A computer-aided single machine batch scheduling system

This paper describes a computer-based single machine scheduling system for use with a computer numerical control (CNC) bar machine. The system, using a series of scheduling rules, schedules work which is inputted from a data-base. The scheduling algorithm sequences batches of work so that the changeover time is minimised, with the constraint that the machine is fully loaded (when work is available) during the normal three shift working day, including an unmanned nightshift. The schedule generated is a feasible solution. Experience in using the system is described along with the obstacles and benefits. Also outlined are the problems encountered when the CNC bar machine was operated on an unmanned night shift and the effect of these problems on scheduling efficiency and machine utilisation.