Shop for Working Boards. Working Boards (WB) are dense and strong combining high quality with excellent mechanical properties. They require relatively slow machining speeds due to their high density. Working boards have a fine cell structure and surface texture, and are grain-free. They are easy to machine, designed for processing on CNC milling equipment, resist attack by parting agents, and are easy to bond with urethane, epoxy, and cyanoacrylate adhesives. RAKU® TOOL working boards are used for metal forming, hammer forms, casting facilities, molds, checking fixtures, and lay-up tools. Stocked products typically ship in 2-5 business days. Can’t find what you need? Get a quote.