DESIGN OF A COFFEE ROASTING MACHINE USING THE QFD AND VDI 2111 METHODS

Abstract

The design of an effective coffee roasting machine that meets user requirements is essential for improving roasting quality and production efficiency. This study aims to develop a coffee roasting machine by integrating the Quality Function Deployment (QFD) method with the VDI 2111 design guideline as a systematic approach to identifying customer needs and translating them into technical design specifications. Customer requirements processed through QFD revealed several prioritized features, including temperature stability, adequate capacity, operational ease, and user safety. These results were then further developed using the VDI 2111 method to generate a structured design concept consisting of functional analysis, solution principles, and evaluation of alternative designs. The design process produced a coffee roasting machine equipped with a more stable heating system, precise temperature control, an ergonomic frame structure, and a stirring mechanism that ensures uniform roasting. Based on the evaluation, the proposed design is considered capable of improving the roasting process quality while effectively fulfilling key customer needs.