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Knife and scissor grinder sharpening a knife on a water-cooled grinding wheel, 2018.. A scissor grinder (German: Scherenschleifer), sometimes also scissor and knife grinder or knife and scissor grinder, for short also knife grinder, is a craftsman who sharpens and repairs blunt knives, scissors and other cutting tools.
The 3 cm MK 303 Flak and twin-mounted 3 cm MK 303 Flakzwilling (M44) were experimental 30 mm anti-aircraft guns developed in Nazi Germany. They fired the powerful 30x210mm round and only 222 were produced. [ 1 ]
A number of blade sharpeners operate a mobile business, [1] [2] traveling to their customers locations, often in highly equipped vehicles. Less common in developed nations. Still very common in many areas of the world, skilled craftsmen provide a roadside sharpening service for kitchen knives and cleavers, scissors, and sometimes other blades.
Recently, manual sharpening tools have appeared in the form of systems that guide the blade against the stone at a predetermined angle. One such system is known as the HORL principle, which combines a cylindrical sharpener with a magnetic angle support, allowing the knife blade to be held at an angle of 15° or 20° while being sharpened with a ...
The term is based on the word "whet", which means to sharpen a blade, [3] [4] not on the word "wet". The verb nowadays to describe the process of using a sharpening stone for a knife is simply to sharpen, but the older term to whet is still sometimes used, though so rare in this sense that it is no longer mentioned in, for example, the Oxford Living Dictionaries.
The blade is made of non-rustproof carbon steel, blue-plastered by hand and finely forged from the base to the tip of the knife. The 90 mm (3.5 in) long blade shows patina (dark spots) caused by decades of use. It can easily be sharpened to a shaving sharp edge. Carbon steel is a popular choice for rough-use knives and cheaper options.
Size comparison between 30×170mm and 5.56x45mm NATO. The 30 mm caliber is a range of autocannon ammunition. It includes the NATO standardized Swiss 30×173mm (STANAG 4624), the Soviet 30×155mmB, 30×165mm and 30×210mmB, the Czechoslovak 30×210mm, the Yugoslav 30×192mm, the British 30×113mmB, and the French 30×150mmB and 30×170mm cartridges.
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