a tool for machining a workpiece may comprise multiple parts that have different temperatures when the tool is being operated . to reduce or , in some cases , eliminate thermal radiation between the multiple parts , the tool may incorporate one or more devices that manipulate the thermal radiation . such devices may be disposed along one or more of the multiple parts and , in some examples , between two or more parts of the tool . these devices may also help reduce and , at times , eliminate thermal radiation between the tool parts and the surrounding environment .