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Speed percentage problem

Speed percentage problem.

A drilling speed should be set to
400 rev/min. The nearest speed available on the machine is 412 rev/min. Calculate the percentage of over-speed.

Solution:

Percentage of over speed= available speed-correct speed/correct speed × 100%

= 412-400/400 ×100%

= 12/400 × 100% = 3%

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