電大CAD計(jì)算機(jī)繪圖本實(shí)驗(yàn)1小抄參考

1、專業(yè)好文檔天津廣播電視大學(xué)工程高級技校實(shí)驗(yàn)報(bào)告課程名稱計(jì)算機(jī)繪圖實(shí)驗(yàn)題目橢圓軸測圖姓名學(xué)號年級10秋專業(yè)名稱機(jī)械設(shè)計(jì)制造及自動(dòng)化層次本科實(shí)驗(yàn)時(shí)間2011924實(shí)驗(yàn)成績實(shí)驗(yàn)教師簽字一、 實(shí)驗(yàn)?zāi)康?通過實(shí)驗(yàn)掌握autocad2000基礎(chǔ)操作，同時(shí)掌握cad繪圖方法。二、 實(shí)驗(yàn)內(nèi)容與要求在機(jī)械零件的軸測視圖中，圓是以橢圓表示的，可分為三個(gè)方向（見圖1），橢圓的長短軸之比為12.2：7，這是一個(gè)常數(shù)，必須記著！用這種比例的橢圓所繪軸測圖最為真實(shí)，相當(dāng)于三維效果。其余尺寸按實(shí)際尺寸繪制！圖1三、實(shí)驗(yàn)過程、數(shù)據(jù)記錄和有關(guān)計(jì)算主要繪圖步驟如下：1、 先繪一10圓的橢圓（見圖3），此后繪圖中可縮放成不同直徑的

2、圓的橢圓。很方便的技巧喲！此后繪圖中，需要用到橢圓時(shí)，請復(fù)制第一步中的橢圓進(jìn)行縮放和旋轉(zhuǎn)。圖32、 按制圖規(guī)律，確定一條軸線（見圖4）圖43、 復(fù)制一橢圓到軸線的端點(diǎn)（見圖5）圖54、 先按內(nèi)孔尺寸28放大橢圓（即放大2.8倍）（見圖6）圖65、 重復(fù)步驟3，復(fù)制一橢圓至軸線端點(diǎn)（見圖7）jurcad/3d/photoshop教程、資源網(wǎng)圖76、 按外徑尺寸68放大橢圓（即放大6.8倍）（見圖8）jurcad/3d/photoshop教程、資源網(wǎng)圖87、 畫零件的厚度10（=12.5-2.5）.只需將兩橢圓沿軸線放向移動(dòng)10（見圖9）即可（先選擇，再點(diǎn)擊移動(dòng)按鈕，再輸入距離數(shù)據(jù)），作外圓的切線

3、，如圖，先畫出橢圓的長軸，再向另一橢圓引切線。jurcad/3d/photoshop教程、資源網(wǎng)圖98、 剪掉多余的線條或不可視的線條（見圖10）jurcad/3d/photoshop教程、資源網(wǎng)9、 重復(fù)步驟3，復(fù)制橢圓至圖示位置（偏移10之后的圓心），作零件左端的臺階，注：有可能是不可見的線，其實(shí)根據(jù)經(jīng)驗(yàn)可以判斷出是不可見的。不可見之線是不用繪出的。（見圖11）jurcad/3d/photoshop教程、資源網(wǎng)圖1110、 按圖尺寸42放大，并偏移2.5.注：如果左端臺階不可見，則不必畫出。圖示紅線橢圓即零件左端的臺階，不可見而被刪除。（見圖12）jurcad/3d/photoshop教程

4、、資源網(wǎng)圖12if we dont do that it will go on and go on. we have to stop it; we need the courage to do it.his comments came hours after fifa vice-president jeffrey webb - also in london for the fas celebrations - said he wanted to meet ivory coast international toure to discuss his complaint.cska general

5、director roman babaev says the matter has been exaggerated by the ivorian and the british media.blatter, 77, said: it has been decided by the fifa congress that it is a nonsense for racism to be dealt with with fines. you can always find money from somebody to pay them.it is a nonsense to have match

6、es played without spectators because it is against the spirit of football and against the visiting team. it is all nonsense.we can do something better to fight racism and discrimination.this is one of the villains we have today in our game. but it is only with harsh sanctions that racism and discrim

7、ination can be washed out of football.the (lack of) air up there watch mcayman islands-based webb, the head of fifas anti-racism taskforce, is in london for the football associations 150th anniversary celebrations and will attend citys premier league match at chelsea on sunday.i am going to be at th

8、e match tomorrow and i have asked to meet yaya toure, he told bbc sport.for me its about how he felt and i would like to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedings against cskafor the racist behaviour of their fans duringcitys 2-1 win.michel platin

9、i, president of european footballs governing body, has also ordered an immediate investigation into the referees actions.cska said they were surprised and disappointed by toures complaint. in a statement the russian side added: we found no racist insults from fans of cska.baumgartner the disappointi

10、ng news: mission aborted.the supersonic descent could happen as early as sunda.the weather plays an important role in this mission. starting at the ground, conditions have to be very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. the balloon, with capsule at

11、tached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. it will climb higher than the tip of mount everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and in

12、to the stratosphere. as he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.the balloon will slowly drift to the edge of space at 120,000 feet ( then, i would assume, he will slowly step out onto something resembling an olympic diving platform.below, the earth beco

13、mes the concrete bottom of a swimming pool that he wants to land on, but not too hard. still, hell be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. it will be like he is diving into the shallow end.skydiver preps for the big jumpwhen he jumps, he is

14、 expected to reach the speed of sound - 690 mph (1,110 kph) - in less than 40 seconds. like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to earth. but this will not be enough to stop him completely.if he goes too fast or spins out of control, he has

15、a stabilization parachute that can be deployed to slow him down. his team hopes its not needed. instead, he plans to deploy his 270-square-foot (25-square-meter) main chute at an altitude of around 5,000 feet (1,524 meters).in order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). he will have a reserve parachute that will open automatically if he loses conscio