Extra Fan For Sieg X2

For my purposes (stress testing the power board) I generally run them at full power to test the board's overload circuits, and check for heating of the components (The motor is just a means to test the board and is connected with an XL belt/pulley to a second motor used as a variable load). I can usually make the motor too hot to touch after only 2-3 minutes without the heat sink attached and it takes quite a bit of time to cool. With the heat sink I can run for 5+ minutes or so. I would suspect a CNC configuration with a large(shell) mill would do the same thing.
 
2-3 minutes? wow, that heat sink must be doing it's job well then, I had read a few posts about these motor overheating but usually a fan would remedy the occasional shut down , your case is different, thank you for explaining how you do it.
 
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