英语演讲稿6篇
dear teacher and clamates:
i am very glad to make a speech here in this cla again! this time, i\'d like to talk something about english.i love english.english language is now used everywhere in the world.it has bee the most mon language on internet and for international trade.learning english makes me confident and brings me great pleasure.when i was seven, my mother sent me to an english school.at there, i played games and sang english songs with other children .then i discovered the beauty of the language, and began my colorful dream in the english world.everyday, i read english following the tapes.sometimes, i watch english cartoons.on the weekend, i often go to the english corner.by talking with different people there, i have made more and more friends as well as improved my oral english.i hope i can travel around the world someday.i want to go to america to visit washington monument, because the president washington is my idol.of course, i want to go to london too, because england is where english language developed.if i can ride my bike in cambridge university, i will be very happy.i hope i can speak english with everyone in the world.i\'ll introduce china to them, such as the great wall,
the forbidden city and anshan.i know, rome was not built in a day.i believe that after continuous hard study, one day i can speak english very well.if you want to be loved, you should learn to love and be lovable.so i believe as i love english everyday , it will love me too. that, you feel as i do with it.from school to the present, i am most impreed by the school is the cherry tree in front of trees and the edge of the tree small tree.that little tree is my first year in the guard when the old man saw the seeds of, and now that it has added a six-ring, and the cherry tree has witneed its growth.we like the little tree, and the cus is the cherry trees, is not it? watching all the cus, is so familiar with, can not help but brought back memories of my ......remember that second-grade \"61\" children\'s day, the school playground is now only one-third of the ground but not the plastic cement, as a result of the auction would be too crowded, i was squeezing the students fell.only heard \"jenna\" and say, i fall on the cement floor, and when i difficult to climb up from, it was found that the skin of the left knee has been frayed, blood flow quickly out, i slowly walked to the claroom, continue to spread the pain.at this time, met a lot of students said: \"funny, how the?\" \"oh, you knee the frayed, tease, how to engage in, to, paper towels, put the stone around the wound erase it!\" \"oh, quick to the health room! \"bork, bork, bork concerned with the students asked me.later, i was with a group of well-intentioned arm mounted x school went to the health room, xu teachers to help me carefully cleaning the wound, the medicine, i grinned in pain呲you want to cry, to fort students, i hold back the tears.although not to the activities of the afternoon, and can only stay in the
claroom, but my heart is still full and happy! remember the tug-of-war a year ago, the decider in the final, we lost the power of the second seeded player disparityanimation 早在1831年，法国人joseph antoine plateau把画好的图片按照顺序放在一部机器的圆盘上，圆盘可以在机器的带动下转动。这部机器还有一个观察窗，用来观看活动图片效果。在机器的带动下，圆盘低速旋转。圆盘上的图片也随着圆盘旋转。从观察窗看过去，图片似乎动了起来，形成动的画面，这就是原始动画的雏形。
as early as 1831, the french joseph antoine plateau in order to draw a good picture on a machine in accordance with the disc, the disc can be driven by rotation of the machine.this machine also has an observation window to watch the activities of picture effects.the machine, driven by low-speed rotating disk.the picture on the disc along with the disk rotation.from the observation window at the past, pictures seem to move together to form a moving picture, which is the prototype of the original animation.1909年，美国人winsor mccray用一万张图片表现一段动画故事，这是迄今为止世界上公认的 of mature, people have started to make sense of the performance of various elements of the cartoon.1926年 万氏兄弟成功的发展了中国 the workpiece to create an object which has symmetry[\'simitri] (对称) about an axis of rotation.（center lathe，vertical lathe）
4、history the lathe is an ancient tool, dating at least to ancient egypt [\'i:d?ipt] and known and used in ayria [?\'siri?] and ancient greece [ɡri:s].
the origin [\'?rid?in, \'?:-] of turning dates to around 1300 bc when the ancient [\'ein??nt] egyptians [i:\'d?ip??nz] first developed a two-person lathe.（one person would turn the wood work piece with a rope while the other used a sharp tool to cut shapes in the wood.） ancient rome improved the egyptian design with the addition of a turning bow.in the middle ages a pedal replaced hand-operated turning, （freeing both the craftsman\'s hands to hold the woodturning tools.the pedal was usually connected to a pole, often a straight-grained sapling.） the system today is called the \"spring pole\" lathe.spring pole lathes were in mon use into the early 20th century.during the industrial revolution, mechanized [\'mek?naizd] power generated by water wheels or steam engines was transmitted to the lathe via line shafting,( allowing faster and easier work.metalworking lathes evolved into heavier machines with thicker, more rigid parts.) between the late 19th and mid-20th centuries, individual electric motors [\'m?ut?] at each lathe replaced line shafting as the power source.beginning in the 1950s, servomechanism[,s?:v?u\'mek?niz?m, \'s?:v?u,me-] (伺服机构) were applied to the control of lathes and other machine tools via numerical control, (which often was coupled with puters to yield puterized numerical control.)
today manually controlled and cnc lathes coexist（共存） in the manufacturing industries [\'ind?stri].
5、description：parts explanation of the standard ponents of most lathes: ? bed床身: usually made of cast iron.provides a heavy rigid frame on which all the main ponents are mounted.? ways床身导轨: inner and outer guide rails that are precision machined parallel to aure accuracy of movement.? headstock[\'hedst?k]床头箱，主轴箱: mounted in a fixed position on the inner ways, usually at the left end.using a chuck, it rotates the work.? gearbox ①齿轮箱②变速器: inside the headstock, providing multiple speeds with a geometric ratio by moving levers.? spindle[\'spindl]心轴，主轴: hole through the headstock to which bar stock can be fed, which allows shafts that are up to 2 times the length between lathe centers to be worked on one end at a time.? chuck卡盘: 3-jaw (self centering) or 4-jaw (independent) to cl part being machined.? chuck: allows the mounting of difficult workpieces that are not round, square or triangular.? tailstock尾架: fits on the inner ways of the bed and can slide towards any position the headstock to fit the length of the work piece.an optional taper turning attachment would be mounted to it.
? tailstock quill[kwil]尾架套管: has a morse taper to hold a lathe center, drill bit or other tool.? carriage托架，滑动架: moves on the outer ways.used for mounting and moving most the cutting tools.? cro slide横刀架，横拖板，横溜板: mounted on the traverse slide of the carriage, and uses a handwheel to feed tools into the workpiece.? tool post刀架，刀座: to mount tool holders in which the cutting bits are cled.? pound rest复式刀架: mounted to the cro slide, it pivots around the tool post.? apron[\'eipr?n]床鞍: attached to the front of the carriage, it has the mechanism and controls for moving the carriage and cro slide.? feed rod进给杆: has a keyway, with two reversing pinion gears, either of which can be meshed with the mating bevel gear to forward or reverse the carriage using a clutch.? lead screw丝杠: for cutting threads.? split nut开合螺母: when closed around the lead screw, the carriage is driven along by direct drive without using a clutch.? quick change gearbox快换齿轮箱: controls the movement of the carriage using levers.? steady rest固定中心架: cled to the lathe ways, it uses adjustable fingers to contact the workpiece and align it.can be used in place of tailstock or in the middle to support long or unstable parts being machined.? follow rest跟刀架: bolted to the lathe carriage, it uses adjustable
fingers to bear against the workpiece opposite the cutting tool to prevent deflection.6~
9、description：acceories [?k\'ses?ri] three-jaw [d??:] chuck [t??k]: self-centering three-jaw chuck and key with one jaw removed and inverted showing the teeth that engage in the scroll plate.the scroll plate is rotated within the chuck body by the key, the scroll engages the teeth on the underside of the jaws which moves the three jaws in unison, to tighten or release the workpiece.four-jaw chuck :independent four-jaw chuck, also known as a universal chuck, with the jaws independently set.the key is used to adjust each jaw separately.collet弹性夹头: a collet [\'k?lit] is a holding device—specifically, a subtype of chuck—that forms a collar around the object to be held and exerts a strong cling force on the object when it is tightened, usually by means of a tapered outer collar.it may be used to hold a workpiece or a tool.faceplate花盘: a lathe faceplate is the basic workholding acceory for a wood or metal turning lathe.it is a circular metal (usually cast iron) plate which fixes to the end of the lathe spindle.the workpiece is then cled to the faceplate, typically using t-nuts in slots in the faceplate, or le monly threaded holes in the faceplate itself.dead center死顶尖: dead center (the conical piece) mounted in the spindle of a lathe and being used to support a workpiece being driven by a carrier setup live center活顶尖:a live center or revolving center is
constructed so that the 60° center runs in its own bearings and is used at the non-driven or tailstock end of a machine.[2] it allows higher turning speeds without the need for separate lubrication [,lu:bri\'kei??n], and also greater cling preures.lathe carrier[\'k?ri?]车床鸡心夹头: a lathe dog, also known as a lathe carrier, is a device that cls around the workpiece and allows the rotary motion of the machine\'s spindle to be transmitted to the workpiece.mandrel[\'m?ndr?l]心轴: an object used to shape machined work.
10、application lathes are used in woodturning, metalworking, metal spinning（旋压）, and gla-working.lathes can be used to shape pottery, the best-known design being the potter\'s wheel陶车.most suitably equipped metalworking lathes can also be used to produce most solids of revolution, plane surfaces and screw threads or helices.ornamental [,?:n?\'ment?l] lathes can produce three-dimensional solids（实体）of incredible plexity
11、exles of work produced from a lathe
12、thank you! i`m very happy to have this opptunity to give you a talk.today,my topic is lathe.i know many of you are familiar with this topic can you hear me clearly? i think ti would be best to start out by looking at the picture on the screen
i would like to talk about first is the definition of the lathe question [\'kwest??n] that is all,thank you very much do you have any questions? please show me your hand.who else? i think we have time for just one more question
