A lathe or other rotating machine includes a tool rest on a carriage that is movable along the work piece. The carriage includes a post that is movable with the tool rest. The post supports a guard that is disposed between the user and the work piece. The guard may include a frame surrounding a transparent portion. The frame may support a plurality of light emitting elements directed onto the work piece. An extendable/retractable transparent portion may be extended from the guard between the user and the work piece. The extendable/retractable portion and/or the transparent portion may be a magnifier.