Auxiliary views are used when showing true dimensions of parts that are on an inclined angle. On sections and sectional views solid area should be hatched to indicate this fact. 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… 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. (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. A preview of a projected view appears at the cursor. However dimension is to be drawn on the hatched area, the hatching lines are broken at the place where dimension value is to be written. Generally, three views of an object are prepared. 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. Separate areas of the section of the same component shall be hatched in an identical manner. These views can have different titles eg. Differences between First and Third Angle Projections, Sections and Section Views on Engineering Drawings. In short, it could save space or it enables a larger view for more detailed information. When the revolved view is superimposed on the part, the original lines of the part behind the section are deleted. This view will show detail that is hidden inside the part or assembly in order to give dimensional information. These views can have different titles eg. 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. Spacing between the hatching lines should be chosen in proportion to the size of the hatched areas. When hatching assembled parts, the direction of the hatching should ideally be reversed on adjacent parts. The cutting plane cuts the object at an angle, but the drawing is rotated for a better view by the observer. 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. Click in the drawing area to indicate the location to place the base view and press ENTER. The direction of the view is indicated by arrows with a reference letter. Hatching is drawn with a thin continuous line, equally spaced (preferably about 4mm apart, though never less than 1mm) and preferably at an angle of 45 degrees. If more than two parts are adjacent, then the hatching should be staggered to emphasize the fact that these parts are separate. 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. A "revolving view" is effective for elongated objects or the elongated section of an object. In the case of large areas, the hatching may be limited to a zone following the contour of the hatched area. Visible outlines beyond the cutting plane are not drawn. 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. When hatching large areas in order to aid readability, the hatching can be limited to the area near the edges of the part. Thin wall sections
Always remember that everything on an engineering drawing has a purpose. Half sections are commonly used to show both the internal and outside view of symmetrical objects. Note the conventions. These are Top View, Front View, and Side View. 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. If the plane is kept in a vertical position, then it is called the vertical plane. In the Orientation panel of the Drawing View Creation contextual ribbon tab, select the orientation for the base view. Hatching shall be interrupted when it is not possible to place inscriptions outside the hatched area. The following slides will help show the several methods or types of “section views” Visualizing the Cutting Plane One will always reference back to the base view when getting more into detail on the drawing. Before starting your engineering drawing you should plan how you are going to make best use of the space. Isometric Drawing The representation of the object in figure 2 is called an isometric drawing. Removed sections are used when there is not enough room on the orthographic view for a revolved section. In the first tutorial we learnt how to create simple shapes using the place line tool. The hidden detail is drawn as a thin dashed line. Hatching is generally used to show areas of sections. Sections and sectional views are used to show hidden detail more clearly. 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). A thick continuous line is used for visible edges and outlines. The example below shows a simple single plane sectional view where object is cut in half by the cutting plane. The parts that are cut away normally has no relevance to the view and it is used to enable a larger representation of the detail that must be shown. Other line styles used to clarify important features on drawings are. The lines we created were all of the same thickness and type. Thin chain lines are a common feature on engineering drawings used to indicate centre lines. Dimension lines are normally shown outside the drawing, but in some unavoidable cases they can be shown inside the drawing itself. 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. It is similar to revolved section with revolving the cross section 900. Arrangement, Elevation View, Plan View, Isometric View, etc. In this view, the cross-sectional shape of ribs, spokes, and other projections of the object are featured. Drawing Front and Top View in First Angle Projection To draw front and top views, object front and top views are projected on vertical and horizontal planes respectively. They are created by using a cutting plane to cut the object. For most engineering drawings you will require two thickness', a thick and thin line. The main thing to remember is that this is where it all starts. 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. Lines and line styles
⢠clarify multi view drawings,
⢠facilitate the dimensioning of drawings. Visible outlines beyond the cutting plane are not drawn. The sectional view uses both thick and thin line with the hatching carrying on to the very edges of the object. Eg: Dimensioning in hatched area:
Hatching
The standard views used in a three-view drawing are the top… If the plane is kept in a horizontal position, then it is called the horizontal plane. The following figure shows a part with a portion removed or broken away. Centre lines will be covered in a little bit more detail later in this tutorial. Sometimes, it is difficult to hatch very thin sections. The general recommendations are that thick lines are twice as thick as thin lines. Centre lines are used to identify the centre of a circle, cylindrical features, or a line of symmetry. Thus, a 2D view has to convey everything necessary for part production. In an isometric drawing, the object's vertical lines are drawn vertically, and the horizontal lines in the width and depth planes are shown at 30 degrees to the horizontal. Usually, a number of drawings are necessary to completely specify even a simple component. According to the rule of projection, the horizontal plane is rotated in the clockwise direction. The main thing to remember is that this is where it all starts.