A professional who develops detailed design drawings and related specifications of mechanical equipment, according to engineering sketches and design proposal specifications. Responsibilities include:

• Analyzes engineering sketches, specifications, and related data and drawings to determine design factors, such as size, shape, and arrangement of parts.
• Sketches rough layout of machine and computes angles, weights, surface areas, dimensions, radii, clearances, tolerances, leverages, and location of holes.
• Computes magnitude, direction, and point of application of tension, compression, and bending forces, and develops geometric shape of machine parts to accommodate operating loads.
• Drafts detailed multiview drawings of machine and subassemblies, including specifications for gear ratios, bearing loads, and direction of moving parts, using engineering data and standard references.
• Compiles and analyzes test data to determine effect of machine design on various factors, such as temperature, pressures, speed, horsepower, and fuel consumption.
• Modifies machine design to correct operating deficiencies or to reduce production problems.
• May measure machine and parts during production to ensure compliance with design specifications, using precision measuring instruments.
• May specialize in specific type of machine, such as air-cooled internal combustion engines, diesel engines, or machine tools.
• May use computer-assisted design/drafting equipment and software to develop designs.