Linearguide

To calculate grease quantity, needs the bearing’s physical dimensions (primarily the outside diameter and width). The product of these measurements (in inches), has to multiply by 0.114, the resulting answer is the grease quantity in ounces. For the grease quantity in grams uses metric measurements and multiplies by 0.005 instead of 0.114. The result will be grease quantity in grams.

Temperature  Ft = 1.0 for under 70°C, divide by two for every 10°C above 70°C (e.g. 0.25 for 90°C) Contamination Fc = 0.1 to 1.0 depending on the level of contamination. For light non-abrasive dust (motor bearings) 1.0 Moisture Fm = 1 for Humidity below 80% and 0.1 for occasional water on housing Vibration Fv = 1 for less than 0.2 ips and 0.3 for above 0.4 ips (inches per Sec) Position Fp = 1 for Horizontal centre line, 0.5 for 45 degree bore centre line, 0.3 for vertical centerline. Bearing Type (Design) Fd = 1.0 for spherical or thrust bearing, 5.0 for cylindrical bearing, 10.0 for ball bearing

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How often to apply that amount of grease. This timeframe is known as the regreasing frequency. This calculation is more complex. The machine’s operating conditions must be considered along with some additional bearing information. Factors that affect the regreasing frequency include: temperature, continuity of service, quantity of grease in housing, size and speed of bearing, vibration, exposure to contaminants, effectiveness of seals and the grease’s suitability for the particular service.

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30 to 35% of the lubrication surface is the recomended volume of grease... over greasing will result to lubrication failure...

How much grease? (Regreasing quantity) and how often do I grease? (Regreasing frequency) are the most common questions where applications lubricating with grease. Some applications, such as double sealed bearings in electric motors, do not require regreasing at-all, but most others should be relubricated. Applications are required periodically regreasing to replace grease that has deteriorated, leaked away, or become contaminated.

Excellence technical information, over greasing will affect to rising operating temperature, every 10-degree Celsius the temperature increase from the normal operating temp will damage 50% of lube oil properties.

K –Product of correcting factor (Temperature Ft, Contamination Fc, Moisture Fm, Vibration Fv, Position Fp, Bearing Design Fd)

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Bearing’s physical position and vibration will also affect the grease’s run-out and frequency of reapplication. If the bearing is mounted on a vertical shaft, the grease has a tendency to run out of the bearing quicker, thus needs to be replenished more often. When the bearing is subjected to vibration, it causes the oil in the grease to separate from the thickener, allowing it to drain away from where it is needed much faster.

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Bearing or equipment manufacturers recommend relubrication intervals based on operating conditions and type of grease. For example, typically, light to medium duty electric motors, that run continuously, will require at least annual relubrication. However, high temperatures, continuous service, high speeds and vibration are all factors that increase the required frequency of relubrication.

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The ambient contamination (how dusty the environment is) and moisture (how humid the environment is) work in a similar manner. The dirtier and wetter the environment, the more often the bearing must be regreased.

Bearing element shape is important because each different element stresses the grease differently. A ball rolling across the race churns the grease differently than a spherical element, which churns the grease much more heavily.

Undergreasing can cause metal-to-metal contact and equipment wear, as a result of inadequate lubricant delivery in contact zones. Overgreasing can cause overheating, seal damage, energy losses and oil bleed due to grease churn.

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This is only for general guidance and actual Greasing is based on Industry Expertise and Manufactures Recommendations for the specific application.

A commonly used thumb rule dictates that the relubrication interval should be reduced by half for every 10°C above the nominally recommended temperatures.

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