Both, the part comes off cool as does the tool. Surface finish is excellent
Tool life is also excellent
I turn mainly aluminium

I dried it dry first and got pick up on the tools and poor surface finish. Then tried a brush and coolant and was much better but I didn’t like the idea of being there with the brush and coolant all the time so devised the drip method with the peri pump
Pump on off is controlled under gcode from linuxcnc but speed of pump rotation is on a manual control knob. 90% of the time it is in one position but I do turn it up for parting operations

Paul


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