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Bearings are made of many different materials, and many of these materials function more effectively in certain applications than others. Take a minute to learn about the many different types of materials bearings can be made of: 1. Chrome Steel – SAE 52100 This is the most common material used for precision ball bearings, roller bearings, and tapered roller bearings . This still has a high level of carbon within it and contains about 1.5% chromium. These bearings have a high resistance to cracking and a hard surface, which helps them to resist wear and tear from rolling. 2. Extra Clean 52100 Chrome Steel This type of steel is used to create precision miniature bearings. It is processed with additional melting steps. The resulting bearing is extremely quiet. Most often, the hardening process is done in a controlled atmosphere furnace. The resulting product can operate at temperatures up to 120°C. SAE 52100 is by far the best general purpose steel for making bearings. It hardens to a very high level and has a long life when actually in use. However, the low chromium level of 1.5% means these bearings are not very resistant to corrosion. 3. Martensitic Stainless Steel – AISI 440C This type of bearing has higher carbon content. The lower carbon content results in a softer material, however, it does allow for these bearings to be magnetic. These bearings are slightly nosier than others, but they are able to operate at high temperatures of up to 250°C. 4. Martensitic Stainless Steel – 440C – ACD34 This material has smaller carbides in order to minimize noise, while also offering the same corrosion resistance as 440C. This is one of the most widely used materials for bearings, and it can bear similar loads to that of chrome steel. 5. Austenitic Stainless Steel Bearing components made from this type of stainless steel have a high resistance to corrosion and are non-magnetic because they are made with low amounts of carbon. However, this material cannot be hardened, so it only works with low loads and low speeds. These bearings are typically a special order and also carry a higher cost.
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Materials used in Bearings
by Jess Zimmerman. New cuteness rule: Anything that contains a smaller version of itself is adorable. Think about it: Kangaroos, koalas, Mandelbrot sets. (No? Adorable fractals? Nobody?) Ergo the McCar, from Chinese company Geely, is the cutest EV ever, because it’s not just a sweet little full-electric or hybrid car. It also contains a tiny fold-up electric scooter, which charges itself as you drive. For us poor suckers who live outside the city, this is brilliant
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Nesting doll EV is an electric car with an electric trike inside
CC flickr photo courtesy of umjanedoan With the prospect of lasting climate change regulation on the horizon, environmental law has never been more important. We rely on the nation’s top environmental law schools to train the next generation of environmental lawyers.
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Best Environmental Law Schools
The future’s looking bright for sustainable cars. You may have read our article on Electric Cars for 2011 and wondered what is ahead for 2012 and beyond. Here’s a preview of what’s in development. We’ll provide specs where we can, but as many of these are early-stage concepts, you can’t really take the car company’s word for it. Once the automotive press gets ahold of it and consumers can drive it, then we will have a good idea of each car’s strengths and weaknesses. To briefly recap, electric cars have an electric drivetrain with power coming from powerful, high-tech batteries. Electric cars can be plug-ins, or feature a small, fuel-powered internal combustion engine that works as a generator to recharge the batteries
Some folks are up in arms over Energy Independence and Security Act (EISA) of 2007, which requires 25% more efficient light bulbs starting in January 2012. The bi-partisan law phases out the standard Edison bulb in favor of better options like this upgraded light bulb. The Philips EcoVantage light offers an incremental improvement over the norm with 28% energy savings, a low price, and incandescent-style light. Specifically, the 29-watt EcoVantage light bulb replaces the standard 40-watt incandescent, the 43-watt bulb replaces the 60-watt incandescent, and the 72-watt bulb replaces the 100-watt incandescent. EcoVantage lights are dimmable, mercury-free, and cheap — about $2.99 per pack — according to an email from a representative from Philips. The EcoVantage bulb is available exclusively at Home Depot. And, to be clear, it’s an incandescent that uses halogen technology, so it has about the same lifespan of 1,000 hours. Alternatively, if you want a light bulb with a significantly longer life, low energy use, and incandescent-like color, perhaps the Philips AmbientLED would work. Credits: Philips Lighting.
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Philips Unveils Edison Light Bulb Killer