The workflow in Inventor sketching is substantially different from that in traditional AutoCAD, even beyond dimensions. In Inventor, you create sketches in 2D and then add geometric constraints such as Horizontal, Vertical, Parallel, and so on, to further define the sketch entities. Adding the geometric constraints allows line work to adjust in a predictable and desired manner and helps control the overall shape of the sketch. Once geometric constraints are in place, you add parametric driving dimensions to the sketch geometry. By changing the value of these driving dimensions, you change or drive the size of the sketch object. Because ofthis, the Inventor dimension is far more powerful than the standard AutoCAD dimension because it not only conveys the value of a feature or part but also serves as a design parameter, allowing you to change the dimension to update the design. This is done simply by double-clickingthe dimension and typing in a new value. Figure 1 shows a dimension being edited in a sketch on the left and the result on the right.




Figure 1: Editing Inventor sketch dimensions

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