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An annular cutter (also called a core drill, core cutter, broach cutter, trepanning drill, hole saw, or cup-type cutter) is a form of core drill used to create holes in metal. An annular cutter, named after the annulus shape , cuts only a groove at the periphery of the hole and leaves a solid core or slug at the center.
Core drills used in metal are called annular cutters. Core drills used for concrete and hard rock generally use industrial diamond grit as the abrasive material and may be electrical, pneumatic or hydraulic powered. Core drills are commonly water cooled, and the water also carries away the fine waste as a slurry. [1]
A tungsten carbide cutter is needed, but the complex shape of a forstner bit is difficult to manufacture in carbide, so this special drill bit with a simpler shape is commonly used. It has cutting edges of tungsten carbide brazed to a steel body; a center spur keeps the bit from wandering.
Larger cutters, over 181 feet (55 m) in length, are controlled by Area Commands, the Atlantic Area or Pacific Area. Smaller cutters come under control of district commands. Cutters usually carry a motor surf boat and/or a rigid-hulled inflatable boat. Polar-class icebreakers (WAGB) carry an Arctic survey boat (ASB) and landing craft.
[11] [12] The AS Val can mount the PSO-1 telescopic sight of the SVD rifle, or the 1PN52-1 night sight. Iron sights are also provided to both rifles. [4] [18] According to Janes, the VSS telescopic sight has a length of 375 mm (14.8 in) and weights 580 g (20 oz), while the night sight has a length of 340 mm (13 in) and weights 2.1 kg (4.6 lb). [11]
This is a problem in many manufacturing processes, especially the firearms industry: the barrel of a gun must be very straight and accurately sized. Gun barrels are far longer than their inside diameter; as an example, the .223 inches (5.7 mm) caliber barrel of the M16 rifle is 20 inches (510 mm) long, nearly 90 times the diameter of the bore.
Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.
On the AKM assault rifle, the brake also angles slightly to the right to counteract the sideways movement of the rifle under recoil. Another simple method is porting, where holes or slots are machined into the barrel near the muzzle to allow the gas to escape. [13] More advanced designs use baffles and expansion chambers to slow escaping gases.