What fluid do you use, and do you have problems with mess/residue?Apparently not that common / generally overlooked, but a very capable solution is MQL (minimum quantity lubrication) as it gives the greasing ability of the coolant without the thermal shock problem. The air is enriched with oil mist and sprayed on / through the tool. Best if your tool or at least the holder is capable of through coolant/air. And yes, i am aware of the risks in regards to explosive atmospheres. Please make sure you buy a system that uses less then 20ml/h or install a fire suppression system. This is not a small shop solution but very capable if you have the volume to make the investment viable.
We are running 3 mid sized horizontals with 42CrMo4 with 44-48 HRC parts. Tool life is double compared to same application with coolant.