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2. Grinding wheel - Wikipedia

   en.wikipedia.org/wiki/Grinding_wheel

   Grinding wheels are self-sharpening to a small degree; for optimal use they may be dressed and trued by the use of wheel or grinding dressers. Dressing the wheel refers to removing the current layer of abrasive, so that a fresh and sharp surface is exposed to the work surface. Trueing the wheel makes the grinding surface parallel to the ...

3. The Churchill Machine Tool Company - Wikipedia

   en.wikipedia.org/wiki/The_Churchill_Machine_Tool...

   The dividend for both of these years was 20%, but in 1953 there was also a special distribution of 2d/share for capital profits of £17,810 from sale of investments. [85] The company self-published its history for its golden jubilee year of 1956: The story of The Churchill Machine Tool Co. Ltd.: a history of precision grinding. [86]

4. Grinding (abrasive cutting) - Wikipedia

   en.wikipedia.org/wiki/Grinding_(abrasive_cutting)

   A man grinding on metal using an angle grinder, causing a lot of sparks. Grinding is a type of abrasive machining process which uses a grinding wheel as cutting tool. A wide variety of machines are used for grinding, best classified as portable or stationary: Portable power tools such as angle grinders, die grinders and cut-off saws

5. Boring machine (carpentry) - Wikipedia

   en.wikipedia.org/wiki/Boring_machine_(carpentry)

   The exact origin of this invention is not known, but the earliest patent is in the United States in 1830 by J. Beckwith and was as tall as a man and operated by a large wheel from the side. [2] Boring machines use twist auger bits usually ranging in size from 7 ⁄ 8 inch to 2 inches. The machines hold the bit perpendicular (square) to the face ...

6. Grinding machine - Wikipedia

   en.wikipedia.org/wiki/Grinding_machine

   Its primary function is in the realm of grinding holes for drill bushings and grinding pins. It can also be used for complex surface grinding to finish work started on a mill. Gear grinder, which is usually employed as the final machining process when manufacturing a high-precision gear. The primary function of these machines is to remove the ...

7. Roller cone bit - Wikipedia

   en.wikipedia.org/wiki/Roller_cone_bit

   A roller-cone bit is a drill bit used for drilling through rock that features 2 or 3 abrasive, spinning cones that break up rock and sediment as they grind against it. Roller-cone bits are typically used when drilling for oil and gas. [1] A water jet flowing through the bit washes out the rock in a slurry. [2]