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When a machine designer requires a gear when designing a new machine, there are two possibilities: designing the new gear itself, and utilizing a standard gear which has already been designed. Includes access to AutoCAD for Mac, AutoCAD Architecture, Electrical, Mechanical, Map3D, MEP, Plant 3D and AutoCAD Raster Design. This second chapter of IronCAD Essentials covers all the steps to build a Stirling Engine, putting in practice all the concepts learned in IronCAD Online Training Level 1. A gear drawing is a type of important technical reference required when designing machines.