A flexible manufacturing cell consists of a manual load/unload station, three CNC machines, and an automated guided vehicle system (AGVS) with two vehicles. The vehicles deliver parts to the individual machines, drop off the parts, then go perform other work. The workstations are listed in the table below, where the AGVS is listed as station 5.

The FMC is used to machine four work parts. The product mix, routings, and processing times for the parts are presented in the table below:

The mean travel time of the AGVS between any two stations in the FMC is 3 min which includes the time required to transfer loads to and from the stations. Given that the loading on the system is maintained at 10 parts (10 work parts in the system at all times), use the extended bottleneck model to determine
(a) The bottleneck station,
(b) The production rate of the system and the average time to complete a unit of production, and
(c) The overall utilization of the system, not including the AGVS.

Transcribed Image Text:

Station Description Servers 1 Load and unload 1 worker 2 Milling 1 CNC milling machine 1 CNC drill press 1 CNC grinding machine 2 vehicles 3 Drlling 4 Grinding 5 AGVS Part Part mix p Station routing Station Station Station Station Station 1-2-3-4 8 min 7 min 18 n 2 min 1→3→2→1 4min 9min 10 min 0 2min 1→2→4→1 4min 10min 0 14 min 2min D 0.30 12431 4 min mn 12 min 16 mn 2 min 0.25 0.33 0.12 B С