【正文】
may need to pick up more points, 8 points for instance, on the center lines. (4)曲線的畫法 Drawing a curve 對于圓角、橢圓及圓弧連接,也是盡量利用與正方形、長方形、菱形相切的特點畫出。Try to draw curves by keeping them tangent with some auxiliary squares, rectangles or rhombuses.? 繪制草圖步驟 Steps of freehand sketchinga) 在圖紙上定出各視圖的位置 Decide the positions of views 畫出各視圖的基準線、中心線。安排各視圖的位置時,要考慮到各視圖間應(yīng)有標注尺寸的地方,右下角留有標題欄的位置。Draw base lines and center lines of views. Before doing this, the positions of the views should be decided, with the space left for dimensions and title bar.b) 詳細地畫出所設(shè)計構(gòu)型外部和內(nèi)部的結(jié)構(gòu)形狀。Draw structural shapes in detail.c) 選擇基準和畫尺寸線、尺寸界線及箭頭。過仔細校核后,描深輪廓線,畫好剖面線。Select dimension bases and finish dimensioning. Examine the views and then finish the trace drawing.d) 測量尺寸,定出技術(shù)要求,并將尺寸數(shù)字和相關(guān)技術(shù)要求標注到圖中。Measure the dimensions and decide the technical notes, then label them on the views.