Sheetmetal.me
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Reference site from Innovated Metal Fabrication explaining core sheet metal formulas, including bend allowance, bend deduction, setback, K-factor, and Y-factor, plus tooling terminology, a gauge chart, and design-for-manufacturability guidelines. Helps learners calculate flat patterns for bent parts.
More resources on Sheet Metal Work
The Fabricator
Online edition of the trade magazine published by the Fabricators & Manufacturers Association, with technical articles on press brake bending, laser cutting, punching, welding, and shop management. Keeps fabricators current on sheet metal processes, equipment, and practical troubleshooting.
Steelworker, Volume 2 (NAVEDTRA 14251)
U.S. Navy nonresident training manual covering layout and fabrication of sheet metal duct, structural steel and pipe, plus rigging, reinforcing steel and shop tools. The single best free text match for this topic's stated scope: Chapter 2 is layout and fabrication of sheet metal, Chapter 3 is structural steel terms plus layout and fabrication of structural steel and pipe. It teaches parallel-line and radial-line pattern development, structural shape designation, fit-up and assembly sequence - not a summary or listicle. Public domain, 416 pages, with pattern development and structural-shape terminology worked step by step.