Question: Calculate Lead Time
Michigan Machining Company machines metal parts for the automotive industry. Under the traditional manufacturing approach, the parts are machined through two processes: milling and finishing. Parts are produced in batch sizes of 70 parts. A part requires 3 minutes in milling and 7 minutes in finishing. The move time between the two operations for a complete batch is 8 minutes.
Under the lean manufacturing philosophy, the part is produced in a cell that includes both the milling and finishing operations. The operating time is unchanged; however, the batch size is reduced to 6 parts and the move time is eliminated.
Determine the value-added, non-value-added, and total lead times, and the value-added ratio under the traditional and lean manufacturing methods. If required, round percentages to one decimal place.
|
Traditional Philosophy |
Lean Manufacturing Philosophy |
| Value-added time |
min |
min |
| Non-value-added time |
min |
min |
| Total lead time |
min |
min |
| Value-added ratio (as a percent) |
% |
% |