SHAFT ALIGNMENT TOLERANCES
SHAFT ALIGNMENT TOLERANCES
(OP)
The shipyard that builds our vessel is about to measure the shaft line alignment. As far as I know they are going to use Chinese standarts but I would like to know any international standardization about shaft alignments (Main engine + Gearbox + Shaft Alternator)
PS. Manufacturer does not give any reccomendation
Thanks
PS. Manufacturer does not give any reccomendation
Thanks
GOKHAN
Naval Arc.& Marine Eng.





RE: SHAFT ALIGNMENT TOLERANCES
Like in automotive applications it isn't real critical due to the use of universal joints.
To lessen the power losses and wear, the closer the better.
Especially if it is a solid connection, if it isn't real close then something has to take up the error. Bearings etc.
RE: SHAFT ALIGNMENT TOLERANCES
RE: SHAFT ALIGNMENT TOLERANCES
RE: SHAFT ALIGNMENT TOLERANCES
RE: SHAFT ALIGNMENT TOLERANCES
You can perform a shaft alignment calculation to see how the shaft will deflect, and what bearing reaction forces will exist (both in cold and warm condition). Usually, the gearbox manufacturer specifies allowable bearing loads due to alignment.
If you use a sag and gap method, you don't need any laser equipment.
RE: SHAFT ALIGNMENT TOLERANCES
Doing laser shaft alignment will ease you the burden in terms of time, in contrast with conventional dial indicators.
RE: SHAFT ALIGNMENT TOLERANCES
If any data is not provided by the manufacturer, try using EASA Mech'l Eng'g HAndbook as a reference since it suggest a tolerance value if the latter is not available. I been using this, whenever the suggested tolerance level of the equipment (OEM) is not available.