What is the meaning of drill speed?

Answer:
Drill speeds are almost always measured in revolutions per minute, RPM or revolutions per second, RPS. This term means that the drill makes a complete revolution that many times in the specified time period. 7200 RPM means that it will revolve 7200 times in a minute, or 120 times in a second. Some materials require specific drill speeds in order not to damage them. The limits are usually on the maximum speed.
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