Class Problem $[40$pts$]|$teams of up to $4]$

A manufacturing line consists of $4$ separate processes. The arrival mean is based on Takt time. Assume no scrap, blocking, transport times, setup times. All times in minutes.

$10pts$ Which operation is the main bottleneck process for the line? Is variability increased or decreased downstream from it$?$ Explain the rationale for your answer.

$[15$pts$]$ Calculate $C{V}_e,{}_e,$ and $C{V}_d$ for $OP1.$ You may use the spreadsheet to confirm, but must show work.

$[15$pts$]$ It is desired to reduce flowtime and WIP for the system significantly. There are four alternatives, each of approximately equal cost:

a$.$ OP$4$ and OP$2$ positions can be swapped on the line

b$.$ The processing time standard deviation of $OP2$ can be reduced by $\frac{1}{2}.$

c$.$ OP$2$ processing time can be reduced to $1\mathrm{.}65$

d$.$ The MTTF of OP$2$ can be extended to $200$ hours.

Which option should be selected? Justify your answer. Use the spreadsheet.

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Dequitment of Merturieat and Industrial Inginecting

Lean Mernufacturing Systeins $($ID$1530)$

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