A conveyor with juxtaposed blocks moves along a path of travel, certain of the blocks have recesses which receive second joints of the wings of poultry. The second joints are arranged sidewise to the path of travel of the conveyor, in the recesses and are successively passed beneath a support frame where a hold down plate and knife is reciprocated as the support frame is towed by the conveyor to cut the flesh and skin between the ulna and radius bones and one or both cartilages, which join the ends of the bones. When cutting a cartilage, the bones are urged apart as the cut is made.