Relative Coordinate entry is simply specifying the next point as it relates to your previously defined point whether you picked a point with the cursor or you entered a specific coordinate. this is because when DYN (dynamic input) is turned on it changes how absolute and relative coordinates are entered. Note the all of the Drafting Setting toggles are turned off. Note that the coordinates that are shown in the lower left of the screen (status bar) displays the coordinates of your cursor. Use the picture below to work through the use of using absolute coordinates to create the shape that is shown. This position is called the “World coordinates.”Ībsolute Coordinates let you type in a specific X and Y location on the construction plane. Oddly enough, the UCS icon does have permanant position that it can always be re-positioned to. But for the purposes of learning the basics of coordinates, this post will treat the UCS icon as a static object in a permanent position. This icon can be manipulated (moved and rotated) such that the origin point moves.
The origin is marked by an object known as the UCS icon UCS = User Coordinate System. The origin point (0,0) indicates where the two axes intersect. The X value of the cartesian coordinate specifies the horizontal distance, and the Y value specifies the vertical distance.
The construction plane is similar to a flat sheet of grid paper. In 2D, you specify points on the XY plane, also called the construction plane. When you enter coordinate values, you indicate a point’s distance (in units) and its direction (- or +) along the X, Y and Z axes relative to the coordinate system origin (0,0,0). You can enter two-dimensional coordinates as either Cartesian (X,Y) or polar coordinates.Ī Cartesian coordinate system has three axes X, Y, and Z. “When a command prompts you for a point, you can use the pointing device to specify a point, or you can enter a value on the command line. These fundamentals are a good reminder for all drafters at any level so I think that covering these topics will be a good thing.īelow is an excerpt from the AutoCAD 2002 user’s guide pg# 176-183 Teaching this class should help me focus on some of the more fundamentals of AutoCAD that I have usually not bothered to post here on the blog. I have started teaching AutoCAD for a local community college at night and it has been very demanding of my time. Note: I must first apologize for the lack of posts lately.
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