12.2.5 Scales The scales refer to customary and metric mea- surements. This makes the square useful as a rule. Once a measurement is marked, the square can be used to draw a perpendicular line. See Figure 12-17. It can also be used to check the squareness of an assembly. 12.3 Layout Tools Layout tools transfer distances, angles, and con- tours. Most lack scales for measuring distances and angles. These are set with a measuring tool. The fol- lowing descriptions cover common layout tools. 12.3.1 Sliding T-Bevel The sliding T-bevel is used to lay out and trans- fer angles, Figure 12-18. Set the angle of the T-bevel Goodheart-Willcox Publisher Figure 12-15. The brace measure table shows brace lengths. Goodheart-Willcox Publisher Figure 12-16. The octagon scale, found on some framing squares, is a row of numbered dots for laying out octagons. Goodheart-Willcox Publisher Figure 12-14. Use the combination square to complete these tasks. A—Mark parallel lines. B—Find centers. C—Mark angles. 10 9 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 124 9 67 48 48 18 30 24 Diagonal distance Brace length 48 48 67 18 30 1 2 3 4 5 6 7 8 1 2 3 4 5 6 1 2 A C D B h g a b c d f e 28″ 28″ Note: Square and drawing are not the same scale 28 Dots 16THS 16 THS 8THS 5 10 15 20 25 30 12 17 17 09 16 1 / 4 25 5 / 16 11 13 / 16 11 15 / 16 8 THS A B C with a protractor. Loosen the locking device on the handle to move the blade. After setting the proper angle, tighten the locking device. Besides layout, T-bevels can set the angles for table saw blades, jointer fences, and drill press tables. If you are setting 90° angles, use a try square. T-bevels are not as accurate as a square. 12.3.2 Angle Divider An angle divider is a layout tool consisting of two blades that move outward at an equal rate from the body. It is used to bisect angles. The blades move apart from 0° to 90°. If the blades are adjusted Chapter 12 Measuring, Marking, and Laying Out Materials 155 Copyright Goodheart-Willcox Co., Inc.