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a
Excessive torsional vibrations can cause meshing gears to loose contact and re-engage
with considerable energy--impact, resulting in "hammering" which creates annoying noise emanating from the gearbox and
ultimately leading to failure of the gears. In the figure above, vibratory torque between meshing gears is superimposed
on mean transmitted torque and shows the likelihood of hammering occurring at 1,200 rpm.
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