This kind of representation allows avoiding any kind of distortion of lengths. A section is a view of no thickness and shows the outline of the object at the cutting plane. Frequently a threaded section will need to be shown inside a part. Other line styles used to clarify important features on drawings are. The hidden detail is drawn as a thin dashed line. This is the bread and butter of an engineering drawing. One will always reference back to the base view when getting more into detail on the drawing. Visible outlines beyond the cutting plane are not drawn. The simplest form of hatching is usually drawn by continuous thin line at a convenient angle, preferably 45˚ to the principal outlines or lines of symmetry of the sections. Source : http://xa.yimg.com/kq/groups/16377466/592328345/name/Engineering+Drawing+(SI.+T3).doc+manas.doc, Web site link to visit: http://xa.yimg.com, Google key word : Sectional views in engineering technical drawings file type : doc, Author : NTTF Mr. Praveenkumar M Checked by Mr. S.Rao. Thin chain lines are a common feature on engineering drawings used to indicate centre lines. Hatching is generally used to show areas of sections. Thus, a 2D view has to convey everything necessary for part production. Note the conventions. A base view is the starting block of the drawing. Threads are drawn with thin lines as shown in this illustration. These views can have different titles eg. The following figure shows a cutting plane that passes parallel to and through a web (SECTION B-B). The main thing to remember is that this is where it all starts. It is similar to revolved section with revolving the cross section 900. Be sure to also read the article on Sections at this link -> Sections and Section Views on Engineering Drawings. If there is not a need to show a view or it will be duplicating a view that has already been shown elsewhere, there is no need for it on the drawing. Usually, a number of drawings are necessary to completely specify even a simple component. The general recommendations are that thick lines are twice as thick as thin lines. The drawings are linked together by a master drawing or assembly drawing which gives the drawing numbers of the subsequent detailed components, quantities required, construction materials a… It is used when only a portion of the object needs to be sectioned. Generally, three views of an object are prepared. If the plane is kept in a vertical position, then it is called the vertical plane. In the Appearance panel, specify the scale and view style. Ribs, webs, spokes, gear teeth and other thin features are not section lined when the cutting plane passes parallel to the feature. The cut line is called a “cutting plane”, and can be done in several ways. When drawn from end-on, a threaded section is indicated by a broken circle drawn using a thin line. Removed sections are used when there is not enough room on the orthographic view for a revolved section. An orthographic view or orthographic projection is a way of representing a 3D object in 2 dimensions. We use cookies to ensure that we give you the best experience on our website. If you want to quickly find the pages about a particular topic as Sectional views in engineering technical drawings use the following search engine: Sectional views in engineering technical drawings, Larapedia.com Terms of service and privacy page. Where sections of the same part in parallel planes are shown side by side, the hatching shall be identical, but offset along the dividing line between the sections if greater clarity is considered necessary. Sections and sectional views are used to show hidden detail more clearly. Dashed lines are used to show important hidden detail for example wall thickness and holes.. In the case of large areas, the hatching may be limited to a zone following the contour of the hatched area. Projected views are views that are projected from a base view or main views. Click in the drawing area to indicate the location to place the base view and press ENTER. A base view is the starting block of the drawing. In it’s simplest form, a projected view is where you would rotate the part or assembly to show it from a different angle in order to show detail that is on the other faces. A section view is a view used on a drawing to show an area or hidden part of an object by cutting away or removing some of that object. A partial view is a view that is created of a certain portion of a part or assembly. Auxiliary views are used when showing true dimensions of parts that are on an inclined angle. When hatching large areas in order to aid readability, the hatching can be limited to the area near the edges of the part. If more than two parts are adjacent, then the hatching should be staggered to emphasize the fact that these parts are separate. This view will show detail that is hidden inside the part or assembly in order to give dimensional information. When you are hatching an object, but the objects have areas that are separated, all areas of the object should be hatched in the same direction and with the same spacing. When hatching assembled parts, the direction of the hatching should ideally be reversed on adjacent parts. Introduction: Planning your engineering drawing For most engineering drawings you will require two thickness', a thick and thin line. • improve the visualization and clarity of new designs, If you continue to use this site we will assume that you are happy with it. A preview of a projected view appears at the cursor. When placing a base view, this can be the first part of an arrangement (this will normally show the part or assembly as you would see it in real life). It is made by revolving the cross section view of a feature 90° about an axis of revolution and superimposing the section view on the orthographic view. An interrupted view is used where portions of a part or assembly is cut away to show in a more condensed form of that specific view. (B) If the revolved section crosses lines of the view on which it is to be revolved, then the view can be broken for clarity. The cutting plane is indicated on a drawing using the line style used for centre lines, but with a thick line indicating the end of lines and any change in the direction of the cutting plane. Hatching The hatching of adjacent components shall be carried out with different directions or spacing. Adding section lines to these features would give the false impression that the part is thicker than it really is. Conventional view placement The three-view multiview drawing is the standard used in engineering and technology, because many times the other three principal views are mirror images and do not add to the knowledge about the object. There are certain rules when creating projection, so be sure to read the article on projections by following this link -> Differences between First and Third Angle Projections, Sectional views are views that are created by cutting into or through a part or assembly. The direction of the view is indicated by arrows with a reference letter. A sectional view, displays the outline of the cutting plane and all visible outlines which can be seen beyond the cutting plane. (A) If the revolved section view does not interfere or create confusion on the view, then the revolved section is drawn directly on the view using visible lines. In the Orientation panel of the Drawing View Creation contextual ribbon tab, select the orientation for the base view. The technique called section views is a very important aspect of design and documentation, and is used to It is possible for the cutting plane to change directions, to minimize on the number of sectional views required to capture the necessary detail. According to the rule of projection, the horizontal plane is rotated in the clockwise direction. The following figure shows a part with a portion removed or broken away. On sections and sectional views solid area should be hatched to indicate this fact. Before kicking off with the different views, it is worth a mention that the amount of views on a drawing should be minimized as much as possible without affecting the clarity or readability of the drawing. If you are the author of the text above and you not agree to share your knowledge for teaching, research, scholarship (for fair use as indicated in the United States copyrigh low) please send us an e-mail and we will remove your text quickly. 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