Yeah, watch some CNC videos on youtube or whatever! The (usually blue) liquid spraying everywhere is coolant. Fancier machines will have a hollow spindle and c

Yeah, watch some CNC videos on youtube or whatever! The (usually blue) liquid spraying everywhere is coolant. Fancier machines will have a hollow spindle and can actually force the coolant through an also-hollow tool, so it emerges right near the cutting face. The simpler approach just uses a nozzle pointed in the general direction of the cutter. In between, there are programmable nozzles....