Bhojraj Fabricators Inc. 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 $30$ parts. A part requires $7$ minutes in milling and $9$ minutes in finishing. The move time between the two operations for a complete batch is $4$ 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 $2$ parts and the move time is eliminated.

Instructions

$($a$)$ Determine the value$-$added, non$-$value$-$added, and total lead times, and the value$-$added ratio under the traditional manufacturing method.

$($b$)$ Determine the value$-$added, non$-$value$-$added, and total lead times, and the value$-$added ratio under the lean manufacturing method.

Round percentages to one decimal place.

NOTE: Enter a number in cells requesting a value; enter either a number or a formula in cells with a $"?".$

$($a$)$

Traditional Philosophy

$($b$)$

Lean Manufacturing Philosophy