Laying Out a Circle with Trammel Points To lay out a circle with trammel points: 1. Adjust the points to the desired radius with a rule. 2. Hold one steel point of the trammel at the center of the circle. 3. Swing the other trammel point in an arc to mark the circle on the material, Figure 12-26B. Procedure 12.3.5 Trammel Points Trammel points are used for making large cir- cles and arcs. Two steel points are clamped on a rect- angular piece of lumber. See Figure 12-26A. Some have a point that can be replaced with a pencil. This allows you to mark the wood with either a pencil mark or a scratch. The size of the circle is limited only by the length of wood you choose for the points to slide on. 12.3.6 Profile Gauge A profile gauge is used to copy irregular shapes. See Figure 12-27. Press it against a curved surface. This causes individual pieces of wire or plastic to slide. Once shaped, the contour can be transferred to a pattern, paper, or the material to be cut. Goodheart-Willcox Publisher Figure 12-25. A—Place and swing the compass on the center point of the circle or arc. B—Use the divider to step off measurements. 1 2 3 4 The Fine Tool Shops Goodheart-Willcox Publisher Figure 12-26. A—Clamp trammel points to a piece of wood. B—Use to lay out circles larger than are possible with a compass. A B B A Chapter 12 Measuring, Marking, and Laying Out Materials 159 Copyright Goodheart-Willcox Co., Inc.