A transfer machine has six stations that function as follows:

In addition, transfer time = 0.18 min. Average downtime per occurrence = 8.0 min. A total of 20,000 parts must be processed through the transfer machine. Determine
(a) Proportion downtime,
(b) Average actual production rate, and
(c) How many hours of operation are required to produce the 20,000 parts?

Process time 0.78 min 1.25 min 0.90min 0.85 min 1.32 min 0.45 min Station Operation pi 1 Load part 2 Drill three holes 3 Ream two holes 4Tap two holes 5 Mill flats 6 Unload parts 0.02 0.01 0.04 0.01