> How about using a radiator like
> https://www.amazon.com/Computer-Radiator-Water-Cooling-Cooler/dp/B079D
> HJ91F/ which is intended to cool CPUs? It comes with mountings for
> three 120mm muffin fans.

I have a similar radiator for the laser, but the 80W laser produces
approximately 800W of waste heat and I wanted to be able to use it all day.

I think a radiator is needless expense and complexity for a small
spindle motor.  I have the 2.2 KW spindle on the larger CNC router and
the coolant starts to become slightly warm after running it constantly
for several hours.  Given that the heat transfer rate out of the coolant
tank increases as the coolant temperature increases, I doubt I could
overheat the coolant system running it nonstop, even with a high
temperature ambient environment.  The spindle motor is probably too
efficient for that to happen.  If I wanted to run it full time and
cooling did become an issue, I'd probably add a second five gallon cat
litter bucket cooling tank (free) and another 4 gallons of RV antifreeze
(US$10).  If space was at a premium, I still wouldn't be tempted to use
even the smaller single 120mm fan radiator to avoid adding more series
plumbed coolant tanks.  I'd be concerned about leaks and galvanic
corrosion and a fan failure.  I'd just get a 50 foot length of tubing
and toss the coil on top of the machine enclosure to make a passive
radiator.  The thermal conductivity of plastic tubing is lousy, but it's
easy and cheap to compensate with a lot of surface area, and I like the
simplicity - just a longer piece of the tubing I'd already be using with
no welded aluminum radiator, no fan, and nothing to leak or break.

I wired my coolant pump into the machine power.  The low power pump runs
as long as the machine is powered.  That seemed inherently safer and a
lot easier than having the pump under software control.

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