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Showing posts from March, 2013

SECTIONAL VIEWS

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What is a sectional views: Although it is imagined that the object is cut by an imaginary section plane its interior construction is viewed by removing the portion of the object between the observer and the section plane while retaining its other portion. Then view of the retained portion of the object exposing its interior construction along with its cut surface is called sectional view. Thus it is a view which not only shows the cut surface of the object but all other its interior details the section plane. How to obtain a sectional view: To obtain a sectional view of an object it should be imagined as though the object is cut by a section plan and the portion of the object between the section plane and the observer is removed as then looking in the direction normal to the section plane the view of the retained portion of the object showing all the other visible details along with the cut surface in drawn as since the process of sectioning is only imaginary all other views

RIVETS AND RIVETED JOINTS

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Riveted joints: In riveted joints were classified as one of the types of permanent fastenings. They are generally used to fasten metal plates and steel section in structural works such as bridge and roof trusses and in the construction of pressure vessels such as storage tanks boilers. The field of application of riveted joints has been considerably reduced by the welded joints because of the simplified process of making the welded joint comparative strength and economy. However riveted joints are very effective in designs subjected to pronounced vibration loads where welded joints are less reliable. Riveted joints may also be employed to connect metals which are difficult to weld together and in the joints which permit no heating welded due to possible tempering or warping of the finished machine parts. Rivet: A rivet is a round rod of either mild steel or nonferrous materials such as copper aluminum with a head of any one of the shapes formed at one end during its manufa