A method of producing a set of parts from a panel of material mountable on the worktable of a CNC machine suitably programmable to perform prescribed machining functions on such panel, generally consisting of programming the machine to perform a first set of machining functions on a first side of the panel and a second set of machining functions on an inverted side of the panel, mounting the panel on the worktable, operating the machine to perform the first set of machining functions on a first side of the panel, inverting the panel on the worktable and operating the machine to perform the second set of machine functions on the second, inverted side of the panel.