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Four-jawed chucks are primarily useful for gripping square or octagon material, while six-jawed chucks hold thin-walled tubing and plastic materials with minimum distortion. [ citation needed ] There are also independent-jaw (non-self-centering) chucks with three jaws, but they offer few advantages and are very rare.
Its first product was a two-jaw drill chuck. In 1910 the first patent – improved drill chucks – was filed. Export business started the same year. Due to the influences of World War I production came to a standstill and resumption turned out to be difficult after the end of the war. In 1926, RÖHM started the production of key-type drill chucks.
In many cases a general-purpose arrangement is used, such as a bit with cylindrical shaft and shank in a three-jaw chuck which grips a cylindrical shank tightly. Different shank and chuck combination can deliver improved performance, such as allowing higher torque, greater centering accuracy, or moving the bit independently of the chuck, with a ...
Center lathe with digital read out and chuck guard. Size is 460 mm diameter x 1000 mm between centers Size is 460 mm diameter x 1000 mm between centers In machining , a metal lathe or metalworking lathe is a large class of lathes designed for precisely machining relatively hard materials.
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Allis-Chalmers was a U.S. manufacturer of machinery for various industries.Its business lines included agricultural equipment, construction equipment, power generation and power transmission equipment, and machinery for use in industrial settings such as factories, flour mills, sawmills, textile mills, steel mills, refineries, mines, and ore mills.
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