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In industrial mixing, shaft design is one of the most critical—and often overlooked—factors in long-term equipment performance. At MIXCO – LOTUS MIXERS, proper shaft engineering is fundamental to delivering reliable, process-driven agitators. One key principle we emphasize is operating the shaft speed below 65% of its first critical speed. Understanding First Critical Speed The first critical speed is the rotational speed at which a shaft naturally resonates. At this point, e