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عدد المساهمات : 18959 التقييم : 35383 تاريخ التسجيل : 01/07/2009 الدولة : مصر العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
| موضوع: محاضرة بعنوان Orthographic Projections الجمعة 08 يوليو 2022, 11:32 pm | |
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أخواني في الله أحضرت لكم محاضرة بعنوان Orthographic Projections By Dr. Akhilesh Kumar Maurya
و المحتوى كما يلي :
Orthographic Projections NOTATIONS Types of views View comparison PLANES PATTERN OF PLANES & VIEWS (First Angle Method) rojection systems 1. First angle system 2. Third angle system Views arrangement Methods of Orthogonal Projection 1. Natural Method: Revolve the object with respect to observer 2. Glass box method: The observer moves around the object Glass box : Revolution of the planes of projection Relative orientation of views Summary : Problem solving steps Steps for Orthographic Views iew selection procedures 1. Orient the object to the best position relative to a glass box. 2. Select the front view. 3. Select adjacent views. Suggestions: Orient the object 1. The object should be placed in its natural position. NO ! 2. The orthographic views should represent the true size and true shape of an object (as much as possible). Suggestions: Select the front view 1. The longest dimension of an object should be presented as a width (in a front view). First choice Inappropriate Second choice Good Use more spaceInappropriate 2. The adjacent views project from the selected front view should be appeared in a natural position. Suggestions: Select the front view3. It has the fewest number of hidden lines. Good Inappropriate Suggestions: Select the front viewSuggestions: Select an adjacent view Inappropriate Inappropriate 1. Choose the view that has the fewest number of hidden lines.2. Choose the minimum number of views that can represent the major features of the object. Necessary Necessary Hole’s information is placed on a separated view. Suggestions: Select an adjacent view All information is placed on a single view.3. Choose the views that are suitable to a drawing sheet. Good Suggestions: Select an adjacent view Poor Not enough space for dimensioning. Choose another adjacent view. Change orientation of the Good selected views.Summary View selection has 3 steps Orient the object Select front view Select adjacent viewsObject that requires only one-view Flat (thin) part having a uniform thickness such as a gasket, sheet metal etc. Adjacent views provide only a part’s thickness ! 1 Thick Cylindrical-shaped part. ExampleRepeat ! Infer from CL Object that requires only one-view Example Example Flat (thin) part having a uniform thickness such as a gasket, sheet metal etc. Cylindrical-shaped part.Identical adjacent view exists. Repeat ! Object that requires only two-view The 3rd view has no significant contours of the object. (provides no additional information) ExampleObject that requires only two-view Identical view exists. Example 1 The 3rd view has no significant contours of the object. (provides no additional information)Object that requires only two-view Identical view exists. Example 2 The 3rd view has no significant contours of the object. (provides no additional information)Example-1 ■ Identify surfaces perpendicular or inclined to the view ■ Surfaces parallel to the view would not be visible in that view. ■ First draw horizontal and vertical reference planes (easily identifiable on drawing) ■ Start drawing from the reference planes. Steps to draw projectionsTop view Horizontal reference plane (HP) Vertical reference plane (VP)HP VP Front view Side view Top view Midpoint Front view Side view Top view Front View Top View L.h.side View For T.v. Pictorial Presentation Is Given Draw Three Views of This Object By First Angle Projection Method Orthographic Projections Example-2for T.v. Orthographic Projections Front View Top View L.h.side View X Y Pictorial Presentation Is Given Draw Three Views of This Object By First Angle Projection Method Example-3for T.v. Orthographic Projections Front View Top View L.h.side View X Y Pictorial Presentation Is Given Draw Three Views of This Object By First Angle Projection Method Example-4front View Top View L.h.side View X Y For T.v. Orthographic Projections Pictorial Presentation Is Given Draw Three Views of This Object By First Angle Projection Method Example-5for T.v. Orthographic Projections Front View Top View L.h.side View X Y Pictorial Presentation Is Given Draw Three Views of This Object By First Angle Projection Method Example-6example-7 Pictorial Presentation Is Given Draw Fv and Tv of This Object By First Angle Projection Method Orthographic Projections Example-8 All Views Identical For T.v. Pictorial Presentation Is Given Draw Three Views of This Object By First Angle Projection Method 14 Orthographic Projectionsx Y All Views Identical For T.v. Pictorial Presentation Is Given Draw Three Views of This Object By First Angle Projection Method Orthographic Projectionsfor T.v. Pictorial Presentation Is Given Draw Three Views of This Object By First Angle Projection Method Orthographic Projections Pictorial Presentation Is Given Draw Fv and Tv of This Object By First Angle Projection Method Orthographic Projections Top View Example-11450 For T.v. Pictorial Presentation Is Given Draw Fv and Tv of This Object By First Angle Projection Method Example-12 Orthographic Projectionslsv Pictorial Presentation Is Given Draw Fv and Lsv of This Object By First Angle Projection Method Orthographic Projections Example-13for T.v. Pictorial Presentation Is Given Draw Three Views of This Object By First Angle Projection Method Orthographic Projections Front View Top View L.h.side View
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