Joint analysis in rapid fabrication of non‐assembly mechanisms

TLDR: In this paper, the authors developed a systematic method that can minimize joint clearance for non-assembly mechanism fabrication using a layer-based fabrication technology using the Hertz theory to analyze the joint clearance-penetration displacement relationship and the impact force displacement relationship.

Abstract: Purpose – The main purpose of this study is to develop a systematic method that can minimize joint clearance for non‐assembly mechanism fabrication using a layer‐based fabrication technology.Design/methodology/approach – Joint clearance is one of the key factors affecting a mechanism's performance. Hertz theory is adopted to analyze the joint clearance‐penetration displacement relationship and the impact force‐displacement relationship. This analysis has indicated the importance of reducing joint clearance. To reduce joint clearance in layer‐based fabrication, a drum‐shaped roller is proposed for pin joint design in non‐assembly mechanism fabrication. Compared to cylindrical pin joint design, a drum‐shaped roller joint results in less impact force in mechanism operation. Furthermore, the joint clearance can also be drastically reduced.Findings – Large joint clearance could introduce instability into the dynamic behaviour of a mechanism. By applying a drum‐shaped roller, the instability could apparently be...