Introduction
Two-dimensional technical drawings have been integral to engineering processes long before the advent of the printing press. According to Interesting Engineering, perspective drawing dates back to the 1300s. Early technical drawings for manufacturing were perspective sketches of real objects. The development of descriptive geometry (1765) and orthographic projection (1770) centuries later revolutionized the ability of engineers to visually represent their ideas. Until the emergence of 3D CAD modeling in the 1980s, 2D technical drawings remained the primary method for documenting engineering designs.
The Shift to CAD-Driven Manufacturing
Today, most projects are designed directly as 3D CAD models. Manufacturers rely on digital tools to generate commands for computer-controlled machinery, such as CNC machines or 3D printers. Software like CAM (Computer-Aided Manufacturing) uses these 3D models to create precise toolpaths and movements for the production process.
In modern workflows, technical drawings are often secondary, serving as reference materials rather than the definitive manufacturing guide. Many standard dimensions or features might not even appear on the drawing, as it is assumed that the 3D CAD model will provide the necessary guidance for features and dimensions omitted from the print. This shift underscores the central role of 3D modeling in driving today’s manufacturing processes.
The Role of Technical Prints in Modern Manufacturing
The omission of non-critical measurements on modern technical prints highlights a significant shift in manufacturing practices. Traditionally, technical drawings were considered the authoritative source, with CAD files serving as supplementary references. Today, this hierarchy has reversed—CAD models now take precedence, with technical prints playing a supporting role. In cases where discrepancies arise between a CAD model and a drawing, the CAD model is typically treated as the definitive guide.
How to Create a Technical Print from Scratch
Despite this shift, technical drawings remain vital documents in manufacturing. They provide essential details for machine cuts, forming processes, and critical features during production. Any ambiguity or error in a drawing can result in costly rework, wasted materials, or delays in project timelines.
Machine shops often decline jobs with poorly prepared drawings that lack necessary dimensions, unclear design elements, or inadequate detailing. When working with manufacturers or through a shop consolidator platform, poorly prepared prints can lead to prolonged communication and delays, as all parties must clarify and resolve issues before proceeding with production.
Creating accurate, well-detailed technical prints is essential to ensure smooth manufacturing and avoid unnecessary complications.
