Lampost Manufacturing provides the following information: To produce a unit of p

Question

Lampost Manufacturing provides the following information:

To produce a unit of product:

Mixing department 4 minutes per unit

Molding department 7 minutes per unit

Casting department 9 minutes per unit

Finishing department 5 minutes per unit

There is a wait time of 5 minutes before the mixing department begins a batch, 5 minutes between the mixing and molding departments, a move and pre-wait between molding and casting of 10 minutes, and a move and pre-wait between the casting and finishing departments of 8 minutes.

Required:

How long does it take to produce a batch of 20 units under a traditional manufacturing approach? (be sure to show all work)

Explanation / Answer

Let the manufacturing process start at t= 0

the time taken for this product for mfg = 4 + 5 + 7 + 10 + 9 + 8 + 5 = 48 min

but at t = 5min second unit manufacture starts

thus second unit is manufactured at time t = 53 min

similarly 19th unit is manufactured at t= 48 * 18*5 = 138 min

Time taken for complete manufacture ( i .e total tym) = 138 + 5 = 143 min

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