Hollow zeb
Hollow milling cutters, feem ntau hu ua tsuas hollow mills , yog tseem zoo "hauv-tawm endmills". Lawv zoo li ib daig ntawm cov yeeb nkab (tab sis nrog cov phab ntsa tuab), nrog lawv cov npoo ntawm sab hauv. Lawv siv cov turret lathes thiab cov cav siv ntsia hlau ua lwm txoj hauv kev xa nrog lub thawv rau khoom , los yog milling cov cav tov los yog xyaum ua haujlwm kom tiav ib tus kws cylindrical (xws li lub trunnion ).
