Alibre Design

Chapter 4 - SketchingTwo types of dimension states exist: driving and driven. Driving dimensions are usedto define and constrain a figure. After driving dimensions have been placed on a figure,driven dimensions can also be added that are dependent upon the values of the drivingdimensions. By default, driven dimensions are displayed in parentheses. Drivendimensions cannot be edited since they are dependent on driving dimensions.Subsequent changes to driving dimensions automatically update the driven dimensions.In the figure below, the 2.000 and .750 dimensions are driving dimensions, and the1.250 dimension is a driven dimension (noted by parentheses). If the 2.000 or .750dimension was changed, then the 1.250 dimension would automatically update as well.4.7.1 Dimensioning Sketch FiguresLinear, radial, diametrical and angular dimensions may be created. Linear dimensionsmay be placed on a line, between two parallel lines, or between nodes. Diameter andradius dimensions may be created for circles and arcs. Angular dimensions may becreated between two non-parallel lines.‣ To dimension individual figures:Follow the steps below to place length dimensions on lines, and diameter dimensions onarcs and circles.1. Select the Dimension tool from the Sketching toolbar; or from the Sketchmenu, select Dimension; or right-click in the work area and select Dimensionfrom the pop-up menu.2. Move the cursor over the figure you want to dimension. The figure is highlighted.3. Click the figure to show a preview of the dimension. Move the cursor to move thedimension preview.96