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In This Issue
| - Sight Gauge Simplifies Inspection
- Sampling is Key to Oil Analysis Accuracy
- Wear Metal Detection Methods
- Determining Lubricant Film Thickness
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| Sight Gauge Simplifies Inspection |
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| Consider adding a vertical sight gauge to critical gearboxes that are not fitted with a dipstick or a sight glass. Fitting a sight gauge allows the oil to be checked on the run and can indicate the oil level even if the gearbox is mounted in an unusual orientation. Fit the gauge to a low point (preferably the drain) and not the level plug. Also, mark the static level and running level on the gauge. Make sure the gearbox has a breather. Otherwise, a partial vacuum could be created, giving a false reading. (Andy Monk, Lubrisolve Engineering Solutions)
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Machinery Lubrication training.
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| Many people regard drawing oil samples as an "as time allows" activity and fail to reap the benefits this technology has to offer. It should be taken seriously and be performed with the utmost care and diligence. It is not enough to simply fill a bottle with oil from the system; you must perform this task properly to accurately trend the data you receive back from the lab. |
FULL STORY
Question: What are the two wear metal detection methods employed in oil analysis?
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From "Grease Lubrication in Rolling Bearings":
During most of its operational time, grease-lubricated rolling bearings are running under starved lubrication conditions. This means that the lubricant film thickness is primarily determined by the lubricant layer thickness in the running tracks. This layer thickness is determined by a flow balance. Lubricant flows outside the track by side flow due to overrolling by the rolling elements with a high pressure, but the layer thickness is also affected by flow due to centrifugal effects, cage scraping, evaporation, occasional oil droplets or grease lumps thrown off from the seals/cage/inner ring, oil bleeding, gravity, surface tension and/or air flow. |
Read more about "Grease Lubrication in Rolling Bearings"
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