Device for detecting a thermal linear dilation on part of a machine

A machine tool comprising:

• a movable tool spaced from a workpiece;
• an arm that receives heat from said movable tool and changes a distance between said movable tool and said workpiece;
• a device for detecting thermally caused linear expansions of the arm, said device comprising:
• a temperature sensor placed along an expansion direction, said temperature sensor comprising:
• a first metallic conductor having an electrical resistance that is proportional to an average temperature of an area to be monitored;
• a plurality of trimmer tracks in the form of further metallic conductors placed next to said first metallic conductor;
• electrical switch connections selectively interconnecting said plurality of trimmer tracks with said first metallic conductor for selectively adjusting an effective resistance of said plurality of trimmer tracks, and
• wherein the effective electrical resistance of said plurality of said trimmer tracks is proportional to said average temperature of said area to be monitored.