Bayfield Mud Company

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BAYFIELD MUD COMPANY CASE

Bayfield Mud Company sent its customer service representative, John Wells, to investigate its product sent to Wet-Land Drilling Inc. The problem was 50-pound bags of mud treating agents sent to Wet-Land recently was underweight by 5%. Wet-Land found that the average weight per bag was 47.51 pounds. Normally, net loads average should be 50 pounds per bag with an acceptable standard division of 1.2 pounds. This mistake of Bayfield Mud had the great impact on Wet-Land’s cost. Bayfield Mud Company needed to solve the problem otherwise Wet-Land might find a new supplier.

QUALITY CONTROL OF BAYFIELD

To discover causes of the problem, Bayfield quality control staff randomized 6 bag samples every hour for 3 days, and then setting Mean chart limits or X bar chart, and Rang chart limits or R chart.

X BAR CHART

Bayfield operated 24 hours a day divided into three-shift operation: shift 1 operating from 6.00 am to 2.00 pm., shift 2 from 2.00 pm. to 10.00 pm., and shift 3 from 10.00 pm. to 6.00 am. Using the data Bayfield staff recorded, we find UCL, LCL, and the average mean of the samples below:

Upper control limit (UCL) = 50.59 pounds

Lower control limit (LCL) = 47.66 pounds

Average mean of the 72 samples = 49.13 pounds

Next we plot the chart in order to find whether changes had occurred in the central tendency of the feeding process.

X BAR CHART: DAY 1

X BAR CHART: DAY 2

X BAR CHART: DAY 3

R CHART

Upper control chart limit for the range (UCLR) = 7.48 pounds

Lower control chart limit for the range (LCLR) = 0

Average range of the 72 samples = 3.73

R CHART: DAY 1

R CHART: DAY 2

R CHART: DAY 3

Regarding to the X bar Chart and R-Chart, the Bay...

... middle of paper ...

...4816 0 3.733

7:00 AM 2.1 3 4.9 7.4816 0 3.733

8:00 AM 1.8 3.4 3.8 7.4816 0 3.733

9:00 AM 1.6 2.3 4.6 7.4816 0 3.733

10:00 AM 3.1 2.2 7.1 7.4816 0 3.733

11:00 AM 3.1 3.3 4.6 7.4816 0 3.733

12:00 PM 4.2 3.6 2.2 7.4816 0 3.733

1:00 PM 3.6 4.2 3.6 7.4816 0 3.733

Shift 2 2:00 PM 4.6 2.4 2.6 7.4816 0 3.733

3:00 PM 2.6 4.5 2 7.4816 0 3.733

4:00 PM 3.5 5.6 1.5 7.4816 0 3.733

5:00 PM 5.3 4.9 6 7.4816 0 3.733

6:00 PM 5.5 10.2 5.7 7.4816 0 3.733

7:00 PM 5.6 5.5 5.6 7.4816 0 3.733

8:00 PM 4.6 4.7 2.3 7.4816 0 3.733

9:00 PM 3 4.7 2.3 7.4816 0 3.733

Shift 3 10:00 PM 4.6 3.6 2.6 7.4816 0 3.733

11:00 PM 4.5 3 3.8 7.4816 0 3.733

12:00 AM 4.8 2.2 2.8 7.4816 0 3.733

1:00 AM 5.4 3.3 2.2 7.4816 0 3.733

2:00 AM 5.5 3.2 4.2 7.4816 0 3.733

3:00 AM 3.8 0.8 1.6 7.4816 0 3.733

4:00 AM 3.6 4.2 1 7.4816 0 3.733

5:00 AM 2.5 5.6 1.9 7.4816 0 3.733

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