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Polymer Bushings Taking a Beating: Two Important Concepts behind the Wear and Tear

Polymer Bushing Mechanisms of WearPolymer_Bushings_on_Black-Shelf

Bushings have two mechanisms of wear: adhesion and abrasive.  Adhesion, as discussed in a previous post, occurs when two surfaces come into direct contact and the atoms from one surface adhere to the other surface.  Abrasion occurs when a harder surface contacts a softer surface and removes material from the softer surface.  For polymer bushings, the primary mode of wear is adhesion.  The key to understanding wear by adhesion is a proper understanding of how polymers respond to friction.

 

Here are some other articles relating to polymer bushings and bearings from Advanced EMC Technologies:

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Bearing Basics: Facts Your Boss Hopes You Know about “Plain Polymer Bearings”

Plain Polymer Bearings

In this article, we are going to look at the different types of “plain” (or “plane”) polymer bearings.  Both spellings are correct, it’s only a matter of blogger preference.   “Plain polymer bearings” is preferred for this article.  Recall that the purpose of bearings in general is to:

  • support shafts,
  • reduce the friction between contacting surfaces,
  • and to constrain motion along one or more axes. 

There are different ways to classify plain bearings, and in this article we will look at one possible means of classification:  sleeved, flanged, and thrust bearings.   

plastic-bearing-chart

Want even more Bearing Basics? Check out these articles from the Advanced EMC Technologies blog:

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Breakout Torque for Ball Bearings

What Is Breakout Torque?ball-bearings-breakout-torque-Advanced-EMC

Breakout torque (also known as break out torque or break-out torque) refers to the amount of torque required to initiate relative rotation between a rotary shaft and a seal or bearing, and plays a key role in systems that involve oscillatory movement.  Breakout torque is a function of both the inertia of the mechanisms involved and static friction.  In ball bearings, you will often see it referred to as the starting torque, and there it refers specifically to the amount of torque required to start the rotation of one ring of the bearing.

For more articles, infographics, and information check out: 

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PFA and TFM–to PTFE as Excellent Material Choice for Bellows and Diaphragms

Polymer Bellows and Diaphragms

PFA--TFM-Bellows-Diaphragms-Advanced-EMC

PTFE (polytetrafluoroethylene), aka Teflon, is typically the first choice polymer for bellows and diaphragms, but did you know that PTFE isn’t the only polymer you can choose from?  In this article we are going to compare two other polymers – PFA and TFM – to PTFE as a material choice for bellows and diaphragms.

 

 

Need more information? Check out these Advanced EMC Technology posts.

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4 Ball Bearing Facts You Should Know

Ball Bearing Facts

In this article, we are going to review some interesting facts about ball bearings that you should know.

bearing-breakout

 

Fact #1:  Who were the engineers behind the equations static load rating equations?

First, you should know the men originally behind the equations and formulas engineers use for calculating static load ratings. Richard Stribeck, a German engineer, academic, and researcher who published his groundbreaking papers on bearings in the early 1900s on which most of today’s load rating equations are still based.   In 1924, Arvid Palmgren of Sweden published a paper in Germany on the subject of bearing life and reliability.  His subsequent work with Professor Lundberg resulted in the Palmgren-Lundberg theory.  This theory evolved into ISO/ANSI/ AFBMA (Anti-Friction Bearing Manufacturers Association) standards for load ratings and life of rolling element bearings.

Here are some additional articles on advanced polymer bearings:

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No More Beating around the Bushing

Many young engineers may wonder exactly what the difference is between a bearing and a bushing, and polymer-bushing-metal-bearingsome may be too embarrassed to ask.  In this post, we are going to track down the difference.

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Selecting the Precise Polymer Bushing

INTRODUCTION:polymer_bushings_calculations

One of the major design factors in the choice of a polymer bushing is the expected operating PV.  The operating PV is the product of the surface speed of the shaft and the specific bearing load, and serves as an empirical tool for comparing the performance of different bearings.  

 

 

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Polymer Labyrinth Seals -7 Questions and Answers You Should Know!

Over 100 Years of Labyrinth Sealspolymer-labyrinth-seals-7questions

When it comes to seals, labyrinth seals are a standard design choice, and engineers have researching and implementing them for over one hundred years.  The purpose of this post it to present you with seven questions about polymer labyrinth seals that you should know the answers to.

 

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Ultimate Qualitative Cheat Sheet for Polymer Bushing Life Expectancy

Introductionpolymer-bushing-life-expectancy

Bushings, also known as plain bearings or sleeve bearings, are used in just about every industry, and have been for many, many years.  In this post we are going to look at the life expectancy of polymer bearings for a qualitative viewpoint, as opposed to a quantitative, calculation-based look. 

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Ball Valve Seals – 6 Key Materials You Should Know About

INTRODUCTION:ball-valve-seats-seals-oil-gas

The choice of a seal material for a ball valve is vital to its successful operation.  In this post, we are going to look at some of the major characteristics of six commonly used options for polymer seals in ball valves.

Here are some additional post on Polymer Seats and Sealing Solutions:

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