# Object at third angle物体在第一角Third angle projection

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## Presentation Transcript

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Views 视 图 Principle views and directional views 基本视图及向视图 Partial views 局部视图 Oblique views 斜视图 Exercises 练习题请点击相应标题显示其内容

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Principle views and directional views 基本视图及向视图First angle method 第一角画法(E法) Third angle method 第三角画法(A法)请点击鼠标左键显示后面内容First angle symbol 第一角符号Third angle symbol 第三角符号 Principle views: There are six orthographic views when project to six projection planes. 基本视图 分别向六个基本投影面投射,便得到六个基本视图。Front Left TopBottom Rear Right Top Front Right Rear LeftBottom Relative position 相对位置关系:ObserverObjectprojection plane 观察者物体投影面 ObserverTransparent projection plane Object 观察者透明投影面物体 All views must accord with the projection rules and be arranged and meantime the view names needn’t be signed. 各视图之间的位置应符合投影规律,此时一律不标注视图的名称。 Far from front view showed the front side of the object, but third angle on the contrary. 其他视图中远离主视图的一侧,表示物体的前面,而在第三角画法中则表示其后面。

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Principle views and directional views 基本视图及向视图请点击鼠标左键显示后面内容 If the views are not placed following the requirement of orthographic projection, view name “×” must be signed above the view, an arrow is used to show the projective direction in corresponding views, and the same letter must be signed. Such view is called directional view. 向视图:若各视图不按照既定的位置关系配置,应在视图的上方用大写拉丁字母注出视 图名称,在相应视图附近用箭头指明投射方向,并注上同样的字母,该视图称为向视图。Example 1. Draw all projection views in first and third angle. 画出物体的第一、三角基本视图。Example 2. Draw four views in third angle projection. 用第三角画法画出物体的主、俯、左、右侧视图。

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An auxiliary view is projected by using a profile reference plane paralleling the oblique surface that is called oblique view. 斜视图:将机件上的倾斜部分投射到与该部分平行的辅助投影面上而得到的视图。3. oblique views should be placed according to projection rules. It is permitted to rotate oblique views, but it is required to sign the name “×” and the rotation direction “ ”or “ ” . 斜视图应按投射关系配置,若斜视图不画在投射方向延长线上,则应转正画出,并在其上方注明相应大写拉丁字母及旋转方向 或 (旋转角度应小于90°)。1. Arrow signed with letter is used to show the projection direction near the corresponding view and the name “×” should be signed above the oblique view. 用大写拉丁字母和箭头指明表达部位及投 射方向,在斜视图上方注写出相同的字母。　Oblique views　斜视图 Point 作图要点:请点击鼠标左键显示后面内容A字母应保 持垂直不 可倾斜！2. Oblique views can be drawn as partial oblique views to express oblique part forms only, the rupture boundary is expressed by continuous thin irregular line. 斜视图只需表达机件倾斜部分的形状,其断裂边界应以波浪线表示。

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Exercise: Draw those views projection from A、B and C. 画出所给机件的A向、B向局部视图和C向斜视图。BCA将C向视图画在投射方向上将C向视图转正后画在其他位置请 点 击 鼠 标 左 键 显 示 后 面 内 容A

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1. Draw all projection views in first and third angle. 画出第一、三角的所有基本视图。First-angle method 第一角画法(E法) Third-angle method 第三角画法(A法) 请点击鼠标左键显示后面内容

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First and third angle projection 第一、第三角示意图Object at third angle物体在第一角Object at first angle 物体在第三角There are four quadrants in the space 将空间分为四个象限（角）

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First angle projection 第一角投影示意图Object at third angle物体在第一角

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Third angle projection 第三角投影示意图Object at first angle 物体在第三角

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First angle method symbol

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Third angle method symbol

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Last Updated: 8th March 2018