WHILE FLOOD AND THROUGH-COOLANT ARE THE MOST prevalent methods of delivering cutting fluid to a workpiece, another method exists-minimum quantity lubrication, or MQL, in which lubricant is measured in drops, not gallons. "The aim of a coolant, essentially, is to use a high quantity of liquid to transfer the heat away from the tool and the workpiece," said Tim Walker, senior vice president of MQL equipment and fluid manufacturer Unist Inc., Grand Rapids, Mich. "We simply try not to generate as much heat in the first place."
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