One last bit of info before we get back to CAD stuff. Since there are 2 kinds of standards, how do you know which is which when you have a drawing in front of you? There is a standard symbol that is used in the title block to indicate which method was used.
This symbol shows a simple cone and displays the projection. Think about which symbol represents which method, then move your mouse over the images to see if you were correct. In the workplace, you might find that you are given a part to measure and then draw, or you might be designing the part yourself.
This is a very simple example to get you used to the concepts. I recommend that you start where you have the most information. This will sometimes be the front or the top — it depends upon each drawing. In this case, I will start with the front and draw it. Ok, this should have been easy enough, so now you can start drawing the top view. Draw lines up from the main points in your front view.
Now that you have the vertical lines, draw the horizontal lines. Now you almost have 2 views drawn. Trim the lines so that you are left with just the lines you need. Read Tutorials to learn about Linetypes, because you will need them here. After reading the tutorial, return to your drawing and load the Hidden and Center linetypes. These are needed to add more information in your drawing. If all went well, you should be able to load the linetypes and scale them LTS with a value of 10 or 12 to fit with your drawing.
What you see above is the completed Top and Front views. They are there to indicate that the hole circle is drilled right through the block.
Where would the lines be in the hole was only drilled half way through? The center lines are used to show the the hole and the arc have the same center point. These are both common and standard CAD methods and you need to understand them. Unless otherwise specified; front, top, and right side views should be selected for the description of models and pictures. An intersection of two surfaces, edges of surfaces and the surface limits should be shown by using full lines while the hidden features are to be shown by dashed lines.
Each view must contain all the lines of the object, both visible and hidden. The centre lines of holes, cylindrical parts of objects must be clearly indicated.
The centre of a circle is shown as the intersection of two mutually perpendicular centre lines. For parts with an axis, such as a cylinder or a cone, the axis is drawn as the centre line. If a hidden edge coincides with a visible edge, draw the full line. When a centre line coincides with a hidden edge, draw a dashed line. Orthographic drawings display two-dimensional views of piping, valves, equipment, and structural steel in Plant 3D models.
The drawings can have annotations, dimensions, matchlines plan view only , pipe gaps, and can show or hide lines and objects. Here is an example showing a single view. You can set up a customized template for orthographic drawings with a title block, or you can use the default template. For the third angle projection , the object is placed below and behind the viewing planes meaning the plane of projection is between the observer and the object.
Typically, an orthographic projection drawing consists of three different views : a front view , a top view , and a side view. Occasionally, more views are used for clarity. The side view is usually the right side, but if the left side is used, it is noted in the drawing. These include the Frontal Plane , Profile Plane , and Horizontal Plane : In addition to this, if a plane is placed at any other place, then it is called Auxiliary Plane. These are used to draw inclined surfaces of an object.
They differ only in the position of the plan, front and side views. Below is an example of First Angle projection. Opposite is a simple L-shape, drawn in three dimensions. An orthographic projection or orthogonal projection is a two-dimensional drawing used to represent a three dimensional object. An orthographic view represents the exact shape of an object seen from one side at a time as you look perpendicularly at the object without showing depth of the object.
Orthographic projection is the representation most commonly used by engineers. Orthogonal views provide a means for describing the exact size and shape of an object. To completely define an object , at least two orthographic views are required.
Depending on the complexity of the part, three or more views are required. Third Angle projection is a method of orthographic projection which is a technique in portraying a 3D design using a series of 2D views. Click VIEW2 the side view to use it as a parent view.
Move the preview to the upper-middle of the drawing sheet. Right-click and select Create. To edit the projected view properties, right-click inside the projected view, and select Edit View.
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