Michigan Machining Company machines metal parts for the automotive industry. Und
ID: 2477591 • Letter: M
Question
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 65 parts. A part requires 2 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) % %Explanation / Answer
Total operating time = 2 minutes (in milling) + 7 minutes (in finishing) = 9 minutes
Total move time per batch = 8 minutes
Batch size = 65 parts
Move time per part = 8/65 = .12 minutes
Below table is for per part calculation
Traditional Philosophy Lean manufacturing Philosphy Value added time 9 min 9 min Non value added time 0.12 min 0 min Total lead time 9.12 min 9 min Value added ratio(as%) 98.68 % 100 %