yankee gear box
yankee gear box
(OP)
Hi to everyone, this is my problem on a paper machine.
This is the part of machine that I have measured
cardan shaft
Motor 1---------------
gear box-------Yankee
Motor 2---------------
I have measured an high vibration on a Yankee's gearbox (17 mm/s RMS in radial direction and 7 mm/s RMS in axial direction), the spectra show only one peak of vibration at 1xRPM of the entry shaft, an the time domain is sinusoidal (for radial and axial). I have only a measurament and I don't know if the high vibrations are present at higer speed, but i know that the cardan shaft are new.
Have you some suggest to give me?
Thank you.
Andrea
This is the part of machine that I have measured
cardan shaft
Motor 1---------------
gear box-------Yankee
Motor 2---------------
I have measured an high vibration on a Yankee's gearbox (17 mm/s RMS in radial direction and 7 mm/s RMS in axial direction), the spectra show only one peak of vibration at 1xRPM of the entry shaft, an the time domain is sinusoidal (for radial and axial). I have only a measurament and I don't know if the high vibrations are present at higer speed, but i know that the cardan shaft are new.
Have you some suggest to give me?
Thank you.
Andrea





RE: yankee gear box
If more than one are they in phase, aligned?
How are the shafts coupled to the gearbox?
What is the speed of the input shaft?
What is the centerline offset of the input shaft?
Come back with a little more information
RE: yankee gear box
I have seen exactly the same vibration on a paper machine drive with the same layout as yours and it was caused by misalignment of one of the carden shafts. Carden shafts are extremely sensitive to alignment and they do give high vibration levels if not aligned very carefully.
Ron Frend
tel: 011 44 1253 400541
ron.frend@predicon.net
http://www.predicon.net
RE: yankee gear box
you can look for:
bent shaft
unbalanced shaft
excessive coupling runout
oversize yokes
all on "new" driveshafts; quality control particularly with new Dana shafts is haphazard at best.
RE: yankee gear box
I've had cars that I couldn't balance due to this.
Cheers
Greg Locock