In my reports, I usually use the common terms. Sometimes I will use upper/lower (U,L) instead of inboard/outboard if the local terminology is firmly established. So you have G1H, G3V, G7A, etc.įor vertical machines, instead of H,V I use compass points so you have MOE, MIS, etc. If there are only 3 shafts, I use 1,3,7 so that 1/2 is always the input shaft, and 7/8 is always the output shaft. I number the bearings on the input side (regardless of where the output is) as 1,3,5,7. The drive-side, input bearing is '1' and the opposite end of the input shaft is '2'. To me, MIH, POV, or FOA is "obvious" to anyone who has been in the vibe business for any length of time.įor gearboxes, I do something a little different. I use M,P,F,G for motor, pump, fan, gearbox. For horizontal machines I use H,V,A for horizontal, vertical, and axial. I consider the coupling, sheave, or input (gearboxes) end to be 'inboard'. The 'description' field is long enough that you can usually describe it well enough. With CSI, you are limited to 3 characters for the point designation, hence the need to be creative. One thing for sure, you better make sure everyone involved in repairing something knows what is what. "Output Drive End" would also be correct, but "Output Inboard" is more easily understood by me, I guess because of the years of collecting data while using this form of "speaking". I would say on your question above that the "bearing on a gearbox output shaft side" to me, assuming the word "shaft" means the side where the coupling is located, would be the "output inboard" in relation to the coupling. Some books from equipment manufactures use inboard as the one farthest from the coupling but I thing they are doing this because, like say a pump, they are referring to the inboard as being closet to the impellar. Inboard being closest to the coupling and outboard being farthest from the coupling. We finally got on the same page with the Inboard and outboard thing being related to the coupling. I had this problem when I started at a papermill years ago. For sake of discussion, what is the bearing on a gearbox output shaft side – inboard or outboard, drive end or non-drive end?įor sake of discussion, what is the bearing on a gearbox output shaft side – inboard or outboard, drive end or non-drive end? I was referring to the non-drive end bearing however, maintenance perceives inboard and outboard to the fan rotor and not the drive coupling. Most recently, I was discussing a vibration problem with maintenance on an overhung fan "outboard bearing". It gets more confusing when assigning inboard and outboard to gearbox intermediate shaft bearings. The terms "drive end" and "non-drive end" are more to the point but not as accepted as inboard and outboard. Being an "old school maintenance mechanic" my perception of inboard and outboard was directly related to the drive coupling. For all of us who speak the maintenance language, inboard and outboard is spoken quite frequently. I have never seen any technical literature or information that globally standardizes these terms either. I have been involved in maintenance for over 25 years and am amazed at how the terms "inboard" and "outboard" are perceived.
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