
74 ◾ Lean Production Simplified, Third Edition
Capacity = Operational time per shift ÷ (Process time + Setup time/interval)
Setup time refers to the time required to change from one machine setting
to another. Setup for a punch press might include changing the die, adjust-
ing the machine settings, and loading a new coil of steel. The interval refers
to the frequency of setup in terms of number of parts.
Figure4.2
18
shows an actual chart. The production capacity of the drilling
machine used in process 2 may be calculated as follows:
◾ Operational time = 460 minutes per shift (27,600 seconds)
◾ Process time = 24 seconds per part
◾ Time needed ...