Mu nganda zikora n'imashini, kugumana ituze no guhuza ibikoresho ni ingenzi muguhuza imikorere myiza nibicuruzwa. Imwe mu mashini zihagaze muriki gice ni ibikorwa bihamye bya grinder. Ubu bwoko bwa grinder bwagenewe byumwihariko kugirango tumenye neza gusya imizingo, akenshi ikoreshwa mubikorwa bitandukanye, harimo n'amasi