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Originally Posted by
Trotline
I know of people using water cooled spindles who rely on thermal mass, rather than a radiator. Basically, a pond or fountain pump recirculates water to the spindle from a full 5 gallon bucket. I'm told the bucket never gets particularly warm using a 2.2kw spindle for hours on end. Apparently there's enough heat loss in the lines and bucket to dissipate what's picked up at the spindle.
Luke
That's how I run my larger machine, just 5-6 litres of undiluted coolant in a tub to the side, using a very small pond pump. The coolant in the tub is in a cooler spot of the workshop that helps, but it barely gets much above ambient no matter whether the machines running 1 or 8 hours continuously.
cheers, Ian
It's rumoured that everytime someone buys a TB6560 based board, an engineer cries!