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(OD X PI) - 3X Material Thickness

3" Outside Diameter
2" Tall
.004" Thick

Find the Flat Layout

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(OD X PI) - 3X Material Thickness
6" Outside Diameter
4" Tall
1/16" Thick Sheet Metal

6X3.14= 18.84
.0625X3= .1875
18.84 - .1875= 18.65

Flat Layout: 18.65"X4"X.0625

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"Ceres hygienic dryer for coated RTE cereal products." Home. - BUHLERGROUP.com. N.p., n.d. Web. 11 Jan. 2017.

DiY, Muscle Car. "Automotive Welding: How to Cut and Grind - Part 4." Muscle Car DIY. N.p., 14 Feb. 2015. Web. 11 Jan. 2017.

"How to Develop the Blank Flat Length for a Cylinder." The Chicago Curve. N.p., 12 June 2016. Web. 11 Jan. 2017.

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This formula is not attributed to anyone, and has been used for the past 40 years at the company I work for, Buhler Areoglide. The formula is used to construct any cylinders and cones on the industrial dryers we build.

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The formula to construct a cylinder is:
(OD X PI) - 3X Material Thickness
OD: outside diameter
PI: 3.14