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Originally Posted by TechnocratiK
For some reason, everyone on my team complains to me that the term "coolant" is preferred over "lubricant" (but I can't imagine why). Anyway, the coolant we use is ESSO Cutwell (I can't remember which kind - 40 or 45 maybe?), which can be bought in 4-litre bottles and is usually dissolved in water before use, meaning that one purchase should last at least a whole season.
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well technically a good "lubricant" would keep you from cutting in as the drill bit's edge would only slide across the surface. a coolant keeps the tip cool