When the revolved view is superimposed on the part, the original lines of the part behind the section are deleted. Lines and line styles One will always reference back to the base view when getting more into detail on the drawing. 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. 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. Sometimes, it is difficult to hatch very thin sections. In some cases, views can either be combined or made separately, depending on the application of the view. Ideally, the view that is created should be shown in line with the direction of view. For most engineering drawings you will require two thickness', a thick and thin line. Always remember that everything on an engineering drawing has a purpose. The example below shows a sectional view of the cutting plane A - A. 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… The example below shows a pipe being cut by two parallel planes. An arrow is used to identify the surface that is looked at. 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. A common use is to specify the geometry necessary for the construction of a component and is called a detail drawing. Centre lines are used to identify the centre of a circle, cylindrical features, or a line of symmetry. Isometric Drawing The representation of the object in figure 2 is called an isometric drawing. A base view is the starting block of the drawing. • facilitate the dimensioning of drawings. 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. (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. It is used when only a portion of the object needs to be sectioned. This should only be used when the wall thickness size is less than 1mm. Removed sections are used when there is not enough room on the orthographic view for a revolved section. Hatching shall be interrupted when it is not possible to place inscriptions outside the hatched area. 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). Before starting your engineering drawing you should plan how you are going to make best use of the space. 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. Leaving thin feature un sectioned only applies if the cutting plane passes parallel to the feature. Did you know, Views are the building blocks of engineering drawings. To emphasize solid wall the walls can be filled in. Without different views, engineering drawings cannot exist, so understanding how views are used on drawings is a critical. Eg: Dimensioning in hatched area: The direction of the view is indicated by arrows with a reference letter. 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. Hatching is generally used to show areas of sections. The following figure shows a cutting plane that passes parallel to and through a web (SECTION B-B). 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. Dimension lines are normally shown outside the drawing, but in some unavoidable cases they can be shown inside the drawing itself. Click in the drawing area to indicate the location to place the base view and press ENTER. Hi, I'm Piet and has been a Mechanical Draftsman in the Petrochemical environment since 2008. On sections and sectional views solid area should be hatched to indicate this fact. In the Orientation panel of the Drawing View Creation contextual ribbon tab, select the orientation for the base view. Separate areas of the section of the same component shall be hatched in an identical manner. The cutting plane cuts the object at an angle, but the drawing is rotated for a better view by the observer. This view will often be enlarged in order to show finer detail that can be dimensioned or annotated. The main thing to remember is that this is where it all starts. The example below shows a simple single plane sectional view where object is cut in half by the cutting plane. Visible outlines beyond the cutting plane are not drawn. If more than two parts are adjacent, then the hatching should be staggered to emphasize the fact that these parts are separate. 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. In the first tutorial we learnt how to create simple shapes using the place line tool. 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. • clarify multi view drawings, 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. It is important to think about the number of views your drawing will have and how much space you will use of the paper. When drawn from end-on, a threaded section is indicated by a broken circle drawn using a thin line. They are created by using a cutting plane to cut the object. A section is a view of no thickness and shows the outline of the object at the cutting plane. The main thing to remember is that this is where it all starts. A thin line is used for hatching, leader lines, short centre lines, dimensions and projections. In the case of large areas, the hatching may be limited to a zone following the contour of the hatched area. It is similar to revolved section with revolving the cross section 900. In this view, the cross-sectional shape of ribs, spokes, and other projections of the object are featured. If the cutting plane passes perpendicular or crosswise to the feature (cutting plane A-A), section lines are added as shown in figure (C). We use cookies to ensure that we give you the best experience on our website. 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.