工程制圖開(kāi)放實(shí)驗(yàn)二指導(dǎo)書(shū)(參考版)
2025-01-18 03:29本頁(yè)面
【正文】 Select dimension bases and finish dimensioning. Examine the views and then finish the trace drawing.d） 測(cè)量尺寸，定出技術(shù)要求，并將尺寸數(shù)字和相關(guān)技術(shù)要求標(biāo)注到圖中。Draw structural shapes in detail.c） 選擇基準(zhǔn)和畫(huà)尺寸線、尺寸界線及箭頭。安排各視圖的位置時(shí)，要考慮到各視圖間應(yīng)有標(biāo)注尺寸的地方，右下角留有標(biāo)題欄的位置。If a circle is large, one may need to pick up more points, 8 points for instance, on the center lines. （4）曲線的畫(huà)法 Drawing a curve 對(duì)于圓角、橢圓及圓弧連接，也是盡量利用與正方形、長(zhǎng)方形、菱形相切的特點(diǎn)畫(huà)出。Generally, the moving direction of the pencil is from the top down for a vertical line while from the left rightward for a horizontal line. For an oblique line, one can turn the paper so that the movement of the wrist is fortable during drawing. When draw a short line, only wrist needs to move, while for a long line, wrist have to move together with the arm. In order to control the scale properly, squared paper can be used.（3）圓的畫(huà)法 drawing a circle 畫(huà)圓時(shí)，應(yīng)先定圓心位置，過(guò)圓心畫(huà)對(duì)稱(chēng)中心線，在對(duì)稱(chēng)中心
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