Coolant is NOT always a "must" with carbide tooling. Depending on the operation, if coolant is not applied directly to the cutting edge...of every cutting edge on the tool, coolant will harm tool life by creating thermal shock during the constant interrupted cut that milling creates. Do you think the guys who ball mill 65rc steel with solid carbide use flood coolant? No sir. Face milling? Nope. Sometimes it is useful to use coolant to flush chips away from the cutting zone or for ultra-fine finishes, or heat reduction. Proper tool selection, speeds, and feeds removes heat with the chips instead of putting the majority of it back into the part. |