26 AutoCAD and Its Applications—Advanced Copyright Goodheart-Willcox Co., Inc. After selecting the fi rst corner or center, you are prompted to select the other corner or enter the Cube or Length option. The “other” corner is the opposite corner of the box base if you enter an XY coordinate or the opposite corner of the box if you enter an XYZ coordinate. If the Length option is entered, you are fi rst prompted for the length of one side. If dynamic input is on, you can also specify a rotation angle. After entering the length, you are prompted for the width of the box base. If the Cube option is selected, the length value is applied to all sides of the box. Once the length and width of the base are established, you are prompted for the height, unless the Cube option was selected. Either enter the height or select the 2Point option. This option allows you to pick two points on screen to set the height. The box is created. If the Center option was selected, the height will be applied in both the posi- tive and negative Z directions. PROFESSIONAL TIP PROFESSIONAL TIP Using the UCS icon grips, you can select a surface that is not parallel to the current UCS on which to locate the object. Methods for working with user coordinate systems are discussed in detail in Chapter 4. Exercise 2-1 www.g-wlearning.com/CAD/ Complete the exercise on the companion website. Cone A cone has a circular or elliptical base with edges that converge at a single point. The cone may be truncated so the top is fl at and the cone does not have an apex. See Figure 2-5. When the command is initiated, you are prompted for the center point of the cone base, or to enter an option. If you pick the center, you must then set the radius of the base. To specify a diameter, enter the Diameter option after specifying the center. The 3P, 2P, and Ttr options are used to defi ne a circular base using three points on the circle, two points on the circle, or two points of tangency on the circle and a radius. The Elliptical option is used to create an elliptical base. If the Elliptical option is entered, you are prompted to pick both endpoints of one axis and then one endpoint of the other axis of an ellipse that defi nes the base. If the Center option is entered after the Elliptical option, you are asked to select the center of the ellipse and then pick an endpoint on each of the axes. After the base is defi ned, you are asked to specify a height. You can enter a height or enter the 2Point, Axis endpoint, or Top radius option. The 2Point option is used to set the height by picking two points on screen. The distance between the points is the height. The height is always applied perpendicular to the base. The Axis endpoint option allows you to orient the cone at any angle, regardless of the current UCS. For example, to place a tapered cutout in the end of a block, fi rst create a construction line. Refer to Figure 2-6. Then, locate the cone base and give a coordinate location of the apex, or axis endpoint. You can then subtract the cone from the box to create the tapered hole. The Top radius option allows you to specify the radius of the top of the cone. If this option is not used, the radius is zero, which creates a pointed cone. Setting the radius to a value other than zero produces a frustum cone, or a cone where the top is truncated, and does not come to a point. CONE Ribbon Home Modeling Solid Primitive Cone Type CONE