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Common Questions on Bearing

What are bearing retainers/cages made of?

Post By: June 2, 2022 0 Comment

Bearing retainers, also known as bearing cages, are used in rotary and linear bearings to separate and maintain a certain distance between rolling elements, such as balls, needle rollers, and rollers. Bearing retainers aid in extending bearing lifespan by reducing wear between parts, reducing heat build-up, and reducing wear between elements.

Classification

There are two fundamental types of bearing cage designs in rotary bearings: crown and ribbon. Crown retainers have an open-ball pocket design with a single component. Ribbon retainers are made of two pieces with an open-ball pocket design.

To determine the right type of bearing retainers to utilise for a certain application, consult the bearing manufacturer. It should be noted, however, that bearings with retainers are not always appropriate. A full-complement bearing with no holding mechanism, for example, may be recommended in applications with moderate speeds and large loads. Choosing bearing retainers or bearing cages necessitates an examination of materials and product requirements.

Materials

Metals such as heat-treated aluminium, solid bronze, or pressed steel are used to make bearing retainers or bearing cages.

Non-metal materials such as nylon, PTFE, and phenolic resins are used in others. Steel that has been pressed is a popular option.

Brass cages are typically utilised in severe or corrosive situations because they offer acceptable noise characteristics.

For spindle bearings and machine tool applications, phenolic or fiber-resin cages are used.

These bearing cages, also known as bearing retainers, are relatively light and can resist high speeds and large loads.

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How is the bearing installed?

Post By: May 5, 2022 0 Comment

Because the procedure of mounting rolling bearings has such a big impact on their precision, longevity, and performance, it’s important to pay attention to it. Their characteristics must first be highly observed, and then they must be mounted correctly. The handling processes for bearings should be thoroughly researched by design engineers, and standards should be set, such as examining the dimensions and other associated components; bearings and associated parts should be clean; procedures for mounting; and sufficient lubricants.

The bearing mounting technique is determined by the kind of bearing and the type of fit. Bearings are typically used on rotating shafts, therefore the inner rings must fit snugly. Bearings with cylindrical are often placed on shafts by pushing them on (press fit) or heating them to enlarge their diameter (shrink fit). Tapered bore bearings can be placed directly on tapered shafts or cylindrical shafts utilising tapered sleeves.

Things should not be done while installing a bearing on a shaft.

  • Touching bearings with your bare hands is never a good idea. The use of talc-free finger cots or talc-free surgical gloves is recommended.

Now let’s talk about how the bearing is removed from the shaft. The bearing removal method is done with a bearing puller for standard outer and inner rings, which may be obtained from a variety of manufacturers, including FEIKEN. A puller that pulls through the rollers should be used to remove bearings with a backing shoulder placed on the bearing. It also applied the pressure which can cause the raceway to expand and be easily removed.

Things should not be done if removing a bearing from a shaft.

  • If you want to retain the housing and other parts unharmed, don’t use a torch.
  • Not cooling the bearing will cause the cases to shrink.
  • Never put aluminium parts on any type of hot plate. It’s nearly impossible to heat uniformly, and much more difficult to keep the temperature under control. The maximum temperature you can reach is 400 degrees Fahrenheit. 
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How to analyse bearing designation?

Post By: April 2, 2022 0 Comment

A bearing number is made up of many numbers that represent various characteristics of a bearing. A bearing number, in general, contains information on bearing types, bearing series, bore size, and sealing basic designation typically contains three to five digits.

The first digit of the bearing refers to the type of bearing.

The second digit identifies the bearing series.

The last two digits of the basic designation identify the size code of the bearing bore. The size code multiplied by 5 gives the bore diameter (d) in mm.

For instance, let’s take an example 6310. How can we know more about the bearing base on the number?

The first number, ‘6’ represents the bearing being a deep groove bearing.

The second digit ‘3’ bearing series refers to the bearing toughness, which is medium.

The last two digits represent the bore size of the bearing. We can get the diameter by multiplying by five to provide us with a clear diameter(d) in mm. This is one of the ways to identify one of the ball bearing sizes by looking at the designation code. So we can conclude that the inner diameter of the 6310 is 50 mm. In bearing number, the last digit or last second digit if it has 5 digits, can indicate the bearing size.

The table will help to identify types of bearings by number. Types of bearing and their codes.

Deep Groove Ball Bearing6
Cylindrical Roller BearingN
Tapered Roller Bearing32/T
Spherical Roller Bearing2

The table will help to identify types of bearing series toughness.

Extra Light0
Extra Light Thrust1
Light2
Medium3
Heavy4
Extra thin section8
Very thin section9

How do we find bearing numbers?

One of the simplest ways to find the bearing number is to look for designation numbers. They are often engraved on the bearing’s surface. However, if they have been employed for a long time, the designation number may be wiped away owing to wear. To know the designation number, we can take its inner diameter divided by five.

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How to measure ball bearing?

Post By: January 17, 2022 0 Comment

How to measure ball bearing?

The shaft size and application requirements specify the bearing size. Bearing size has a significant impact on the performance and capacity of a ball bearing. As a result, different sizes are used in different sectors.

Basically, smaller ball bearings have lower load capabilities, thus they are utilised in applications where space efficiency exceeds load capacity. Miniature bearings, which are often manufactured as precise ball bearings, are utilised in extremely small applications such as medical equipment, robotics, and semiconductor equipment. On the other hand, larger bearings have higher load capacities and are required in heavy-duty sectors including farm machinery, mining and drilling equipment, along with power tools.

FEIKEN Bearing will explain further in detail on how to measure the bearing size by using a vernier calliper. The vernier calliper can easily provide an accurate measurement for inner and outer bearing sizes.

  1. First, measure the inner diameter of the bearing by placing the calliper’s outer anvils into the inner ring. Check whether its only fitting is from edge to edge and not too tight or putting extreme pressure on the bearing.
  2. Place the bearing in the calliper jaws and measure the outside diameter until it fits precisely.
  3. Alternatively, both inner and outer can be measured using a ruler from one inner/outer edge to the other.
  4. Follow the previous procedure for the bearing’s width.
  5. Lastly, check the bearing series code on the bearing size chart based on the measurement attained.
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How does temperature affect bearing life?

Post By: January 5, 2022 0 Comment

How does temperature affect bearing life?

The temperature of the bearing rises as the rotational speed of the bearing rises, owing to heat buildup inside the bearing due to friction. This might cause a lot of damage to the bearing, such as seizure, and the bearing will be unable to keep operating in good condition.

The bearing life and performance will be inadequate if a bearing designed for operation at normal temperatures is employed in an exceptionally high or low temperature environment.

High temperatures can cause “bleed out,” which means grease from the bearings may start to flow away from important areas. Certain oils can evaporate or flash out at temperatures over 175 °C, which can damage the surface of the balls and raceways and eventually cause a bearing to fail. For every 15°C increase above 70°C, grease life is typically reduced by half. Meanwhile, low temperatures can cause higher lubricant viscosity that will produce higher torque and cause skidding.

Numerous mechanical and kinematic factors restrict the maximum speed of a ball bearing in operation. Narrow bearing and surrounding part tolerances, particular lubrication and lubricant type measures, as well as special retainer materials and designs, all have a major effect on the speed limit. For this reason, Feiken Bearing simply provides an idea of the ball bearing’s relative speed appropriateness. If your operating circumstances are different, please contact us for further information.

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What factors should you consider before choosing a bearing?

Post By: December 21, 2021 0 Comment

Factors to consider before choosing a bearing

How do you know which bearing type to utilise when there are so many? Mr. Wong Yi Tin, Director Manager of Feiken Bearing, will offer a brief overview of what constitutes effective bearing design. He concentrates on the fundamentals of bearing selection in this section. It might be difficult to know where to start with so many high-specialized bearing alternatives.

As a preliminary step, FEIKEN Bearing recommended this article.

Bearing Load

The bearing’s load capacity is the first aspect to consider since every type of bearing has its own load limit. For example, there are two types of loads which are axial load and radial load. Each type of bearing has been specifically designed to support both loads. In some cases, there are conditions where the bearing needs to support both loads. We recommend you use a tapered bearing as it is capable of handling both loads greatly.

Operating Speed

Each bearing has its own set of speed limitations, which have been determined by practical testing in a variety of applications. The allowed speed varies depending on the bearing size, type, load, lubrication, and temperature.

Size Limitation

The amount of space available for bearings is generally somewhat restricted. In many cases, the diameter of the shaft or bearing bore is determined by design conditions.  As an illustration, the bearing used in a dentist’s drill must clearly be much smaller than one used in an oil rig.

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How do lubricants reduce friction?

Post By: December 15, 2021 0 Comment

Material coating strategies to minimize friction have long been explored by design engineers. Could the reorganization of newly discovered materials minimize friction on macroscopic scales? 

FEIKEN Bearing will explain how lubricants can reduce the friction of bearings.

Bearing lubricant is necessary for effective bearing operation because it minimizes friction; if there is insufficient lubricant, it may cause bearing damage or failure, which eventually shortens the lifespan of a bearing.

Lubrication also prevents bearings and other wheel-end components from corrosion and pollutants that might harm them. Lubricants enhance the usable life of bearings to their maximum range when used correctly.

Wheel bearings can be damaged and fail over time due to contaminants such as water, salt, and organic waste.

Lubrication acts as a key barrier against these pollutants, ensuring that the bearing’s integrity is preserved. Leaking lubricant can let impurities into the bearing and cause failure if bearing seals become loose, pierced, or otherwise damaged by debris.

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