Alfreed J

Freelance CAD Designer (3D Prototype Development Project)

Fiverr

Apr 2026 - May 2026 • 1 mo

A Fiverr client approached me with a concept for a mechanical robotic arm prototype that required full CAD development from sketch to assembly-ready model. The initial challenge was incomplete design specifications and unclear motion constraints, which made it difficult to establish accurate kinematic relationships between joints. To resolve this, I initiated a structured requirement breakdown process, converting conceptual sketches into measurable CAD parameters. Using SolidWorks, I built a fully parametric 3D model with defined joint constraints and motion paths. During simulation, I identified torque imbalance issues in the elbow joint assembly that could have caused mechanical instability. I corrected this by redistributing load paths and reinforcing key structural points without increasing overall weight. After iterative refinement, the final output was a fully functional CAD prototype with smooth articulation, production ready files, and optimized assembly logic. The client successfully used the model for early-stage prototyping and investor presentation, significantly improving project credibility and development direction.

Mechanical CAD & Product Development Specialist

Bosch Global

Feb 2026 - Mar 2026 • 1 mo

Collaborated on a precision engineering project focused on developing compact mechanical components for automotive sensor housings at Bosch Global. The main issue encountered was thermal expansion misalignment between plastic enclosures and internal metal mounting structures, which risked long term product failure under operational stress. I conducted a detailed material behavior analysis and redesigned the CAD models to incorporate thermal expansion compensation gaps. Using CATIA and AutoCAD, I refined tolerances, introduced snap fit optimization, and restructured internal support ribs to improve durability without increasing material cost. I also simulated environmental stress conditions to validate design performance. The final design achieved improved structural stability, enhanced heat resistance, and reliable sensor alignment under variable temperature conditions. This reduced prototype rejection rates and improved manufacturing efficiency for downstream production.

CAD Mechanical Design Engineer

Siemens

Jan 2026 - Jan 2026 • 0 mos

Worked on a high precision mechanical assembly redesign project for industrial automation systems at Siemens. The initial challenge was inconsistent part alignment across multi component assemblies, which was causing interference issues during simulated motion analysis. These errors were affecting manufacturability and increasing prototype failure risk. To solve this, I performed a full CAD topology review using SolidWorks and Fusion 360, identifying critical tolerance mismatches in key rotational joints and housing structures. I re-engineered the affected components with corrected dimensional constraints and introduced parametric modeling to ensure adaptive fit across assemblies. Additionally, I optimized the assembly hierarchy to improve simulation accuracy and reduce computational load during stress testing. The final result was a fully optimized CAD assembly with zero interferences, improved mechanical efficiency, and manufacturing-ready documentation. The client achieved smoother prototyping cycles and reduced iteration time significantly, improving overall product development speed.