Crushing tov khoom yog ib hom kev tsim kho tshuab feem ntau yog siv rau kev sib xyaw cov cement, xuab zeb, ntau yam mortar qhuav thiab lwm yam khoom siv hauv tsev. Nyob rau hauv lub tov khoom, ib tug ncej nrog cov hniav rotates nyob rau hauv ib lub tog raj kheej los yog trough kom sib tov ntau yam khoom xyaw rau hauv ib tug sib tov.