Thermocouples embedded in the tool weaken the tool and cause tool
failure during heavy cutting. Steel workpiece, 300 m/min surface
speed. Thermal movie on the left is 300 frames per second. Field
of view is about 1 mm wide. Visible light movie in the center is
10000 frames per second. Field of view is about 2 mm wide.
Camcorder movie on the right is 60 frames per second. Plot on the
bottom shows embedded thermocouple temperatures and a
once per revolution resolver signal. For more information, see
the NIST publication "Recent Experiments Assessing the
Uncertainty of Metal Cutting Temperature Measurements When Using
the NIST High-Speed Dual-Spectrum Optical System".