Hidden lines in a drawing represent the edges where surfaces meet but are not directly visible. In your example, cl 3, 4 and 5 i would interpret as the centerplanes of the features associated with them. It is a basic requirement and learned early in drafting instruction. This 2010 edition of the west virginia division of highways standard specifications, roads and bridges, has been issued with the intent for use on all projects in which bids are received after november 1, 2010. Engineering drawing course and in minimizing discrepancies prevailing among the. Section 11 general principles of dimensioning on technical drawings. A student skilled with this books drawings will have a full repertoire of graphical skills in his or her hands. Engineering drawing and sketching mit opencourseware.
Line types used in technical drawing are used for different purposes to provide specific information to the people looking at the drawing. A centerline is just a line, it may or may not mean anything. Technical drawing with engineering graphics 15th edition. An example of one of the methods developed to accomplish this task is shown in figure 8. Before we get started on any technical drawings, lets get a good look at this strange block from. Draw 2 lines from midship centerline to the bowdeck fillet edges then join curves. This section provides a tutorial on engineering drawing and sketching. Centerlines chaindotted are used for symmetric objects, and also for the center of circles and holes. A tsquare is a technical drawing instrument primarily used for drawing horizontal lines on a. This drawing is symmetric about the horizontal centerline. In the reading the drawing, clarity dictates that center lines should always be.
A centerline is used to indicate an axis of a symmetrical part. Technical drawing tutorial doug smith memorial university of newfoundland october 18, 2012. Can be used to produce 2d technical drawings but tailored. Wheels built by the pioneers of the wheel industry, the center line name is defined by its foundation of superior quality, excellence of engineering and innovation. Technical drawing with engineering graphics 15th edition by frederick e. When starting a technical drawing, in most cases the first items to be drawn are the centre lines to fix positions of components with in the drawing. Drafting students or those reading the drawings have to learn what they mean, just as one learns a new language. In some cases this method can be clearer than just dimensioning between surfaces. We can dimension directly to the centerline, as in figure 31. Centre lines however can be added at any stage throughout the drawing process depending on the type of drawing being created.
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