This machine is special design for metal hinge polishing, easy operation, save manpower, need only two workers, one worker put the hinge to the inlet one by one, hinges transfer to polishing position automatically, then polishing all steps idiomatically, finished products come out from the other outlet side. Production all in one time, working capacity is ten times higher compared with traditional manual polishing machine ,with speed of  1800-2000pcs per hour.