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2. DN factor - Wikipedia

   en.wikipedia.org/wiki/DN_Factor

   DN factor. DN factor, also called DN Value, is a number that is used to determine the correct base oil viscosity for the lubrication of various types of bearings. [1][2][3][4][5] It can also be used to determine if a bearing is the correct choice for use in a given application. [3] It is a product of bearing diameter (D) and speed (N). [1][2]

3. High-speed steel - Wikipedia

   en.wikipedia.org/wiki/High-speed_steel

   High-speed steel (HSS or HS) is a subset of tool steels, commonly used as cutting tool material. It is superior to high-carbon steel tools in that it can withstand higher temperatures without losing its temper (hardness). This property allows HSS to cut faster than high carbon steel, hence the name high-speed steel.

4. Rolling-element bearing - Wikipedia

   en.wikipedia.org/wiki/Rolling-element_bearing

   The fourth character is the accuracy ratings, which normally are, in ascending order: 0 (normal), 6X, 6, 5, 4, T, and 2. Ratings 0 and 6 are the most common; ratings 5 and 4 are used in high-speed applications; and rating 2 is used in gyroscopes. For tapered bearings, the values are, in ascending order: 0, N, and X, where 0 is 0, N is "normal ...

5. 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.

6. Flat honing - Wikipedia

   en.wikipedia.org/wiki/Flat_honing

   Flat honing is a metalworking grinding process used to provide high quality flat surfaces. It combines the speed of grinding or honing with the precision of lapping. It has also been known under the terms high speed lapping and high precision grinding. [1]

7. OPINION: Trump rocks down to Electric Avenue and into ... - AOL

   www.aol.com/trump-rocks-down-electric-avenue...

   The video contains an animation of a high-speed red train bearing the words, "Trump Pence [Keep America Great] 2020," in stark contrast to a slow-moving handcar bearing the words, "Biden President ...