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Engineering Drawing 25

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Engineering Drawing 25

2. 2. 2 Outline of reading 1.1. Understanding the meaning of individual lines and otherUnderstanding the meaning of individual lines and other drawing elements of the view.drawing elements of the view. (2)(2) Each closed loop of lines/curves represents:Each closed loop of lines/curves represents: (1)(1) Lines and curves (including circular arcs) represent the following:Lines and curves (including circular arcs) represent the following: BB 1) The projection of accumulation planes.1) The projection of accumulation planes. 2) The projection of intersection of two planes.2) The projection of intersection of two planes. 3) The projection of the outline of cylindrical surfaces.3) The projection of the outline of cylindrical surfaces. AA CC 1) The projection of a plane.1) The projection of a plane. 2) The projection of a curved surface.2) The projection of a curved surface. 3) The projection of a curved surface and its tangent plane.3) The projection of a curved surface and its tangent plane. II ⅡⅡ ⅢⅢ
3. 3. 3 Outline of reading 2. Reading several views simultaneously.2. Reading several views simultaneously. One view may not be able to reveal general space shape of composite solidsOne view may not be able to reveal general space shape of composite solids.. Example 1.Example 1. Think of the left view from the given front view.Think of the left view from the given front view.
4. 4. 4 When reading drawings, we should not make a conclusion after reading only one orWhen reading drawings, we should not make a conclusion after reading only one or two views. We should carefully compare all views and make a conclusion until theytwo views. We should carefully compare all views and make a conclusion until they can be fully explained following the principles of projection.can be fully explained following the principles of projection. Example 2.Example 2. Think of the left view from given views.Think of the left view from given views. Outline of reading 2. Reading several views simultaneously.2. Reading several views simultaneously.
5. 5. 5 3.3. Reading starts from a view that most reflects shape characteristics. While reading, we must pay special attention to the character view forWhile reading, we must pay special attention to the character view for identifying the basic shape of the composite solid.identifying the basic shape of the composite solid. 4.4. Analyzing relative position and intersection of neighboring surfaces. Outline of reading While reading, we should also pay attention to relative locations, such asWhile reading, we should also pay attention to relative locations, such as front-and-back, tall-and-low and intersection locations.front-and-back, tall-and-low and intersection locations. Example 3. Think of the solid shape fromfrom the given top view. A B C
7. 7. 7 Example 6. Draw the left view of theExample 6. Draw the left view of the hybrid construction solid.hybrid construction solid. Methods of reading We partition the composite solid into individual boundary surfaces.We partition the composite solid into individual boundary surfaces. We analyze and identify the space shape of the individual surfaces andWe analyze and identify the space shape of the individual surfaces and their relative locations following the principles of projection. We can furthertheir relative locations following the principles of projection. We can further determine intersection curves/lines and their relative locations and finallydetermine intersection curves/lines and their relative locations and finally imagine the overall space shape of the composite solid.imagine the overall space shape of the composite solid. Example 4. Complete the left view by adding the missing detail.Example 4. Complete the left view by adding the missing detail. Example 5. Draw the left view of the subtraction composite solid.Example 5. Draw the left view of the subtraction composite solid. 2. Analysis of lines and planes.
8. 8. 8 Exercises 1.1. Draw the front viewDraw the front view of the composite solidof the composite solid. 5. Select the left view which is correctly drawn. 3.3. Draw the plan viewDraw the plan view of the composite solidof the composite solid. 4. Draw the left4. Draw the left viewview of the composite solidof the composite solid. 6. AnalyzeAnalyze the component using shape method. 2. Draw the plan view2. Draw the plan view of the composite solidof the composite solid.
9. 9. 退出退出前一页前一页
10. 10. 10 点 鼠 左 示后面内容请 击 标 键显点 鼠 左 示后面内容请 击 标 键显 4.4.Complete the left view by adding the missing detail.Complete the left view by adding the missing detail. StepsSteps ： (1)(1) Analyze theAnalyze the component.component. (2)(2) Draw theDraw the missing detail.missing detail.
11. 11. 11 5. Draw the left view of the subtraction composite solid.5. Draw the left view of the subtraction composite solid. StepsSteps ： (1)(1)Construct theConstruct the complete left view.complete left view. (2)(2)It could be obtainedIt could be obtained on the circle followingon the circle following the accumulation.the accumulation. （（ 33 )) Check and drawCheck and draw with regular lines.with regular lines.
12. 12. 12 6. Draw the left view of the6. Draw the left view of the hybrid construction solid.hybrid construction solid. StepStep 11 ：： Analyze of lines and planesAnalyze of lines and planes 最高最高 最高最高稍低稍低 底面底面 更后更后 最后面最后面 再后再后 再后再后 稍前稍前 稍前稍前 最前最前最前 次低次低 （（ On Page23)On Page23) aa ）） Analyze theAnalyze the front view.front view. bb ）） Analyze theAnalyze the top (plane) view.top (plane) view. 次后次后 较后较后
13. 13. 13 易多线易多线 易多线易多线易多线StepStep 22 ：： ConstructionConstruction the third view.the third view. 6. Draw the left view of the6. Draw the left view of the hybrid construction solid.hybrid construction solid.
14. 14. 14 1. Draw the front view1. Draw the front view of the composite solidof the composite solid. (1) (2) (3) (4)
15. 15. 15 2. Draw the plan view2. Draw the plan view of the composite solidof the composite solid. (1) (2) (3) (4)
16. 16. 16 3.3. Draw the plan viewDraw the plan view of the composite solidof the composite solid.
17. 17. 17 4. Draw the left4. Draw the left viewview of the composite solidof the composite solid.
18. 18. 18 （ 1 ） （ 2 ） （） （  ) B A B A B A B A A B C B AC B AC B AC 5. Select the left view which is correctly drawn. Shape and surface analysis
19. 19. 19 （（ 11 ）） Draw the three viewsDraw the three views of shapeof shapeⅠⅠ.. （（ 22 ）） Draw the three viewsDraw the three views of shapeof shape ⅡⅡ.. （（ 33 ）） Draw the three viewsDraw the three views of shapeof shape ⅢⅢ.. （（ 44 ）） Draw the three viewsDraw the three views of shapeof shape ⅣⅣ.. （（ 55 ）） Analyze the construction methodAnalyze the construction method of these drawings.of these drawings. ⅠⅠ,Ⅱ,Ⅱ —————————— ⅡⅡ,Ⅲ,Ⅲ —————————— ⅡⅡ,Ⅳ,Ⅳ —————————— ⅠⅠ,Ⅳ,Ⅳ —————————— （ 6 ） Draw the top view.Draw the top view. Tangency Tangency UnionUnion Intersection 6.6. AnalyzeAnalyze the component using shape analysis method. （（ On page 21On page 21 ））
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