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The first larger round hay baler was invented by Gary Vermeer in 1971. Allis Chalmers first introduced the small round rotobaler in 1947. Vermeer begins building large trenchers to lay underground pipelines in the 1980s. The first Vermeer horizontal directional drill is introduced in the 1990s. [9]
A chain trencher cuts with a digging chain or belt that is driven around a rounded metal frame, or boom. It resembles a giant chainsaw. This type of trencher can cut ground that is too hard to cut with a bucket-type excavator, and can also cut narrow and deep trenches. The angle of the boom can be adjusted to control the depth of the cut.
BWEs built since the 1990s, such as the Bagger 293, have reached sizes as large as 96 m (315 ft) tall, 225 m (738 ft) long, and as heavy as 14,200 t (31,300,000 lb). The bucket-wheel itself can be over 21 m (70 ft) in diameter with as many as 20 buckets, each of which can hold over 15 m 3 (20 cu yd) of material. BWEs have also advanced with ...
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Consider how much longer it takes the Senate to finish confirming most of the high-profile secretariats for the 15 executive departments in a newly elected president's Cabinet.
Roller chain and sprocket The sketch of roller chain, Leonardo da Vinci, Codex Atlanticus. Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.
The Vikings currently stand as the NFC's top wild-card seed, but Minnesota could make a major leap in the playoff picture in the next two weeks.
Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.