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2. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   Left-handed drill bits allow a machining operation to continue where either the spindle cannot be reversed or the design of the machine makes it more efficient to run left-handed. With the increased use of the more versatile CNC machines, their use is less common than when specialized machines were required for machining tasks.

3. Annular cutter - Wikipedia

   en.wikipedia.org/wiki/Annular_cutter

   The cost of a core drill is high compared to a twist drill, but the cost per hole made with the core drill is less as compared to twist drills, this is because a single core drill makes 5 to 10 times more holes than a twist drill. [9] Annular cutters are more fragile than a drill bits of the same diameter and may thus shatter more easily.

4. Cutting tool (machining) - Wikipedia

   en.wikipedia.org/wiki/Cutting_tool_(machining)

   Linear cutting tools include tool bits (single-point cutting tools) and broaches. Rotary cutting tools include drill bits, countersinks and counterbores, taps and dies, reamers, and cold saw blades. Other cutting tools, such as bandsaw blades, hacksaw blades, and fly cutters, combine aspects of linear and rotary motion. The majority of these ...

5. Sharpening - Wikipedia

   en.wikipedia.org/wiki/Sharpening

   Special tools and skills are more often required, and sharpening is often best done by a specialist rather than the user of the tool. Examples include: Drill bits - twist drills used for wood or steel are usually sharpened on a grinding wheel or within a purpose made grinding jig to an angle of 60° from vertical (120° total) although sharper ...

6. Hughes Tool Company - Wikipedia

   en.wikipedia.org/wiki/Hughes_Tool_Company

   This included the drill bit (well) and tool joint product lines critical for oil and gas drilling, some of the first technologies for ram blast bits for drilling in mines, geothermal drilling, and a hydraulic powered jackhammer known as the Hughes Impactor. [7]

7. Grinding (abrasive cutting) - Wikipedia

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

   Portable power tools such as angle grinders, die grinders and cut-off saws; Stationary power tools such as bench grinders and cut-off saws; Stationary hydro-or hand-powered sharpening stones; Milling practice is a large and diverse area of manufacturing and toolmaking. It can produce very fine finishes and very accurate dimensions; yet in mass ...