Coolant Foaming: Causes and Solutions in Deep Hole Drilling
Problem Description Foaming robs a high-pressure coolant system of its ability to evacuate chips. The air bubbles in foam take up volume that should be occupied by liquid coolant. I’ve watched a foaming system lose 35% of its chip-carrying capacity — the chips stopped flowing out of the bore and started packing. In deep hole drilling, where chip evacuation depends entirely on coolant flow, foaming is one of the most disruptive problems you can encounter. ...