#machine_tool__machinetool  a powered machine for cutting or shaping or finishing metals or other materials
  supertype:  machine  any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
  subtype:  grinder  a machine tool that polishes metal
  subtype:  shaping_machine__shaper  a machine tool for shaping metal or wood
     subtype:  lathe  machine tool for shaping metal or wood; the workpiece turns about a horizontal axis against a fixed tool
        subtype:  bench_lathe__benchlathe  lathe mounted on a workbench
     subtype:  milling_machine__millingmachine__miller  machine tool in which metal that is secured to a carriage is fed against rotating cutters that shape it

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