Archive for May, 2011

DIFFERENT CAGES FOR DIFFERENT BEARING NEEDS… (Part 1)

Tuesday, May 31st, 2011

Cages (sometimes referred to as rolling element separators or retainers) perform an important function in the proper operation of rolling bearings. They serve to maintain uniform rolling element spacing in the races of the inner and outer rings of the bearings as the rolling elements pass in and out of load zones. Cage types in several materials and configurations have been developed to meet various service requirements.

Some of the materials from which cages are made include pressed-steel, pressed-bronze, cast bronze, machined bronze, machined steel and compositions of various synthetic materials.

STEEL CAGES

Steel cages are generally ball-piloted and are available in the following types:

PRESSED-STEEL FINGER TYPE CAGES (SR)

Light in weight and made from strong, cold rolled steel, the pressed-steel cage because of its compactness is the optimum design for use in shielded and sealed bearings which must conform to the ABEC boundary dimensions. This is a general purpose design and is frequently used for ABEC-1 radial ball bearing sizes.

WELDED STEEL CAGES (WR)

The welded steel cage provides greater strength, increased rigidity, and better pocket alignment than the finger type. The projection welding of the cage halves eliminates weakening notches or holes and fingers or rivets. It assures better mating of cage halves circumferentially and radially.

This construction also provides more uniformity of ball to pocket clearance. Improved pocket geometry permits higher speeds, reduces cage wear, provides cooler operation, and improves and extends lubricant life. This cage is standard in most radial non-filling slot bearings of the open, shielded, and sealed types.

Stay tuned for part 2 … Molded Cages

Wish you a happy Memorial Day weekend!

Friday, May 27th, 2011

We at Bearings Incorporated would like to wish you and yours a wonderful Memorial day weekend!

Remember the real reason for the holiday….

It’s LAWN MOWER season again… So we are putting our Lawn Mower Deck Bearings on sale ….

Thursday, May 26th, 2011

….. until June 30, 2011

Timken brand lawn mower deck bearings, reference number 204RR6 A4362 are known as Farm Radial Specials.  The bearing dimensions are as follows:  .75 ID x 1.7805 OD and .610 width.

These bearings are a heavy duty radial ball bearing designed for use in the spindle housing of commercial and riding lawn mowers, commonly used in applications of John Deere Mower Decks of 38”, 42”, 46”, 48”, 54” and 60”.

Our Timken Lawn Mower Deck Bearings include trash guard double rubber seals.  These are standard on this bearing to insure protection from contaminants of soil, grass and moisture.  Each trash guard seal consists of carbon steel in which a Buna N Seal is attached.  The seals are crimped into the outer ring with a rubber lip riding on the inner ring.  Slight misalignment of the bearing will not affect its effectiveness.

The bearing is factory lubricated with grease.  The prelubrication and double seals eliminate the need for extra servicing.

The nylon retainer’s shock resistance and longevity are a match for the rough conditions and maintenance demands of most applications.

This bearing can be found here … for $10.00 each.

NSK 6205 DDUC3 Electric Motor Quality Ball Bearing

Tuesday, May 24th, 2011

GIVE AN ELECTRIC MOTOR THE SILENT TREATMENT

Selecting bearings for electric motors can make a big difference when you want to ensure long life and quiet operation.  The design, manufacturing and quality measures NSK incorporates throughout production minimise electric motor noise and ensure years of problem-free operations.

Cleaner Steel

If there was ever an opportunity to cut corners, this would be it; use a steel of marginal quality, sell at a reduced price and hope no one notices the difference

An innovator in bearing steel, NSK uses SUJ-2 steel for balls and rings.  SUJ-2 steel is ultra-clean, vacuum-melted bearing steel, much cleaner than typical industry standard steel.  With an oxygen content lower than 9 parts per million coupled with the proper treatment, NSK electric motor bearings have nearly double the fatigue life.

Superfinished Raceways and Maximum Sphericity

A super finish on both raceways means less wear at start-up, better performance out of the lubricant and smooth, quiet operation.  NSK accomplishes this through a proprietary method of honing the raceways to finishes at the sub-micron level.  For added value, NSK tests every bearing for low noise and vibration characteristics before the “quiet” rating is applied.

Rough bearing raceways inhibit lubrication and can lead to increased noise.  At NSK, raceways for electric motor bearings are finished to a super-smooth condition using a custom honing process they developed specially for this purpose.  This finish guarantees excellent lubrication and extends bearing life.  To enjure the smoothest possible operation, NSK uses high-grade steel balls manufactured using a proprietary process.  The result is an extremely quiet running bearing.

The ball set plays an integral role in the smooth and efficient operation of a bearing.  Not only do they need to be extremely close in size and tolerance, but are required to be nearly perfect in shape. At least by NSK standards.

Cage Advancements

It’s the small things that sometimes make the difference.  Like the close tolerances NSK achieves by coining the cage pockets.  The results are better distribution of the lubricant, less noise and reduced internal friction.  The benefit is a strong cage with a lower operating temperature and higher speed limits and ultimately it means longer bearing life. 

NSK also provides molded polyamide cages with optimized ball pocket designs.  Their conformance with the rolling elements reduces friction for quieter operation with improved grease life.  Bearings with polyamide cages also have lower torque at high speeds and are more tolerant of misalignment.

High-Temperature Grease

NSK offers a variety of lubricants to suit a wide range of applications.  When it comes to electric motors, the AS2 and NS7 greases are superior quality grade lubricants formulated to deliver low starting torque and extended service life. 

This grease offers high-temperature capability with low-noise characteristics in its electric motor bearings.  The wide temperature range prolongs the life of the grease, which in turn extends the bearing life.  You get smoother and quieter operation throughout the life of the bearing.

Quality from Start to Finish

In the manufacturing process, NSK uses the latest in automated equipment to achieve superior consistency.  At each step in the process, the latest  Statistical Process Control (SPC) techniques are applied.  NSK builds in quality you can count on, with thorough in process gauging.  Each bearing is tested for noise and vibration levels, using side-by-side Anderometer in the manufacturing line.  The Anderometers measure the degree of geometric and surface protection.  Any bearing that does not pass the low, medium and high-frequency tests is automatically rejected.

The Right Clearance

To accomplish that goal NSK identified the optimum RIC for electric motor bearings: CM.  NSK believes this range provides the right amount of clearance to meet the goal while controlling the air gap between rotor and stator, delivering quiet operation and increased efficiency.  NSK also provides bearings with CN and C3 clearances used in electric motors. The results create a much quieter running motor.

Shields, Seals and the VV

Bearings with two enclosures are pre-greased at the factory and are classified as “greased for life”.  This simply means that the type and amount of grease is sufficient to outlast most general applications, with the exception of temperature extremes, contamination, high load and high speed.

Enclosures are defined as either contact or non-contact and refer to any gap at the inner ring.  The popular Z metallic shield does a good job of keeping the grease in place and larger contaminants out of the bearings. NSK applies an anti-corrosive coating to their Z shield in the event of moisture and because they are non-contact, their operating speed and starting torque are unaffected.

For more arduous service conditions, the DU seal is in full contact with the inner ring, increasing grease retention and excluding a wider range of contaminants from entering the bearing but generate more head and therefore have reduced operating speeds.  Enter the V seal from NSK. Zero drag, low staring torque, maximum operating speeds, no excessive heat and increased grease retention and contaminant protection over the shield design.  The V seal from NSK delivers an alternative that’s fast becoming the standard in election motor bearings.

Guaranteed Results

You can depend on NSK for quieter running electric motor bearings with the design, manufacturing, and built in quality  that you need.

**********

Check out our

NSK 6205DDUC3 EMQ Ball Bearing sale going on  .. located in our ON SALE section of our website

NSK 6205DDUC3 EMQ
Electric Motor Quality Ball Bearing
Regular price = $12.45 each
Sale price …. $6.12 each
Until 6/30/11

 

The Timken ISOCLASS Bearing Spectrum

Tuesday, May 24th, 2011
  • Standard IsoClass Bearings

The 30000 series bearings included in the original ISO/R355 standard, often referenced as DIN720, now constitute the core of the IsoClass line of metric bearings.

  • IsoClass Spacer Assemblies

A wide range of spacer assemblies is available for numerous applications in the original-equipment and replacement markets.

Most single-row standard IsoClass bearings can be supplied as a two-row, pre-set, ready-to-fit assembly by adding spacers machined to pre-determined dimensions and tolerances.

  • Customized IsoClass Bearings

Modified and flanged IsoClass bearings are indicated by prefixes and/or suffixes to the basic part number.  These bearings are not interchangeable with bearings sharing the same basic part number.

  • Modified IsoClass Bearings
    • Timken has developed modified ISO 355 bearing designs to meet specific application requirements.  These bearings have a modified external configuration or internal geometry.
    • Flanged IsoClass Bearings
      • A variation on standard IsoClass bearings, the flanged outer race facilitates axial location and accurately aligned seats in a through-bored housing.
  • ISO STANDARDS

The ISO 355 international  metric standard defines dimensions and cup angles for single-row tapered roller bearings.  Originally intended to replace the ISO/R 355 standard, the new ISO 355 standard defined additional bearings and created new designation codes for the entire dimensional codes for the entire dimensional spectrum of ISO 355 metric bearings.

Because new designation codes for bearings that were in accordance with both the old and new standards.

With the Challenges ….

Thursday, May 19th, 2011

…. Of a new millennium, striking a balance among innovation, quality, performance and economics could be a formidable task for some bearing suppliers.  But not for The Timken Company.

For the past century, Timken has worked to blend these essential elements to create enduring value for their customers.  This focus, and the synergy between Timken’s steelmaking and bearing manufacturing organizations, adds up to a degree of product knowledge that is unsurpassed in the world.

Today, the measure of Timken’s success can be stated quite simply; Timken is the world’s largest manufacturer of tapered roller bearings.  They have led the bearing industry in nearly every significant technological advancement, manufacturing evolution, and material enhancement since Henry Timken first patented the tapered roller bearing in 1898.

Of course, maintaining this leadership position requires a full measure of dedication.  Stemming from the core of the Timken organization is a passion for quality in all that they do and a steadfast commitment to offer a spectrum of bearings and related services that add value to your own end product.

You will find this particularly true when it comes to our line of metric tapered roller bearings.

  • AN EXTENSIVE SELECTION OF 30000 SERIES METRIC BEARINGS

The Timken IsoClass brand was developed to encompass and expand Timken’s range of metric bearings – and provide you with outstanding value now and in the future.  The result is an extensive line of ISO bearings with more than 170 part numbers in the 30000 series readily available.

A closer look will show that Timken IsoClass bearings represent a commitment that reaches far beyond adopting a new brand.

For example, since 1996, Timken has invested more than $60 million in new plants and people to support the IsoClass product line.  They have added 30 part numbers to allow them to provide a full line of products to meet this important market’s needs.

In research and development, Timken has invested more than 50,000 hours to evaluate and develop  new and existing designs and 500,000 hours in performance testing.  They have expanded their metric manufacturing capacity with facilities in Italy and Poland joining our other plants in Brazil, Canada, China, France, Great Britain, Romania, and the United States.

Koyo – Bearing Mounting Tool Kits

Tuesday, May 10th, 2011

Koyo BMT 39 - Bearing Mounting Tools

 

Practical Mechanical mounting set for safe, precise and quick mounting of bearings, bushings, sealing rings, cam wheels and pulleys.  The set consists of a dead-blow hammer, 3 aluminum sleeves and a set of 39 plastic collets (rings).

The impact resistant plastic collets support the inner and outer rings when mounting, preventing metal to metal contact and possible damage to the bearing rings and shaft.