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精益生产教材(第一讲)ppt

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精益生产教材(第一讲)ppt

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这是一个关于精益生产教材(第一讲)ppt,主要介绍精益生产教材(第一讲)的英文内容。欢迎点击下载哦。

768 pulley blocks were used to operate Victory's running rigging. The smallest of these is 6 inches (15 cm) long, the largest is 26 inches (66 cm) long. Blocks were also used to lower and raise the ship's boats and anchors and for the loading and unloading of stores and provisions. There were 628 blocks used to work the great guns as well as a supply of spares. 1396 in total.
There was, in Mark Isambard Brunel's time a great demand for blocks, viz., a pulley or system of pulleys employed especially for the rigging of ships (a big naval ship of the line used up over 1,000 of these blocks). By the beginning of the new century Brunel had set up a production line at Portsmouth, and, by 1803 was turning out, with 10 unskilled persons, as many blocks as had previously taken 110 expert craftsmen as was employed by the antiquated Southampton factory of Fox & Taylor, who hand made blocks, and who figured they could not be made in any other way. Brunel was to cash in on the Royal Navy's requirement for 100,000 rigging blocks a year.
"What made Brunel's Portsmouth production line unique, however, was not just the inventiveness of the individual machines - though nothing like his mortising machine, the cone-clutch clamps of his hole-boring machine, or the split-nut in the pin-polishing machine, had ever been seen before. The historic novelty was the coordinating of these machines, which had interchangeable parts, into a single production line. Men who had grown old in the trade could not believe their eyes. ...
The Royal Navy used large numbers of blocks, which were all hand-made by contractors. Their quality was not consistent, the supply problematic and they were expensive. A typical ship of the line needed about 1000 blocks of different sizes, and in the course of the year the Navy required over 100,000. Bentham had devised some machines for making blocks, but did not develop them and details of how they worked are now obscure. In 1802 Mark Isambard Brunel proposed to the Admiralty a system of making blocks using machinery he had patented. Bentham appreciated the superiority of Brunel's system and in August 1802 he was authorised by the Admiralty to proceed.
There were three series of block-making machines, each designed to make a range of block sizes. They were laid out to allow a production line, so each stage of the work progressed to the next in a natural flow. The yard between the two wood mill buildings was walled-off and roofed to form a new workshop to house the block-making machines.
The first set, for medium blocks, was installed in January 1803, the second set for smaller blocks in May 1803, and the third set for large blocks in March 1805. There were numerous changes of layout and some modification of the plant until in September 1807 the plant was felt able to fulfil all the needs of the Navy: In 1808 130,000 blocks were produced.
1835 - Samuel Colt removed the waste from reloading as well as interchangeable parts

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