a downhole percussive tool is disclosed comprising an interior chamber and a piston element slidably sitting within the interior chamber forming two pressure chambers on either side . the piston element may slide back and forth within the interior chamber as drilling fluid is channeled into either pressure chamber . input channels supply drilling fluid into the pressure chambers and exit orifices release that fluid from the same . an exhaust orifice allows additional drilling fluid to release from the interior chamber . the amount of pressure maintained in either pressure chamber may be controlled by the size of the exiting orifices and exhaust orifices . in various embodiments , the percussive tool may form a downhole jack hammer or vibrator tool .