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 Reliability Magazine® Message Boards
 Alignment/Balancing/Vibration Forum
 Bird Centrifuge Planetary Gearboxes
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| Author | Topic: Bird Centrifuge Planetary Gearboxes |
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penman39 Member |
posted 10-08-2002 04:26 PM
   
Hi, Does anybody have any info on these gearboxes? They are a two-stage units. What do you look for vibration wise that'll clue you in to internal probelems. The only location to mount an accel. is to the torque pin which is attached to the first stage sun gear. Is oil analysis a good tool for detecting problems? Any firsthand input would be appreciated. If you can point me to another source, that is fine to. Thanks IP: Logged |
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Rich Pratt Member |
posted 10-09-2002 12:10 PM
I haven't tested any of the Bird Planetaries, but on the one's I have tested oil analysis was the most effective technology. On most planetaries the transmission path for the vibration has so many interfaces that good data is hard to get. You might try peakvue and at least trend it, but oil is definitely the technology of choice. Rich IP: Logged |
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RalphV Junior Member |
posted 10-09-2002 01:23 PM
As part of our overhaul we allways include inspecting and repairs as required to all the bird centifuges gear boxes. No mater what condition we find the gear box in it has never been a concern "vibration" wise. I think an oil analysis would be the only reasonable check as to the condition. Then you would have to make a decision as to "just" how much brass you would allow before calling for an overhaul. The amount(of suspended brass) we find in perfectly good (from an operation point of view) gear boxes varies considerably. Ralph V IP: Logged |
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Dan Harvey Member |
posted 10-10-2002 08:35 AM
I have no direct experience with planetary reducers but Jim Taylor's book The Gear Analysis Handbook (ISBN 0-9640517-1-0) has detailed information regarding the technical aspects of vibration analysis on planetary reducers. I also understand that Dudley's Gear Handbook is an excellent source, but I think it is out of print. I'm not sure, but I think that CSI's RBMWizard feature of RBMWare will calculate the fault frequencies for you. Remember that broken teeth will show up in the time domain better that the frequency domain. Good Luck, Danny Harvey IP: Logged |
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