Abstract: An apparatus for deburring a cartridge inside and outside comprising a base plate having an upper surface and a lower surface adapted to be positioned on a work surface, an upstanding interior housing secured to the upper surface of the base plate interiorly at its edges to define therewithin a chamber, a motor located within the interior chamber with a power generating drive shaft extending therefrom to within the exterior chamber for rotation upon energization of the motor, a driven gear rotatable on a horizontal axis having external drive teeth on the periphery thereof, a pair of driven shafts mounted about parallel, horizontal axis above the motor and drive shaft and rotatably secured adjacent to their ends to the interior housing, a driven gear mounted on each driven shaft at a common elevation within the exterior housing above the motor and power shaft at laterally spaced locations, each driven gear being in driving engagement with the drive gear for counter rotating with respect to each other and a pai