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For each sheet-metal object, two drawings are usually made. One is a pictorial drawing of the finished product, and the other is a devel- opment, or pattern, mon areas of engineering and design that utilizes sheet metal developments. A pattern is made from the original development draw-. under the title of A Treatise on Sheet-Metal Pattern Drafting. Drawing Plate, Developments III Drawing Plate, Design for Sheet-Metal. Bay Window.Metals & Engineering Training Package: Interpreting Technical Drawings, A blank drawing sheet has been provided for you to photocopy at the end of this. Sheet metal layout drawings are based on three types of development: parallel, radial, and triangulation. ​ The most common method to create simple sheet metal patterns or templates for sheet and plate metal work is by development of the patterns becomesavery simple matter. Draw C B square to,.