2 column news

 

 

PowerPoint of Pacamor’s Large Accomplishments in the

Aerospace and Defense industry.

 

View here: PKBpwr

 

 

PKB featured on RPI’s Success Stories’ website.

Read full article here: RPI Tech Campus Stories

Axially preloading of bearings provides the following benefits:

• Increases ring rigidity
• Applies pressure to the ball and raceways, eliminating slip or skidding
• Lowers the possibility of non-repeating runout
• Reduces contact angle variation between the inner and outer raceways

COMMON TECHNIQUES

• Spring Preloading – Using various types of springs
• Washer / Spacer Preloading – adding a precision ground washer/spacer between the inner or outer rings, removing axial and radial play
• Duplexing, which entails the precision grinding of the actual bearing faces.

SPRING method is the simplest method.  This method is less sensitive to thermal expansions and contractions.  It can also accommodate some misalignment in the system.

WASHER/SPACER method is a more tedious process requiring precise measurements of the endplay and matching it with precision washer/spacers.  This method is not as forgiving when subjected to thermal expansions and contractions or misalignment.

DUPLEX method is a process of removing material from a pair of bearing faces to adjust raceway offsets.  Clamping the bearing faces together creates the internal preload.  Duplex sets assist in satisfying the requirements of increased radial and axial stiffness, and also provide deflection control.

 

There are (3) methodologies:

PRELOADED PAIR MARKING

The following illustrates PKB’s standard marking scheme for each of the Duplex methodologies. 

The “V” in the Tandem set point in the direction of the axial force applied to outer ring.

If you have any questions or inquiries regarding duplex sets, contact us anytime.  sales@pacamor.com

Bearing Handling Practices  

 

Some Tips:

• Bearings should be kept in their original and unopened PKB packaging until ready to use.
• Open each bearing, one at a time, as needed for installation purposes.  Do not open extra bearings or expose unused bearings to the environment.
• Unused bearings should be kept in their original, protective PKB packaging.
• Bearings should be handled in a dust free environment that is clean, dry and free of static.
• Clean, lint-free garments should be worn by anyone that enters the work area.
• Fluids, solvents, and other materials that are not part of the assembly process should be kept away from the assembly area to prevent contaminating the bearings.
• Machining, filing, soldering, grinding, etc should be kept away from the assembly area to prevent contaminating the bearings.
• All tooling and instruments should be non-magnetic.  It is important to keep tooling and instruments clean and properly maintained to avoid burrs or other potential contaminants.
• Bearings should be handled with specially designed hand held instruments, such as plastic tweezers or tweezers with special work tips.
• In situations where the bearings must be handled by hand, it is important that clean, dry, unused, and lint free gloves and finger cots should be utilized.  Never touch the bearings with bare hands or fingers.
• Tooling and instruments should be cleaned with a spray, not sloshed in a bath of solvent.  Sloshing may allow cross contamination.
• Bearings, tooling & instruments must be kept demagnetized.  Should magnetism become evident, utilize a demagnetizer before exposing the bearing to the work environment.
• Any unused bearings that were removed from the PKB protective packaging should be stored in clean, dry containers, with proper identification labels.  A clean anti static glass covered dish is often an acceptable storage container between work shifts.
• See our Bearing Installation page for more information about proper installation of the PKB bearing into your device. 

 

Contact us with any miniature ball bearing requirements you may have.

PKB’s Clean-Room Bearing Maintenance and Re-lubrication Center meets Class-6, with Class-5 Clean Benches, per ISO 14644-1. 

Pacamor Kubar Bearings is pleased to offer clean-room services.

Have your ball bearings been in a stock room for 3 years or longer?  

Is the lube discolored or the packaging damaged?

Did your stockroom temperature and humidity ever fluctuate?  

PKB’s quality certified factory and clean-room are the right place to refurbish your ball bearing inventory.

 

 

Who better, than the ball bearing manufacturer, to re-lubricate your aging bearing inventory?   

Clean-Room Services:

• Wash & re-lube with the same lubricant
• Wash & change the lubricant to a different lubricant and/or lubrication process 
• Options include, but not limited to:

• • Grease 
  • Oil
  • Grease Plate
  • Oil Film
  • Oil Plate
  • Serialization
  • Dip & Drain
  • Dry-Film Lubricants (Dicronite, etc.)
  • Lube Dry (wash only)
  • Vacuum Impregnation
  • Lubricant & Solvent Mixtures
  • Lube Weight Documentation
  • PKB Stock Lubricants
  • PKB Specialty Lubricants
  • Customer-Supplied Specialty Lubricants

• Bearings repackaged in PKB Standard Clean Bags
• Bearings repackaged in specialty bags, to your specification
  • Intimate bearing packaging in Class 6 Clean Room, with Class 5 Clean Benches, meeting ISO 14644-1.
• Packaging options include, but not limited to:
  • Nitrogen purge
  • 1A8 bags
  • Vial pack
  • Pill pack 
  • MIL-197
  • Kitting
  • Other specialty packaging materials & processes

 

 Why Maintain Proper Bearing Lubrication?

Proper lubricant can reduce friction, prevent bearing wear, protect bearing surfaces from corrosion, and carry away excess heat during bearing operation.  

Bearings operate on a very thin film of lubricant which must be maintained, or replaced, to ensure that maximum bearing life is achieved.  

Proper selection, application, and maintenance are vital in maximizing bearing life.  

Maintaining your bearings with proper lubrication will reduce friction and wear.   

 

Can PKB Re-lube Bearings That Were Manufactured By Other Companies?

Yes. PKB regularly performs re-lubrication services on bearings that were originally manufactured by other bearing companies.    

 

When Should Bearings be Re-lubed?

PKB recommends that bearings should be re-lubed within three (3) years of the original manufacturer’s lube date, or if any of the following conditions occur:

• Bearings have been subjected to temperature or humidity conditions outside of the recommended temperature range
• Bearings have become contaminated 
• The original packaging has become damaged
• If you’re unsure of the lubricant’s expiration date
• There is any question about the quality, condition, or type of lubricant in the bearings
• The bearing lubrication appears to have separated, discolored, or otherwise changed appearance 

 

Can’t I Just Wash Out the Lubrication and Install New Lube?

Many 440C Stainless Steel Bearings that are used in Aerospace, Medical, and other applications, can be cleaned and re-lubricated, in proper clean-room conditions, and by trained personnel. Improper handling can result in cross contamination, problems with wettability on balls & bearing races, or ball & raceway damage. Other components affected or broken, are the retainers, seals, shields, balls, or wires.  PKB provides bearing wash and re-lubrication services, for many Aerospace OEM’s and authorized re-sellers, in our factory clean-room.

 

 

 

Bearing Lubrication – Most Requested Oils
Lubricant	Type	Viscosity (Centistokes)  @ 100 F	Viscosity (Centistokes)  @ 210 F	Operating Range (F)	Mil-Spec
WINSOR  L245X	DIESTER	31	5.3	-65 to +300	MIL-L-6085A
ANDEROL 401D	DIESTER	11.5	3.2	-65 TO +300	–
DC 510	SILICONE	38	14	-65 to +500	MIL-L-27694
KRYTOX143AC	FLUOROCARBON	260	26	-30 TO +550	–

 

Bearing Lubrication – Most Requested Greases
Lubricant	Base Oil	Thickener	Color	Operating Range (F)	Mil-Spec
ROYCO 27	DIESTER	LITHIUM	BROWNISH	-100 TO +300	MIL-G-23827
BEACON 325	DIESTER	LITHIUM	LIGHT TAN	-65 TO +250	MIL-G-3278
BRAYCOTE 601	PERFLUORINATED POLYETHER	TETRAFLUORO-ETHYLENETELOPMER	BEIGE	-100 TO +500	–
MOBIL 28	HYDROCARBON	CLAY	DARK RED	-65 TO +350	MIL-G-81322
SRI-2	MINERAL	POLYUREA	BLUE / GREEN	-20 to +350	MIL-G-3545G
KRYTOX 240AC	FLOURINATED GREASE	VIDAX	WHITE	-30 TO +550	MIL-G-27617
AEROSHELL 22	SYNTHETIC HYDROCARBON	MICROGEL	AMBER	-85 TO +400	MIL-G-81322

 

 Please Contact PKB for a quote to rework your in-house bearings, with new lubricant, or to make a lubricant change. 

 

sales@pacamor.com

More about Bearing Lubrication from PKB:

 

The most popular bearing lubricants are listed on our Lubrication Page. Many more oil, grease and dry-film lubricant options are available, upon request. 

More How-To Guides:

• Read our How-to Guide: Proper Lubrication of Miniature & Instrument Ball Bearings
• See our Shaft and Housing Fits page for a detailed chart and more information line to line, interference & loose fits onto a bearing shaft or into a housing.

We are excited to discuss with you our miniature and instrument bearing capabilities. 

PKB manufactures ball bearings for some of the world’s most respected small motor brands. 

We also offer:

 

 – SHORT LEAD-TIMES 

Shorten your ball bearing lead times with our domestically produced bearings, manufactured and assembled in Troy, NY. 

– COMPETITIVE PRICES 

Best prices in the domestic bearing industry!

Reduce your domestic ball bearings costs with our Veteran-American Owned & Operated Small Business. 

– RELIABLE QUALITY 

Expedite time to market for your new and updated products. 

– PROTOTYPE SPECIALISTS 

Your engineers will love our speedy delivery of engineering prototypes and evaluation samples.

Here is a testimony, about PKB bearings, for small motor applications, from Kearfott Guidance & Navigation

Here is a testimony from another happy customer. This one is for PKB cryogenic bearings for Flowmeter applications, from the President of Hoffer Flow Controls

Our wide range of miniature and instrument bearings are used in an array of small motors, actuators, encoders, often found in aerospace, space, military, medical and surgical applications. 

We have proudly supplied products for the NASA Docking Station, NASA James Webb Space Telescope, MARS 2020 Rover, Sikorsky Helicopters, Cryogenic Flowmeter Applications, FAA TSO-C149 Aircraft Bearing applications, many military and Department of Defense (DoD) applications, as well as other space, aerospace, medical, and customized applications.  

 

Pacamor Kubar Bearings – sales@pacamor.com