機(jī)械類車床外文翻譯-預(yù)覽頁(yè)
【正文】 straightgrained sapling. The system today is called the spring pole lathe. Spring pole lathes were in mon use into the early 20th Century. A twoperson lathe, called a great lathe, allowed a piece to turn continuously (like today39。s wheel. Most suitably equipped metalworking lathes can also be used to produce most solids of revolution, plane surfaces and screw threads or helices. Ornamental lathes can produce threedimensional solids of incredible plexity. The material is held in place by either one or two centers, at least one of which can be moved horizontally to acmodate varying material lengths. Examples of objects that can be produced on a lathe include cue sticks, table legs, bowls, baseball bats, crankshafts and camshafts. History The lathe is an ancient tool, dating at least to the Egyptians ， and known and used in Greece, the Roman and Byzantine Empires. The origin of turning dates to around 1300BC when the Egyptians first developed a twoperson lathe. One person would turn the wood workpiece with a rope while the other used a sharp tool to cut shapes in the wood. The Romans improved the Egyptian design with the addition of a turning bow. Early bow lathes were also developed and used in Germany, France and Britain. In the Middle Ages a pedal replaced handoperated turning, freeing both the craftsman39。s lathes are metal, jeweler39。車床可用于陶器 成形 ，最有名的設(shè)計(jì)是陶輪。 可由車床生產(chǎn)的實(shí)物例子包含細(xì) 棒， 桌 腿，碗，棒球棍，曲 軸和凸輪軸。羅馬人改進(jìn)了埃及 人 的設(shè)計(jì)， 他添 加了一個(gè) 車削的弓形部件 。今天該系統(tǒng)被稱為 “反彈 桿 ” 車床。 在工業(yè)革命 期間， 車床是 機(jī)動(dòng) 化 的 ， 它讓木料在更短的時(shí)間內(nèi)變成實(shí)物 ，并允許金屬 在 車床 上加工 。一些小車床 就被放在工 作臺(tái)或桌上 ，并沒(méi)有 支撐架 。 這個(gè) 啟閉包含高精確度旋轉(zhuǎn)軸承。主軸受驅(qū)動(dòng)，傳遞動(dòng)力給工件。 工件 也許是用螺栓扣住或用螺絲擰緊在 面板 上 ， 一塊 大 的 平板架 固定在主 軸 上 。一塊邊緣有洞的圓形金屬板固定在主軸上，被稱為“索引模塊”。其結(jié)果是工件的各種截面是旋轉(zhuǎn)對(duì)稱的，但整個(gè)工件不是旋轉(zhuǎn)對(duì)稱的。兩個(gè)主軸孔大小的工件用夾頭夾住是很常見(jiàn)的，即六毫米和八毫米，兩種模式的基座是常見(jiàn)的： Webster Whitb 基座，一個(gè)截 短的三棱鏡（只在八毫米的鐘表制造車床上發(fā)現(xiàn)）；和大陸右旋風(fēng)格的柜臺(tái)式基座。 全自動(dòng)機(jī)械車床，采用 一系列的 凸輪和齒輪控制運(yùn)動(dòng)，被稱為螺桿機(jī)。車床配備了索引板，剖面刀，螺旋或螺旋指南等，以便使人觀賞車削的是一種觀賞性的車床。
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