In order to reduce the precession vibration and torsional vibration of the flexible coupling rotating at {TAIL ~ a high speed}, it is important to minimize the backlash at {HEAD ~ the meshing portion} of the gears 
In order to reduce the precession vibration and torsional vibration of the flexible coupling rotating at { TAIL ~ a high speed } , it is important to minimize the backlash at { HEAD ~ the meshing portion } of the gears
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH