eBook Calculator Calculate Lead Time Williams Optical Inc. is considering a new lean product cell. The present manufacturing approach produces a product in four separate steps. The production batch sizes are 67 units. The process time for each step is as follows: Process Step 1 Process Step 2 Process Step 3 Process Step 4 The time required to move each batch between steps is 11 minutes. In addition, the time to move raw materials to Process Step 1 is also 11 minutes, and the time to move completed units from Process Step 4 to finished goods inventory is 11 minutes. The new lean layout will allow the company to reduce the batch sizes from 67 units tounits. The time required to move each batch between steps and the inventory locations will be reduced to 2 minutes. The processing time in each step will stay the same. Determine the value-added, non-value-added, and total lead times, and the vasie added ratio under the present and proposed production 7 minutes 5 minutes 9 minutes 4 minutes approaches. If required, round percentages to one decimal place. Present Approach Proposed Approach 25 min 25 min Value-added time Non-value-added time Total lead time Value-added ratio (as a percent) min min min min 31.3J x % 71.41 x % 945 AM /27/2018