwm yuav tsum tau ua nyob rau hauv ib tug maj mam thiab khov kho, thiab sai li sai tau lifting yog nruj me ntsis txwv tsis pub. Txawm hais tias kev tshuaj xyuas cov cuab yeej siv tau zoo thiab kev ntsuam xyuas ib puag ncig tau ua ua ntej, kev nqa sai sai yuav ua rau cov khoom hnyav hnyav vim muaj inertia, cuam tshuam qhov kev ua haujlwm ruaj khov ntawm cov khoom siv.