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Mr. Forum:

Good morning, I would appreciate answering the following query:

Bearing condition monitoring has been implemented using the SKF Acceleration Envelope Table, this table depends on the shaft diameter and its speed; we have the case of an electric motor that operates at 1760 RPM and whose shaft diameter is 35 mm, the monitoring personnel have taken the following (shaft diameter between 50 mm and 300 mm and speed between 500 RPM and 1800 RPM of the SKF table) for monitoring, is it correct, because it only complies with the speed (1760 RPM) but does not comply with the diameter of the shaft which is 35 mm? (In the attached file you will find the table):

Kind regards and success.

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Tags: Ge, Acceleration Envelope Table

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I have not seen that table before, so I don't know the technical basis (any test data?) for its content and intended use. I would place greater importance on shaft speed affecting vibrations more than bearing size, like the OP statement. Frankly, I would not base a maintenance decision or action (other than lubrication) on this chart/table, since it represents only a small indicator of machine condition. There are very few distinctive and absolute machine condition indicators, so it is best to have more than one indicator and use good practical judgement!

Walt

RM
@Registered Member posted:

I have not seen that table before, so I don't know the technical basis (any test data?) for its content and intended use. I would place greater importance on shaft speed affecting vibrations more than bearing size, like the OP statement.

Walt

I would not expect much variation in vibration from 1760 to 1800 RPM except in the presence of a critical speed.

RM
@Registered Member posted:

SKF has mentioned in the past (if I remember) that this is extremely sensitive to sensor position and mounting. This requires faith in a technology that I do not have.

I've seen some case histories purported to support this. I wonder how many case histories do not support this. I have seen material supporting/promoting the use on fluid film bearings. ????

I know a place or two where they have one of those installed

RM

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