工程制圖開(kāi)放實(shí)驗(yàn)二指導(dǎo)書(編輯修改稿)
2025-02-11 03:29 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 ign, technological exchange and so on.? 畫草圖的要求是 Requirements（1）畫線要穩(wěn)，圖線要清晰；Lines should be clear。（2）目測(cè)尺寸要盡量準(zhǔn)，各部分比例勻稱；Sizes obtained by ocular estimate method should be exact and parts should be shapely.（3）繪圖速度要快；Drawing speed should be fast.（4）標(biāo)注尺寸無(wú)誤，書寫清楚。Dimensions should be correct and clear.? 徒手繪圖方法 Skills要畫好草圖，必須掌握徒手繪制各種線條的基本手法。Some basic skills of freehand sketching should be mastered.（1）握筆方法 the way of holding pencil 手握筆的位置要比用儀器繪圖時(shí)高些，以利運(yùn)筆和觀察目標(biāo)。筆桿與紙面45186。~60186。角，執(zhí)筆穩(wěn)而有力。The pencil should be hold tightly the holding position should be higher than drawing tools. The angle between the penholder and the paper is 45186。~60186。.（2）直線的畫法 drawing a straight line 畫直線時(shí)，手腕靠著紙面，沿著畫線方向移動(dòng)，保持圖線穩(wěn)直。眼要注意終點(diǎn)方向。 When draw a straight line, put the wrist on the paper and move along the line, keeping the line straight. 畫垂直線時(shí)自上而下運(yùn)筆；畫水平線自左而右的畫線方向最為順手，這時(shí)圖紙可放斜；斜線一般不太好畫，故畫圖時(shí)可以轉(zhuǎn)動(dòng)圖紙，使欲畫的斜線正好
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