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Below are general RPMs for core bits running at optimum performance levels. Levels may vary depending on the manufacturer. It is important to note that running core bits at faster RPMs isn’t always necessary. When diamond tools exceed their recommended speed, the diamonds tend to glaze over, and the tool fails to work properly. Core bits can often be redressed using a conditioning stick to fix this. The same rule applies when using water. Excessive amounts of water can cause the tool to work at a less-than-optimal level.