An eight-station rotary indexing machine performs the machining operations shown in the accompanying table, together with processing times and breakdown frequencies for each station. The transfer time for the machine is 0.15 min per cycle. A study of the system was undertaken, during which time 2000 parts were completed. It was determined in this study that when breakdowns occur, it takes an average of 7.0 min to make repairs and get the system operating again. For the study period, determine
(a) Average actual production rate,
(b) Line uptime efficiency, and
(c) How many hours were required to produce the 2000 parts?

Station Process Process time Breakdowns Load part Mill top Mill sides Drill two holes Ream two holes Drill six holes Tap six holes Unload part 0.50 min 0.85 min 1.10 min 0.60 min 0.43 min 0.92 min 0.75 min 0.40 min 31 4 84