In our spindles on our Horizontal etc they use Oil as the cooling , with
a chiller that chills it right now to aset point to keep it at a
constant temp. , this is put through the motor and the spindle to stop
any thermal grouth transmitted and also cool motor instead of forced air.
i think its something like ISO 10/15 grade oil
i know oil is not as good at transmitting heat than water etc but at
least it does not rust or clug things so easy over time. must be why
they run it at amuch lower temp than expsected..
plus for hobby use you would need a chiller and not just a pump and rad..
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