My tool my rule:User-Participatory Design of an Angle Grinder

Abstract: As a tool primarily designed for grinding, angle grinders are extensively used by workers in processing and maintenance tasks. However, using angle grinders for cutting purposes is not compliant with safety regulations, yet this practice is widespread. This misuse imposes significant wrist strain and safety hazards on workers. Existing tool designs often prioritize technology or market demands, frequently neglecting workers' needs and considerations for ergonomics and user experience.This study conducted multiple rounds of experiments and collaborated with users to advance a design plan for an angle grinder. We interviewed angle grinder users from various professions and observed their work processes, discovering numerous ergonomic issues in the actual use of angle grinders. Based on the forces exerted during operation, we proposed three new gripping methods to make the angle grinder suitable for both cutting and grinding. These methods were tested with users, leading to the creation of more detailed models to refine the mode-switching mechanism. This iterative process incorporated new user feedback into the design and resulted in the production of a prototype. The prototype was provided to 12 users for evaluation, and the scale results showed that the angle grinder designed with user participation significantly enhanced the user experience compared to traditional angle grinders.Based on this case, we developed a user-centric tool design methodology. This method begins with observing and interviewing users to extract their needs, followed by initial modifications to existing tools and seeking user feedback. The next steps involve integrating this feedback into design and structural development, conducting multiple rounds of discussions with users to adjust the design, and finally inviting users to evaluate the design outcome. Implementing this method requires detailed communication, extensive real-world experiments, and rigorous evaluation and collaborative decision-making. This approach finds a balance between practical conditions and users' ideal usage patterns, leading to more ergonomic design results. It enhances the user experience while providing new insights for designers and engineers.This user-centric design methodology emphasizes deep user involvement throughout the design process. By bridging the gap between actual working conditions and users' needs, it offers a new perspective on tool design that prioritizes ergonomics and user satisfaction. This method can lead to innovative solutions that improve the usability and safety of tools, ultimately benefiting both workers and the design community.

Keywords: User-Centric Design, Ergonomics, Angle Grinder, Tool Safety, User Experience

DOI: 10.54941/ahfe1005610

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