Use coolant on the advice of the tool manufacturer. I tend to favour dry roughing with carbide because of thermal shock and early degradation of the cutting edge due to that. It can be very difficult to get coolant flow right into the cutting zone, plus the tool goes into the shadow of the cutter body once per rev, so this is why I cut steels dry with carbide on the mill. On a shielded machine, an air blast is beneficial to keep the chips from accumulating near the cut zone.
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