lubricating rotary bearings

Easy Maintenance Tips for Your Rotary Bearings

Most production facilities have some kind of rotary bearings, and while they are working, no one gives them much thought. But as the saying goes, a little ounce of prevention can spare a huge pound of broken down machinery. That prevention always includes making sure your rotary bearings are well lubricated and within their life spans. The easiest, simplest method of knowing when to lubricate or replace your rotary bearings is to watch your bearings and keep good notes. Most bearing manufacturers provide information and instructions on bearing life spans and lubrication schedules – this is always a great place to start when you are developing a strategy. Of course, you can’t beat real world results when it comes to calculating when your bearings need lubrication, maintenance, or replacement.

However, if your equipment is older, if you can’t get manufacturer information, or if you can’t risk having a production line go down, you can still get some approximations for life span and lubrication. You will have to gather some information and dust off your calculator, but the process is pretty straightforward. For example, rotary bearing life is expressed in this equation:

Screen Shot 2014-05-27 at 12.25.40 PM where:

  • L: nominal life of the bearing in millions of revolutions
  • C: basic dynamic load rating (provided by the manufacturer, or find common values)
  • P: equivalent dynamic bearing load (how much load your bearing is supporting, specific to your situation)
  • a: exponent
    • a = 3 for ball bearings
    • a = 10/3 for cylindrical, needle, spherical, and tapered roller bearing

Filling in your information will give you an idea of when you should replace your rotary bearing. Make sure to watch your units on the loads – manufacturers might supply them in Newtons rather than in pounds. Now what about lubrication? The expected life span, of course, assumes that you are properly maintaining your rotary bearings with a good quality lithium or mineral oil grease. To get an estimate of when to pull out that grease gun and go hit the assembly line, use this equation: Screen Shot 2014-05-27 at 12.33.03 PM where:

  • t: lubrication time interval in hours of operation
  • K: bearing constant
    • K: 1 for spherical or tapered roller bearings
    • K: 5 for cylindrical or needle bearings
    • K: 10 for radial ball bearings
  • d: bearing bore diameter in millimeters (watch your units)
  • n: rotation speed in revolutions per minute

Just glancing at the equations can seem a little challenging, but breaking down the variables is actually pretty simple. Remember, always take good notes and document your work. It is not only good practice, but it also gives you a great resource to follow for future maintenance needs. Now you should have a good idea on both when your bearing should fail, and when you need to lubricate to prevent it from failing prematurely. So grab your tape measure, calculator, and favorite grease gun and get to work on maintaining those rotary bearings! If you have any further questions, Misumi is always happy to help. Please leave comments and questions below, or call 800-681-7475 to talk to one of our experts!

4.3 (86.67%) 6 votes

Share this Story
Load More Related Articles
Load More By Brooke Bartos
Load More In Tips & Tricks

Check Also

Mastering Ball Screws Pt. 2: Ball Screw Preloads

Preloading is used to increase the feed accuracy and ...

Subscribe to our Channel

Follow Me @usa_misumi

Like us on Facebook

Find us on Google Plus

FOLLOW @ INSTAGRAM

  • Bigfoot. Shout out to @makeitinc on their large scale 3D printer using #misumi aluminum extrusion, EFS series. They've printed parts for a Mazda Miata. What a beauty. #3dprinting #framework #design #bigfoot
  • Who wants to work on a Saturday? We do! Call or chat with us! #saturdays #happycaturday #workhard
  • Congrats to the MISUMI USA Recreational Softball team on their very first win yesterday in the Schaumburg Corporate Softball League!! #coedsoftball #proud #winners #wearenumberone #sports #softball #team
  • ATS has awarded us with its 2017 Global Supplier of the Year Award! We are so happy to receive this prestigious award and will continue to deliver best-in-class results for our customers! #proud #supplieroftheyear #awards #bestservice
  • Congrats to our sponsored #FIRST Tech team @mechanicalparadox7182 for taking 5th place at WORLDS, Winning Alliance at the Maryland Tech Invitational and the #MISUMI Mastery Award 2017! Keep it up! Enjoy your customized backpacks on us 😎😉#flex #backtoschool #FIRSTinspires
  • We absolutely love this #application of Aluminum Extrusion from @silver_sequoia ! Like true #engineers mocking up a CAD model, assembly, and finished product they showed anything is possible with this versatile product. We think all airstream trailers should include AEX. 😉what do you think? Thank you Shane and Cynthia! 👍🏼
  • @paradigm.hyperloop's brake module designed to decelerate the pod by clamping to the aluminum rail running down the center of the SpaceX Hypertube. We're excited to support this student project! #hyperloop #spacex #engineering #mechanical #engineeringlife #engineeringstudent
  • Be sure to check out our new configurable MRO (maintenance, repair, and operations) products!
.
.
.
.
.

#sloth #slothlover #engineer #engineeringlife #maintenance #repairing #operations #electric #cable #cuttingtools #endmill #power #wild #misumi #manufacturing #design #components #mechanical #fun #work #replacements #wild #industrial #supply #quality #fix #tree #slothlove