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2. Hardened steel - Wikipedia

   en.wikipedia.org/wiki/Hardened_steel

   This is the most common state for finished articles such as tools and machine parts. In contrast, the same steel composition in annealed state is softer, as required for forming and machining. Depending on the temperature and composition of the steel, it can be hardened or softened. To make steel harder, it must be heated to very high temperatures.

3. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   Twist drill bits are available in standard lengths, referred to as Stub-length or Screw-Machine-length (short), the extremely common Jobber-length (medium), and Taper-length or Long-Series (long). Most drill bits for consumer use have straight shanks. For heavy duty drilling in industry, bits with tapered shanks are sometimes used. Other types ...

4. 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 ...

5. Cutting tool (machining) - Wikipedia

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

   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 types of cutting tools are often made from HSS (High-Speed-Steel).

6. 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 ...

7. Hardening (metallurgy) - Wikipedia

   en.wikipedia.org/wiki/Hardening_(metallurgy)

   Machine cutting tools (drill bits, taps, lathe tools) need be much harder than the material they are operating on in order to be effective. Knife blades – a high hardness blade keeps a sharp edge. Bearings – necessary to have a very hard surface that will withstand continued stresses.