A system for automatically attaching a flanging material to the edges of a panel such as for a mattress, including a work table on which the panel is supported and a sewing assembly having a sewing machine located along a path of travel of the panel across the work table. The flanging material is fed from a supply of flanging material located adjacent the sewing assembly, and is attached to the side edges and about the corners of the panel by the sewing machine of the sewing assembly. A clamp mechanism engages and holds the panel as the sewing machine of the sewing assembly attaches the flanging material about the corners of the panel.