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Practical Solutions to Machinery and Maintenance Vibration Problems

Chapter 5, Unbalance

Section 21, Setscrew Tightening Order

For setscrews located 90° apart, the sequence in tightening at the balancing machine may not be the same as at final assembly (especially for fans and blowers). The balancing machine operator should mark which screws were tightened first so that the same sequence is followed by the assembler. This seems easy on paper, but it is very difficult to change old habits. Normally, these simple steps require a demonstration on the balancing machine. After that, proper instruction and enforced followup is necessary by the supervisors.

 

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