Abstract: A nailing machine is utilized in conjunction with particular conveying apparatus and an associated processing system to nail deck boards to stringer beams transversely thereof so as to manufacture either single or double deck wooden pallets. Conveyors are mounted on either side of the nailing machine in such a way as to permit contact elements thereon to readily engage the lead stringer beam of either single or double deck pallets under construction and index them forwardly to predetermined positions where additional stringer beams are nailed in place to deck boards.For making double deck pallets, half pallets having a first deck thereon are side fed with their stringer beams up into an input position on the input side of a nailing machine adjacent to a deck board hopper. A single pusher operates to simultaneously deliver a second set of deck boards from the hopper and a half pallet from its input position into the nailing machine for the nailing of the second set of deck boards in place.