Michigan Machining Company machines metal parts for the automotive industry. Und
ID: 2372489 • 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 60 parts. A part requires 5 minutes in milling and 7 minutes in finishing. The move time between the two operations for a complete batch is 10 minutes.
Under the just-in-time 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 5 parts and the move time is eliminated.
Determine the value-added, non-value-added, total lead time, and the value-added ratio under the traditional and just-in-time manufacturing methods. If required, round percentages to one decimal place.
A)
Traditional Philosophy
1. Value-added time _________ min
2. Non-value-added time ________ min
3. Total lead time _________ min
4. Value-added ratio (as a percent) _______ %
B)
Just-in-Time Philosophy
1. Value-added time _________ min
2. Non-value-added time ________ min
3. Total lead time _________ min
4. Value-added ratio (as a percent) _______ %
Explanation / Answer
Value Added time = Milling time + finishing time
Non-Value Added time = Value Added time X (Batch size - 1) + Move time
Lead time = Value Added time + Non-Value Added time
Traditional Philosophy
Value Added time = Milling + finishing time = 5+7 = 12 minutes
Non-Value Added time = Value Added time X (Batch size - 1) + Move time = 12*(60-1) + 10 = 718 minutes
Lead time = 12 + 718 = 730 minutes
Value-Added Ratio = Value Added time / Lead time = 12 / 730 = 1.6%
Just-In-Time Philosophy
Value Added time = Milling time + finishing time = 5+7 = 12 minutes
Non-Value Added time = Value Added time X (Batch size - 1) + Move time = 12*(5-1) + 0 = 48 minutes
Lead time = 12 + 48 = 60 minutes
Value-Added Ratio = Value Added time / Lead time = 12 / 60 = 20%
Traditional Philosophy Just-In-Time Philosophy Value-added time 12 min 12 min Non-value-added time 718 min 48 min Total lead time 730 min 60 min Value-added ratio (as a percent) 1.6% 20%