Calculate Lead Time:

Flint Fabricated Inc. machine metal parts for the automotive industry. Under the traditional manufacturing approach, the parts are machined through two process: milling and finishing. Parts are produced in batch sizes of 65 parts. A part requires 4 minutes in milling and 6 minutes in finishing. The move time between the two operations for a complete batch is 7 minutes.

Under the lean 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 4 parts and the move time is eliminated.

Determine the value added, non-value-added, and the total lead times, and the value -added ratio under the traditional and lean manufacturing methods. If required, round percentages to one decimal.

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). %. %