Abstract: Apparatus for processing the margins of work, both circular and non-circular, has a rotatable work holder provided with a clamping member to clamp work against a template. The processing is typically that of bringing the work to the size and shape established by the template and is effected by at least one tool. The disclosed apparatus has a pair of tools, both rotatable and each having a different function and the tools and their drive are carried by structure provided with means to reciprocate it between an inoperative position and a position in which the tools are in engagement with the periphery of the work. When the work is non-circular, the work holder and its drive so turn the work that its periphery advances into contact with the tools at a controlled rate.