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2. Ball (bearing) - Wikipedia

   en.wikipedia.org/wiki/Ball_(bearing)

   The balls themselves are commonly referred to as ball bearings. [1] This is an example of a synecdoche. The balls come in many different grades. These grades are defined by bodies such as the American Bearing Manufacturers Association (ABMA), a body which sets standards for the precision of bearing balls. They are manufactured in machines ...

3. Ball bearing - Wikipedia

   en.wikipedia.org/wiki/Ball_bearing

   Ball bearings tend to have lower load capacity for their size than other kinds of rolling-element bearings due to the smaller contact area between the balls and races. However, they can tolerate some misalignment of the inner and outer races. Common ball bearing designs include angular contact, axial, deep-groove, and preloaded pairs.

4. 440C - Wikipedia

   en.wikipedia.org/wiki/440C

   440C (UNS designation S44004) is a martensitic 400 series stainless steel, [1] and has the highest carbon content of the 400 stainless steel series. It can be heat treated to reach hardness of 58 to 60 HRC. It can be used to make rolling contact stainless bearings, e.g. ball bearings and roller bearings. It is also used to make knife blades.

5. Friedrich Fischer - Wikipedia

   en.wikipedia.org/wiki/Friedrich_Fischer

   Fischer designed the ball grinding mill, a machine that allows steel balls to be ground to an absolutely round state in large volumes for the first time. His innovation was to tilt slightly the grinding wheel by 1.9°, forcing the balls to rotate on both their axis while they are ground. [ 1 ]

6. Bearing (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Bearing_(mechanical)

   A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

7. 11-Year-Old's Brain Tumor Discovered After Roller Coaster ...

   www.aol.com/lifestyle/11-olds-brain-tumor...

   Related: 8-Year-Old Boy's Dream of Skydiving Finally Comes True After Lazy Eye Led to Terminal Cancer Diagnosis (Exclusive) Campbell was diagnosed with medulloblastoma, a type of brain tumor that ...