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SolidWorks 2010- P9: Whether you are a new user of SolidWorks or a professional who wants to improve your skills, this book was written for you. Learning any software can be difficult at times. You launch the software for the first time, and you feel overwhelmed, not knowing how to even start a new document. In 3D CAD programs, it can be especially difficult. Many times a whole new vocabulary and a whole new creative environment are introduced. | Dimension Sketches with Centerlines 209 Dimension Sketches with Centerlines By now you have surely become comfortable with adding dimensions to fully define sketches. Now it is time to introduce another cool dimensioning trick with sketches. As you know clicking two points or sketch segments will define the distance between the two entities. But since your sketch has a centerline that represents the axis of revolution for the part you can use that centerline to define the diameter of the part even though only half is shown in the sketch. This is a great way to control the design intent of the part since you are probably more apt to require the diameter controlled rather than the radius. Specifying the diameter of a sketch feature is extremely easy if you already know how to add a dimension as you will see in the following steps 1. Select Smart Dimension in the shortcut bar. 2. Select the vertical centerline and then select the short vertical segment at the bottom of the sketch. 3. The dimension placement is important for how you want to define the sketch. On one side of the centerline the dimension will be the distance from the centerline to the sketch segment or the radius of the shaft see Figure 5.9 . FIGURE 5.9 Defining the radius of a part 4. Move the mouse pointer to the other side of the centerline and the dimension changes to show the diameter of the shaft. With the 2 1 0 Chapter 5 Creating a Revolved Part dimension showing the diameter click and release the left mouse button to place the dimension see Figure 5.10 . FIGURE 5.10 Defining the diameter of a part 5. In the Modify window make the diameter 1.000 and click the green check mark. 6. Making a dimension a diameter also works with points on the sketch. With the Dimension tool still active select the centerline again and select the undefined endpoint of the small arc as shown in Figure 5.11. FIGURE 5.11 Defining the diameter from a point on the sketch 7. Move the mouse pointer to the opposite side of the
