Advanced EMC Technologies Blog
3D printed parts were once limited to prototypes suitable only for visual observation and dimensional checks, but with new advances in both technology and working materials, companies can now produce go beyond fragile prototypes and use 3D printing for actual production of limited run parts.
There is far more to selecting a polymer bushing than just making sure the PV limit is acceptable and the dimensions are adequate.
What is Reverse Engineering?
Reverse engineering means to recreate a part based on available data about it. Keep in mind that the goal of reverse engineering is not so much as to create a part that looks and feels identical to the original part (although it can be), but rather provides the same (or better) performance as the original part. The material might be different. While it will likely fit in the same space envelope, non-critical geometry might not be the same. However, the part achieves the same purpose and performs the same function.
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There are a variety of bushings in your typical off-road bicycle, from the rear derailleurs to free wheeling hubs. These types of bikes require bushings that can handle a demanding, intense, unpredictable environment. There are a variety of materials to choose from, and in this article we are going to look at carbon fiber reinforced PPS material..
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The amount of wear a bearing is going to experience is related to the bearing pressure and the running velocity. The more pressure applied to the bearing, the faster it will wear; similarly, the faster the bearing surface speed, the more wear will occur. Did you ever wonder why? One clue lies in the amount of heat that is generated as a result of interaction between the bearing and the shaft. The more heat that is generated, the faster the bearing will wear. One value that represents this relationship between heat generated and the resulting wear is the PV value. You will see this value used as a key part of the material selection process when specifying a bearing.
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Posted in: Polymer Bearings
Food & Dairy Bearings and Bushings:
Bearings and bushings can be found in almost every step in food or dairy processing industries. Polymers are a popular choice for bearings and bushings in the food and dairy industry, both at the design stage and when retrofitting. Because they are greaseless, the can provide a more sanitary environment for food processing. They don’t require the maintenance that metal bearings and bushings require, thus reducing downtime for maintenance. Their durability results in longer mean times to failure. They are usually much more resistant to corrosion and much less chemically reactive than metal bearings and bushings. They also weight much less than equivalent metal bearings and bushings.
Here are some other posts on Food & Dairy Industry Polymer Components from Advanced EMC Technologies:
Plastic Molded Bearings vs. Powdered Metal Bushings
Engineers are turning to molded plastic bushing and bearings as a replacement for powdered and sintered metal wear components. In this article, we are going to take a look at four specific reasons why.
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Plain Bearings VS. Plane Bearings
There is some disagreement in the engineering community as to whether a plain bearing is the same as a plane bearing. Is a plane bearing a flat bearing, or can it refer to bearings with round surfaces, like journal bearings? This article may not establish a firm answer to this question, but it will give food for thought.
The controversy began from the first Bearing Basics post. Here are other artices on polymer bearings :
Polymer Roller Bearings
|Working principle for a ball bearing
CC BY-SA 3.0
Radial Deep Groove Ball Bearings (also known as Conrad bearings) are some of the most commonly used ball bearings. In deep groove ball bearings, the dimensions of the raceways are almost the same as the dimensions of the balls. The grooves consist of circular arcs with a radius just a little bit larger than the ball radius. The groove depth is typically ¼ of the ball diameter. This geometry of the bearing to carry radial, axial, and combined loads. However, they are used when the primary load is going to be radial. Its ability to carry an axial load depends on how much clearance there is in the bearing after installation: if the balls are able to contact the groove at an angle, then they can support a radial load.
You can find them with either single or double rows. Double rows work well supporting moment loads that may be acting on the shaft. These bearings are usually not separable, and the raceway is continuous. They are also not self-aligning, so it is important that they be correctly aligned when they are installed. Also note that even if they are not going to be lubricated, deep groove bearings are going to need some type of seal or shield to protect them from contaminants that will compromise both their performance and life span.
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