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Chainsaw engines are traditionally either a two-stroke single-cylinder gasoline (petrol) internal combustion engine (usually with a cylinder volume of 30 to 120 cm 3) or an electric motor driven by a battery or electric power cord. In a petrol chainsaw, fuel is generally supplied to the engine by a carburetor at the intake.
This has two distinct advantages over scratcher chain – it enables the use of fewer cutters per unit length of chain, which allows for shorter downtime for sharpening, and produces a more "open" chain layout, allowing far better clearance of chips and debris from the kerf. Individual depth gauges on each tooth also enable the use of skip chain.
The National Endowment for Democracy (NED) popularised the term "sharp power" (in use since the early 19th century [3]) in November 2017; it appeared in an article in Foreign Affairs magazine describing aggressive and subversive policies employed by authoritarian governments as a projection of state power in democratic countries, policies that cannot be described [by whom?] as either hard ...
The substance on the sharpening surface must be harder (hardness is measured on the Mohs scale) than the material being sharpened; diamond is extremely hard, making diamond dust very effective for sharpening, though expensive; less costly, but less hard, abrasives are available, such as synthetic and natural Japanese water-stones. Several ...
Skil jigsaw Skil cordless drill. SKIL Power Tools is a brand of electric power tools and accessories located in Naperville, Illinois, United States. [1] It is a subsidiary of Chervon (HK) Ltd, a company based in Nanjing, China.
A pencil sharpener (or pencil pointer, or in Ireland a parer or topper [1]) is a tool for sharpening a pencil's writing point by shaving away its worn surface. Pencil sharpeners may be operated manually or by an electric motor. It is common for many sharpeners to have a casing around them, which can be removed for emptying the pencil shavings ...
Artillery saw, Chain saw, Portable link saw: a flexible chain saw up to 122 cm (four feet) long, supplied to the military for clearing tree branches for gun sighting; Butcher's saw: for cutting bone; many different designs were common, including a large one for two men, known in the US as a beef-splitter; most were frame saws, some backsaws;
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 ...
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