Protecting Bearings Using Specialty Coatings

As we’ve mentioned before, electric motors account for a majority of power usage in the US industrial sector and when they invariably fail, bearings are usually the main culprit.

Protecting the bearings on electric motors would, logically, help prolong the operation life of a motor. One solution would be using grounding brushes to prevent shaft currents or contamination from damaging the bearings. Another solution would be to use coated bearings. Writing at Design News, Daniel Juchniewicz, an applications engineer for MBP Bearings, suggests coated bearings could be the antidote for many bearing related problems.

Juchniewicz provides three areas where specialty coatings would benefit bearings:

1.Delivering wear resistance
2.Insulating against electric currents
3.Turning to wind turbine reliability

Delivering wear resistance

Bearings can be prone to wear for any number of reasons, whether due to poor lubrication conditions (associated with high temperatures and/or low lubricant viscosities), sudden variations in load or speed, standstill vibration, and/or particle or liquid contaminants. All can dramatically shorten bearing (and equipment) service Cylindrical Roller Bearing Dealers India life over time.

Insulating against electric currents

Variable frequency drives (VFDs) provide many benefits when properly installed to manage motor functions, however they also create a potential hazard: shaft currents. Currents generated by a VFD pass along the motor’s shaft and, if correctly installed, go to ground. However, if there are no other options, the current may use the bearings as its path to ground. The resulting damage to the bearings from electric arc aren’t the only hazard to the health of the bearing.

Turning to wind turbine reliability

One of the more challenging applications for bearings, Juchniewicz writes, are wind turbine systems. Varying temperatures, speeds, and loads continually test the bearings while the turbine is in service. In addition, the bearings will also have to withstand contaminants, moisture, and chemicals, which pose direct threats to the life-cycle of the bearings and effect turbine operation and maintenance costs.

Because of the multitude of conditions in which bearings operate, your mileage may vary when using specialty coated bearings. However, regardless of your bearing application, consulting with experts is a very important first step.

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Explorer class bearings promise faster speeds & improved reliability

Explorer high-performance, long-life bearings range now includes an improved single-row angular contact ball bearing that delivers a number of benefits for designers and operators of screw compressors, pumps, and gearboxes seeking to reduce the total cost of ownership of this equipment through improved reliability and energy efficiency.

Featuring a redesigned brass cage that delivers reduced noise and vibration levels and improved robustness, the new 40° contact angle bearings significantly increase the limiting speed up to 30 % compared to the previous design.

The new cage geometry and the use of stronger brass material reduce cage contact forces and increase cage strength, ensuring greater tolerance of shock loads and vibration, while delivering the significantly higher speed capability even under severe operating conditions.

In addition to the redesigned 40° contact angle, a new contact angle of 25° is also offered, giving the bearing a further 20% increase in speed over that of the 40° version, while enabling higher radial loads to be accommodated. In each case, the ball-to-cage contact arrangement allows cooler running and greater temperature stability, while noise and vibration levels are reduced by 15% in both the 40° and 25° versions.

Sealed variants of these bearings are also available for applications that may be more difficult to maintain, preventing contaminants from entering the bearing during installation and subsequent operation. Bearing arrangements that include a 40° contact angle unit taking the main load with a 25° unit acting as a back-up bearing offer improved robustness for applications where the axial load is predominantly in one direction, resulting in longer service life.

Explorer class bearings are the result of years of development and accrued expertise in bearing design, tribology, metallurgy, lubrication and machining techniques. The new 40° and 25° Explorer class single row angular contact ball bearings are an attractive option for operators of screw compressors, pumps and gearboxes seeking cooler running, more energy efficient and longer life bearings that will ultimately set their products apart from the competition.

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What Drives Capital Hill Cashgate Scandal Corruption In Malawi And Why It Won’t Disappear Soon

It is now two years since Malawi was rocked by its biggest government corruption scandal in history. The systematic looting of public coffers by civil servants, private contractors and politicians saw them steal US$31 million from government coffers.

It is estimated that about 35% of government funds have been stolen over the past decade. The impoverished country’s national budget for 2013-14 was about US$1.3 billion (630.5 billion Kwachas) at today’s exchange rate.

But has the country learnt anything from its biggest scandal that saw donors withdraw support?

The University of Malawi’s Blessings Chinsinga recently pointed out that:

… efforts to root out corruption do not stick because the existing institutional milieu makes it almost impossible to introduce changes that can effectively stamp out corruption.
The observation is instructive in that the scandal spans two political administrations. Malawi was led by the late president Bingu wa Mutharika in 2004 and the scandal unravelled on the watch of Bingu wa Mutharika in 2013.

Fertile ground for corruption

A number of factors contribute to the current state of affairs.

There is no clear distinction between a party in power and government activities in Malawi, unlike in established democracies. In Malawi, the party in power is the de facto government.

In Malawi, a party in power calls itself boma (a government). Ordinary Malawians look at abuse of state resources by those in power as acceptable. It is almost impossible to tell a party in power from the government.

Even more serious is the fact that political parties in Malawi are not mandated to declare their sources of funding. This breeds corruption and fosters abuse of public resources. This is not unique to Malawi. But in countries like Botswana, hailed as one of the model democracies on the continent, they at least have a debate on political party funding. Debates are also taking place in Nigeria and South Africa, respectively the continent’s largest and second-largest economies.

Another contributing factor is that after 21 years of multiparty democracy, governance in Malawi remains heavily centralised. Although the country has been independent since 1964, it only became a democracy in 1994.

Until then, it had been a one-party state decreed by its first post-colonial leader Kamuzu Banda, who banned political parties. He became president for life in 1971. Since 1994, the country has had local government representation for only six years – from 1999 to 2004 and from 2014 to now.

The central government has been reluctant to relinquish some of its powers. The president makes even the smallest of decisions and undertakes mundane tasks that should be reserved for line ministries. This encourages a system of patronage.

Lastly, government contracts, tenders and board memberships all go to sympathisers of the party in power and not necessarily to the best bidder or the most competent applicant. Government sympathisers or ruling party members get contracts regardless of their levels of competence.

This unfairly benefits the incumbents and weakens opposition parties. Businesspeople are afraid of funding opposition parties because they could lose state contracts and other business opportunities.

Scale and depth of corruption exposed

Malawians have always known that corruption is rife in the country. But the sheer size of the Cashgate scandal, both in terms of the amount and the wide number of people involved, has shown how deeply rooted the problem is.

The involvement of the country’s political class in the scandal is in stark contradiction to their penchant for standing on political campaign podiums promising to fight corruption with all their might.

Most of the people implicated in the Cashgate scandal were either members of the then-ruling People’s Party or its sympathisers.

There is an unwritten rule in Malawi that successful businesspeople align themselves with the governing party in order to protect their property and gain more contracts.

An aunt of Oswald Lutepo, thus far the main Cashgate convict and serving 11 years in jail, was heard in court lamenting that her nephew was advised that he did not need to join politics as he was already a successful businessman and multimillionaire. At the time of his arrest Lutepo was deputy director of recruitment in the People’s Party.

The aunt’s lament is instructive: people join politics in Malawi mainly to make money. In terms of this logic, the 37-year-old Lutepo was already a millionaire. He should have stayed out of it.

But he could not escape the lure of more riches that flow from being close to those in power. He knew the unwritten rule for success in Malawi only too well:

If you are unsuccessful, support the ruling party because this is where opportunities are.
Malawi is still learning to cope without support from donors and the jury is still out on whether it has learnt anything from its biggest scandal. A recent article in African Arguments underlines the hopeless feeling that Cashgate has left among most Malawians:

Malawi’s self-enriching officials need to know they will be judged not just by an imperfect judicial system, but by generation upon future generation of their compatriots.

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Certified to teach abroad? Now, let’s talk etiquette.

You’ve earned your certification to teach a second language and you’ve probably spent countless hours mulling over where you want to go and why. Do you want to immerse yourself in a new culture? Meet new people? Make money? Whatever the driving force, teaching a second language allows the freedom to explore another part of the world that may not have been possible otherwise.



As someone who lives in Canada, odds are you’ve mastered one of two languages, English or French. Either language will open up doors for you to teach across the globe. If you want to teach English in French-speaking country, it certainly helps to have a firm grasp on the French language to help you communicate with staff and students. Experiencing new cultures, discovering those hidden gems in a bustling metropolis or small rural town, comes with some responsibility. Wherever you plan on teaching it comes with its own set of social customs and etiquette that you will need to know. When a simple hand gesture can be a sign of thanks in one culture and a sign of disrespect in another, a couple of Google searches can save you a lot of embarrassment.



When you’re fresh off the plane and navigating your way to your new home away from home, you’ll undoubtedly feel that sense of “culture shock.” Getting used to your surroundings will be made that much easier if you’ve done your research and prepared yourself.



Before that 16-hour plane ride, follow these general guidelines to help smooth your transition and make for a more enjoyable experience:



Hit up the travel section of your local library or bookstore. While the internet is a wealth of knowledge, you can’t guarantee the source of information is truthful or accurate depending on the source. A good guidebook on your country can be a valuable investment.
It may not be a prerequisite to know your host country’s official language, but learning as much as you can and applying it to your daily life can help you cope with your new surroundings. As a foundation, learn the proper way to greet someone formally or informally, how to say “thank you” or “no thank you” and maybe some of those basic phrases like “where is the bathroom?” Make sure you keep expanding your vocabulary as you go to not only make your life easier but to get more out of your experience.
Take note of your verbal tics and physical gestures that you do most often. Now seek out a list of dos and don’ts for your host city and see how you measure up. While this is easier said than done, if you make a regular habit of the don’ts, begin phasing them out or find an alternative that won’t offend. You’re bound to trip up, but if you put in the effort it will be appreciated.
You’re going to need to eat to live. Start looking into local cuisine and eating as many different recipes as you can. Dine out and practice cooking meals at home with the supplies you can find in your host country so you get a varied experience. Knowing what you like and what you don’t can save you some embarrassment at your local restaurant or from going hungry.
If you’re young or young at heart and planning to tackle the local nightlife, it is important you look into what that entails. You may be familiar with North American customs and know what does and doesn’t offend, but there can be a whole different set of rules in your host city when approaching someone for a dance or buying someone a drink.


Consider some of these cultural dos and don’ts:

Country: China
Do: Wave someone over to you with your palm down. Don’t point or use your finger as this is commonly used for dogs and would be considered rude. Think about this when running your classroom.
Don’t: Write anything in red ink unless it’s when you are correcting a student’s work. Red ink is used for letters of protest.
Country: Brazil
Do: Make eye contact with those around you, even when you are walking through the streets or on public transit. It’s considered normal and polite.
Don’t: Get too drunk. Brazilians do not get drunk often and do not respect people who drink too much.
Country: Spain
Do: Appearance is very important. Be sure to dress well for any occasion. Avoid flashy colours and keep in mind the state of your shoes, it’s the most important element of an outfit.
Don’t: Waste your food. It is better to say no when offered food than to leave it on your plate.for more info, check out avant career

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Mbp Bearings: Cylindrical Roller Bearings Supplier India

Cylindrical roller bearings offer excellent resistance to instantaneous overloads and shocks.They simplify assembly thanks to their detachable elements and allow, for certain types, axial displacement or low axial load, for other types.


Cages


The standard cage for these bearings is the polyamide cage which allows bearing operating temperatures of 120°C or 248°F (150° or 302°F peak). The standard cage for series 4 is in pressed steel. The machined brass cage is available on option. Large-dimension bearings are equipped with a machined brass cage. For special applications in which the synthetic material cage is unacceptable, a metal cage can be provided on request.


Capabilities

Loads and speeds


Cylindrical roller bearings are designed to


Withstand radial loads


Withstand moderate axial loads if the position of the shoulders on the rings allows them accept high speeds of rotation

Misalignment

Cylindrical roller bearings accept misalignment of about 0.06° thanks to the correction on the roller surface profile


About Mbp-Bearings


MBP BEARING is eminent manufacturer of a range of high-quality anti-friction Bearings. Our company maintains high standards of efficiency and assure clients that the offered products are highly dependable. For us, quality has always been an integral part and culture of our organization and stringent efforts are made to ensure that the customers get value for their money.Our Plant is certified to ISO 9001:2008. Moreover, we are backed by the services of experienced and highly skilled technocrats belonging to the field of manufacturing bearings, who use sophisticated modern Machinery & Equipment.

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How to Preload Ball Bearings

In the case of ball bearings, preload is often a misunderstood concept and overlooked by designers and bearing users alike.

One of the final steps in the bearing manufacturing process is the assembly of the individual bearing components: the outer ring, inner ring, balls and retainer (or ball separator). When the bearings are assembled, it is necessary to have a controlled amount of internal clearance, or looseness between the rings and balls. This is referred to as radial play in most bearing catalogs.

In certain applications, this internal clearance must be removed for a pair of bearings to operate properly. The application of an axial load across a pair of bearings – for the purpose of removing free internal clearances – is called preload.

Benefits of preloading ball bearings include:

- Rotational accuracy and precise shaft positioning
- Elimination or reduction of ball skidding
- Control and reduction of axial and radial deflection under applied load
- Noise reduction
- Load sharing between bearings

Preload is critical in most high-precision and high-speed applications, particularly where rotational and positional accuracy is required.

If, under operating conditions, a bearing has radial play this means that one bearing race can be moved radially and axially relative to the other. With rotation, this looseness translates into wobble or non-repetitive runout. This motion is unacceptable in applications such as machine tool spindles, electric motors, optical encoders, flow meters, and high-speed hand tools.

The application of axial preload forces the balls into contact with raceways, establishing a contact angle which causes the ball set to rotate in a uniform circumferential plane.

This tip has been provide by mbp bearings

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Top 5 Pro Clutch Importers in India

1. Durgabearings.com
Durga Bearings was established to be a one stop solution, offering world class bearings through partnering with leading manufacturers across the Globe.Since its inception in 1977, Our Founder Mr. M. P. Sultania set upon his dream in the form of Durga enterprises & he showed the seeds of leadership, hard-work & commitment.
http://www.durgabearings.com

2. Abxbearings.com
ABX is a warehouse stocking bearing, seal and power transmission component and equipment distributor. We carry frictionless bearings of all styles and dimensions.
http://www.abxbearings.com

 
3. ARB-Bearings.com
ARB Bearings is India’s leading bearing manufacturer company. The company was incorporated in 1990 and its headquartered at Delhi. It is run by professionals with over forty years of experience in the bearing industries.With in a short duration since inception, the company has carved a niche for itself in various segments ranging from automobiles to industrial machinery to household appliances.
http://arb-bearings.com/

4. asbbearings.com
American Sleeve Bearing continually strives to be the best sleeve bearing supplier/manufacturer in the world. ASB has a genuine concern about our customers’ needs and desires. We believe that by establishing a mutually beneficial relationship with our customers we can both continue to grow and prosper.
http://www.asbbearings.com/
 
5. Deinabearing.com
Established in 1999, Tianjin DeINA Bearing Sales Co.,Ltd, is a professional supplier of standand and special bearings and bearing units. Located in Tianjin, we stocks an impressive range of quality bearing products at competitive prices. Our products mainly include ball bearings, roller bearings, combined bearings, bearing units and so on. Besides, we are also one ofAuthorized Distributors of some World-famous Bearing Brand such as SKF, FAG, NSK, Timken and so on.
http://www.deinabearing.com

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