Umqhubi wemfumba obambe icala sisixhobo sobunjineli esisetyenziselwa ukuqhuba iimfumba, nokuba ngamaplanga okanye yintsimbi, emhlabeni. Isici sayo esahlukileyo kubukho bendlela yokubamba ecaleni evumela ukuqhuba ukusuka kwelinye icala lemfumba ngaphandle kokufuna ukuba umatshini uhambe. Lo matshini wenza ukuba umqhubi wengqumba asebenze ngokufanelekileyo kwiindawo ezivaliweyo kwaye ifaneleke ngokukodwa iimeko ezifuna ukubekwa okuchanekileyo.