Abstract: An automatic nailing machine for fabricating wooden pallets. The device has a hammer pin support bar vertically movable within a frame and horizontally aligned by a first horizontal alignment bar mounted on the frame. A nail feed and support bar is mounted below the hammer pin support bar, is moved upwardly when the hammer pin support bar is moved to its uppermost position, moves downwardly with said hammer pin support bar when said hammer pin support bar begins its downward travel and then remains stationary as the hammer pin support bar continues its downward movement. A plurality of hammer pins are mounted on the hammer pin support bar and cooperate with a plurality of nail holding devices mounted on the nail feed and support bar. The nail feed and support bar is horizontally aligned by a bar affixed to the frame and lined to the nail feed and support bar.