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2. Mower blade - Wikipedia

   en.wikipedia.org/wiki/Mower_blade

   The first known lawn mower had a cylinder cutting gear made of iron. [citation needed] It was used to mow sporting grounds and wide-ranging gardens.As manufacturers changed the design and structure of mowers, the cutting mechanism also developed and evolved into several varieties, including cylinder/reel blades, deck blades, mulching blades, and lifting blades.

3. X-Acto - Wikipedia

   en.wikipedia.org/wiki/X-Acto

   An X-Acto knife equipped with a "Number 2" blade Parts of an X-Acto knife from left to right: (1) handle, (2) collar, (3) collet, (4) blade. An X-Acto knife is a blade mounted on a pen-like aluminum body. A knurled collar loosens and tightens an aluminum collet with one slot, which holds a replaceable blade.

4. Harmonic damper - Wikipedia

   en.wikipedia.org/wiki/Harmonic_damper

   Harmonic balancer lower pulley on a four-cylinder engine. A harmonic damper is a device fitted to the free (accessory drive) end of the crankshaft of an internal combustion engine to counter torsional and resonance vibrations from the crankshaft. This device must be an interference fit to the crankshaft in order to operate in an effective ...

5. Lawn mower - Wikipedia

   en.wikipedia.org/wiki/Lawn_mower

   A residential riding or "ride-on" mower A battery-powered robotic lawn mower A commercial zero-turn mower. A lawn mower (also known as a grass cutter or simply mower, also often spelled lawnmower) is a device utilizing one or more revolving blades (or a reel) to cut a grass surface to an even height. The height of the cut grass may be fixed by ...

6. Knife sharpening - Wikipedia

   en.wikipedia.org/wiki/Knife_sharpening

   Knife sharpener in Kabul, Afghanistan (1961) The Knife Grinder by Massimiliano Soldani (c.1700), Albertinum, Dresden A railway camp cook sharpens a knife blade on a stone wheel, 1927. Knife sharpening is the process of making a knife or similar tool sharp by grinding against a hard, rough surface, typically a stone, [1] or a flexible surface ...

7. Robotic lawn mower - Wikipedia

   en.wikipedia.org/wiki/Robotic_lawn_mower

   A robotic lawn mower is an autonomous robot used to cut lawn grass. A typical robotic lawn mower (in particular earlier generation models) requires the user to set up a border wire around the lawn that defines the area to be mowed. The robot uses this wire to locate the boundary of the area to be trimmed and in some cases to locate a recharging ...