CAD Engineering Design Portfolio

Overview

Completed a portfolio of three computer-aided design projects in AutoCAD during 2024-2025, spanning precision component drawing, mechanical assembly design and consumer product design. All drawings comply with BS 8888 (Technical Product Documentation), ISO 128 (General Principles of Representation) and ASME Y14.5 (GD&T), with proper title blocks, revision clouds and layer management throughout.

Working to these standards for the first time made clear how much information a well-constructed engineering drawing must communicate without ambiguity. Every tolerance zone, every surface finish symbol and every datum reference frame is a specification that a machinist or manufacturer will act on directly. Getting those details right - understanding the difference between bilateral and unilateral tolerances, or why a datum reference frame must be chosen based on the functional requirements of the assembly rather than drawing convenience - was the core learning across all three projects.

The first project produced complete manufacturing documentation for a precision-machined mechanical component: three-view orthographic projections in first-angle projection with full dimensioning, bilateral and unilateral tolerances per ISO 286, geometric tolerancing (flatness, perpendicularity, concentricity) in feature control frames, surface finish symbols with Ra values and a 3D solid model created from base extrude/revolve operations with fillet, chamfer and circular pattern features, rendered with realistic material assignments and three-point lighting.

The second project covered the complete design cycle for a functional mechanical assembly, from functional and environmental specification through detailed drawings. It includes GD&T datum reference frames, form, orientation and location tolerances, material selection rationale (strength-to-weight, machinability, corrosion resistance), section views, an exploded assembly drawing with balloon callouts and a structured BOM with COTS and custom part identification. The third project was a full consumer product design for a hairdryer, covering injection moulding considerations (draft angles, uniform wall thickness, parting line positioning, snap-fit bosses), internal component layout with vibration isolation and thermal management, IEC 60335 safety compliance, exploded view documentation with hierarchical part numbering and step-by-step assembly instructions.

Key highlights

• ·Three projects: precision component, mechanical assembly design cycle and hairdryer product design
• ·Full GD&T: datum reference frames, form, orientation and location tolerances, feature control frames
• ·Tolerancing per ISO 286 with surface finish symbols (Ra values) and machining callouts
• ·Assembly drawings with exploded views, balloon callouts, section views and structured BOM
• ·Consumer product design: injection molding DFM, IEC 60335 compliance, assembly sequence
• ·All drawings comply with BS 8888, ISO 128 and ASME Y14.5 with proper title blocks and revision control

Technologies