Question

(a) An overhead trolley conveyor is configured as a continuous closed loop. The delivery loop has a length of 120 m and the return loop 80 m. All parts loaded at the load station are unloaded at the unload station. Each hook on the conveyor can hold one part and the hooks are separated by 4 m. Conveyor speed 1.25 m/s. Determine: (i) maximum number of parts in the conveyor system, (ii) parts flow rate; and (ii) maximum loading and unloading times that are compatible with the operation of the conveyor system? (b) Compute the cycle time and production rate for a single-machine robotic cell for an 8-hour shift if the system availability is 90%. Also determine the percent utilization of machine and robot. On average, the machine takes 30 s to process part. The other robot operation times as follows: Robot picks up a part from the conveyor Robot moves the part to the machine Robot loads the part onto the machine Robot unloads the part to the machine Robot moves to the conveyor Robot puts the part on the outgoing conveyor Robot moves from the output conveyor to the input conveyor 3.0 s 1.3 s 1.0 s 0.7 s 1.5 s 0.5 s 4.0 s

Answer 1