A fan and shaft are sent to a shop for bearing replacement. The shop balances the fan

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A fan and shaft are sent to a shop for bearing replacement. The shop balances the fan in a hard bearing machine operating at 450 rpm. The fan is high speed, being directly driven in the field by a motor at 3,600 rpm. The field engineer has cautioned the shop foreman to paint the final balance weight with red paint. Why?

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