Usually, a number of drawings are necessary to completely specify even a simple component. Frequently a threaded section will need to be shown inside a part. Together we can become better draftsman that add more value to our clients. All the information in our site are given for nonprofit educational purposes. 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. The sectional view uses both thick and thin line with the hatching carrying on to the very edges of the object. The sketch shows where the object is cut. • facilitate the dimensioning of drawings. 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. For mechanical drawings section views are used to reveal interior features of an object that are not easily represented using hidden lines. Hi, I'm Piet and has been a Mechanical Draftsman in the Petrochemical environment since 2008. The cutting plane cuts the object at an angle, but the drawing is rotated for a better view by the observer. Hatching is generally used to show areas of sections. Lines and line styles A sectional view, displays the outline of the cutting plane and all visible outlines which can be seen beyond the cutting plane. The example below shows a pipe being cut by two parallel planes. This is one of a family of three-dimensional views called pictorial drawings. This view will often be enlarged in order to show finer detail that can be dimensioned or annotated. • improve the visualization and clarity of new designs, 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. If more than two parts are adjacent, then the hatching should be staggered to emphasize the fact that these parts are separate. (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. This is the bread and butter of an engineering drawing. The lines we created were all of the same thickness and type. It is important to think about the number of views your drawing will have and how much space you will use of the paper. The example below shows a sectional view of the cutting plane A - A. 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. When hatching assembled parts, the direction of the hatching should ideally be reversed on adjacent parts. A base view is the starting block of the drawing. In the first tutorial we learnt how to create simple shapes using the place line tool. On sections and sectional views solid area should be hatched to indicate this fact. A thin line is used for hatching, leader lines, short centre lines, dimensions and projections. 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. Arrangement, Elevation View, Plan View, Isometric View, etc. A section is a view of no thickness and shows the outline of the object at the cutting plane. Leaving thin feature un sectioned only applies if the cutting plane passes parallel to the feature. Isometric Drawing The representation of the object in figure 2 is called an isometric drawing. Hatching shall be interrupted when it is not possible to place inscriptions outside the hatched area. They are created by using a cutting plane to cut the object. If you are working with inks on film, plan the order in which you are drawing the lines. Differences between First and Third Angle Projections, Sections and Section Views on Engineering Drawings. 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.