so as not to overload the turbine generator 40 to that end the turbine generator 40 may include a power bleed off circuit including a resistor circuit to bleed off power on occasions the turbine generator 40 produces too much power with respect to the embodiments illustrated in fig4 6 the energy harvesting device 34 u2032 harvests energy from the rotational motion of the spindle 12 transmitted to a shaft 50 of the tool 14 u2032 and tool holder 16 u2032 as shown the tool includes a housing 52 with a stop 55 for attachment to a stationary part of the spindle 12 not shown bearings 54 are disposed between the shaft 50 and the housing 52 so that the housing 52 remains stationary as the tool holder 16 u2032 and shaft 50 rotate similar configuration including a stationary housing and stop feature may be found on milling tools that include right angle heads that are well known to those skilled in the art as shown a generator 58 is mounted to the housing 52 the generator 58 is operatively connected to the rotating shaft 50 via a belt and pulley mechanism 60 thus when the shaft 50 rotates the generator 58 outputs power or electricity via electrical lines 62 to a work piece end including a sensor or tool as described above in the embodiment.