how the heck did I miss that in your thread?!?! I've probably read it 5 times and it never clicked.
I'm not sure how effective it would be with my mist system since the liquid is barely moving, but now you have me thinking... ever used a jockey keg? copper tubing coiled up in a cooler full of Ice that the beer runs through which cools it between the keg and the tap.
5 gallon bucket
Pond pump
2' copper tubing
couple press on connectors
20' of 1/4" rubber tubing
5 gallons of water
I already have everything but the copper laying around.
wrap a few times around the spindle with the copper tubing with an aluminum mount, run rubber tubing from each end to the bucket under the table with a 110v wall switch to the pump.
the water will be pretty dang cold but since the system would only be switched on when the head is over heating from running 4000+ rpm for long runs it won't bother me to walk into the house and grab 2 ice cube trays if the water gets hot.
by god that sure seems like a great $50 solution. also gives one of the two pond pumps sitting on my shelf some purpose in life
big machines have water cooled spindles... so can little ones. I'll get started first thing in february and get some benchmark tests to see how effective it is. I think 5000 rpm for an hour and measure the heat ONLY at the head should be effective.