Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Unit 22 Bending Metal 237 Inside Dimensions To determine fl at-out length of a quarter cylinder when you are given the inside dimensions, calculate the circumference using the inside diameter plus the metal thickness. Then divide the result by four. If the bent piece has legs that extend beyond the quarter cylinder, add the inside lengths to the one-quarter circumfer- ence to fi nd the fl at-out length. 75 mm radius 200 mm 250 mm 2 mm C = π × D π = 3.14 D + thickness = 150 mm + 2 mm = 152 mm Quarter circumference = 3.14 × = 119.32 mm = 119 mm (rounded) 119 mm + 200 mm + 250 mm = 569 mm Flat-out length is 569 mm. 152 mm 4 Goodheart-Willcox Publisher