Question

The following information relates to Lancashire Manufacturing:

To produce a unit of product:

Mixing department	3 minutes per unit
Molding department	5 minutes per unit
Casting department	7 minutes per unit
Finishing department	4 minutes per unit

There is a wait time of 8 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 12 minutes.

How long does it take to produce a batch of 20 units under a traditional manufacturing approach?

a.415 minutes

b.35 minutes

c.380 minutes

d.None of these choices are correct.

The following information relates to Cranmore Manufacturing:

To produce a unit of product:

Cutting department	5 minutes per unit
Welding department	8 minutes per unit
Polishing department	3 minutes per unit
Finishing department	4 minutes per unit

There is a wait time of 5 minutes before the cutting department begins a batch, 15 minutes between the cutting and welding departments, a move and pre-wait between welding and polishing of 12 minutes, and a move and pre-wait between the polishing and finishing departments of 8 minutes.

What is the cycle time of operation?

a.20 minutes

b.60 minutes

c.35 minutes

d.16 minutes

Answer 1

SOLUTION

Question -1

Option A is correct i.e. 415 minutes.

To produce a unit of product-

Mixing department	3 minutes
Molding department	5 minutes
Casting department	7 minutes
Finishing department	4 minutes
Total	19 minutes

Time taken for 20 units = 19 minutes * 20 = 380 minutes

Time taken between departments for a batch-

Mixing Department	8 minutes
Mixing and Molding	5 minutes
Molding and Casting	10 minutes
Casting and Finishing	12 minutes
Total	35 minutes

Total Time taken for a batch of 20 units = 380 + 35 = 415 minutes

Question -2

Option B is correct i.e. 60 minutes.

Process time = Cutting department + Welding department + Polishing department + Finishing department

= 5 minutes per unit + 8 minutes per unit + 3 minutes per unit + 4 minutes per unit

= 20 minutes per unit

Wait time = 5 + 15 = 20

Move time = 12 + 8 = 20

Cycle time = 20 + 20 + 20 = 60 minutes