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2. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   They can be used on very thin sheet metal, but metals tend to cause premature bit wear and dulling. Unibits are ideal for use in electrical work where thin steel, aluminum or plastic boxes and chassis are encountered. The short length of the unibit and ability to vary the diameter of the finished hole is an advantage in chassis or front panel work.

3. Sharpening - Wikipedia

   en.wikipedia.org/wiki/Sharpening

   Sharpening these implements can be expressed as the creation of two intersecting planes which produce an edge that is sharp enough to cut through the target material. For example, the blade of a steel knife is ground to a bevel so that the two sides of the blade meet.

4. Knife sharpening - Wikipedia

   en.wikipedia.org/wiki/Knife_sharpening

   Diamond stones can be useful in the sharpening process. Diamond is the hardest naturally occurring substance known and as such can be used to sharpen almost any material. [8] (Coarse diamond sharpening stones can be used for flattening waterstones. [8] [9]) Alternatively, tungsten carbide blades can be used in knife sharpening. A clamp-on knife ...

5. Sharpness (cutting) - Wikipedia

   en.wikipedia.org/wiki/Sharpness_(cutting)

   Sharpened metal drop-point blade Naturally occurring sharp obsidian piece Shark tooth with a sharp, serrated edge A sewing needle comes to a sharp point. Sharpness refers to the ability of a blade, point, or cutting implement to cut through materials with minimal force, and can more specifically be defined as the capacity of a surface to initiate the cut. [1]

6. Tumbler knife sharpener review, after weeks of testing - AOL

   www.aol.com/news/tumbler-knife-sharpener-review...

   The block also has four angles for sharpening rather than just two (meaning you can more easily sharpen knives at a more particular angle) though at $150 it’s more expensive than the Tumbler.

7. Tool and cutter grinder - Wikipedia

   en.wikipedia.org/wiki/Tool_and_cutter_grinder

   View of a typical setup on a T&C grinder. A Tool and Cutter Grinder is used to sharpen milling cutters and tool bits along with a host of other cutting tools.. It is an extremely versatile machine used to perform a variety of grinding operations: surface, cylindrical, or complex shapes.