Evaluation of Material Handling Workers Using Snook’s Table: A Case Study

Abstract

Material handling presents numerous occupational hazards for workers, with the efficient transfer of heavy items being essential for operational efficiency. Precise execution of tasks according to industry standards is paramount to maintaining product quality and minimizing defects. However, workers' adoption of awkward postures can adversely affect their health and hinder their ability to meet company targets. Originally focused on determining safe lifting limits, Snook's Table has evolved into a comprehensive tool for assessing ergonomic risks associated with various manual tasks. Its adaptation to changing workplace dynamics underscores its importance in promoting workers’ health and safety. In this study, Snook’s Table was employed to evaluate workers’ posture, distinguishing between healthy and awkward stances. A risk index was provided, where scores exceeding 1.0 indicated high-risk conditions. Eight workers were assessed across pulling, pushing, lifting, and carrying activities. The results revealed that 5 workers exceeded the 1.0 risk index in pushing activities, while none surpassed it in pulling tasks. However, 6 workers scored more than 1.0 in lifting and carrying activities, indicating potential risks associated with these tasks. To mitigate such risks, aided tools like trolleys can improve the Snook’s Table index and prevent awkward postures. Additionally, the 3D Static Strength Prediction Program (3DSSPP) evaluates postural balance to enhance worker safety. Improving postures and utilizing aided tools not only reduces the risk of worker injuries but also enhances work effectiveness. By addressing ergonomic concerns and implementing preventive measures, companies can create safer work environments while optimizing productivity.