零件圖的尺寸標注ppt課件(參考版)
2025-03-25 05:47本頁面
【正文】 請點擊鼠標左鍵顯示后面內(nèi)容 2 Fixing of bearing bracket 軸承架安裝圖 dimension the drawing of bearing bracket， take the ?、 ??、 ??? as the design datum. 注出 軸承架 全部尺寸 ,已知 ?.??.???為 設計基準 。 2. Fully dimension the drawing of bearing bracket， take the ?、 ??、 ??? as the design datum. 注出 軸承架 全部尺寸 ,已知 ?.??.???為 設計基準 。這樣，就會使加工困難，所以應當避免封閉的尺寸鏈，將一個不重要的尺寸去掉。 Bracket 支架 The center height of the axle hole is an important dimension. So it should be directly specified. 軸孔的中心高是重要尺寸應直接注出 The distance between the The distance between the centers of the two holes on the bottom board should be directly specified for mounting purposes. 底板上兩孔的中心距離應直接注出以方便裝配 Appropriate 標注合理 Inappropriate 標注不合理 As shown in Fig, dimensions A, B ,C and L form a close dimension chain. Since L=A+B+C, if dimension L has a constant error, dimensions for A， B and C must have very little error, which may lead to difficulties in machining. Therefore, close dimension chains should be avoided and the dimension with less importance should be removed. 圖中的尺寸 A、 B、 C和 L 構(gòu)成一個封閉的尺寸鏈。 Determining datum features 尺寸基準的確定 請 點 擊 鼠 標 左 鍵 顯 示 后 面 內(nèi) 容 Datum features 尺寸基準的選擇 This section focuses on some general iss
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