A worker assignment for machine cluster in the
manufacturing cell was discussed in this paper. The
objective of this paper is two folds. First, it aims to
demonstrate a calculation of the maximum number of
machines which one worker can optimally operate without
an idle time on the machine. Then, the simulation software
program is utilized to evaluate various proposed
improvement alternatives based on maximum machine
efficiency criteria. In this study one of the hard disk drive
manufacturers in Thailand was explored. Previously, one
worker was assigned to service eight semi-automated
machines in the cluster. The main tasks of the worker were
loading, checking and recording.