Machine oil is used by clothing manufacturers to lubricate and protect sewing machines. A company that produces machine oil must ensure that the viscosity of its product meets customer requirements. Consequently, the viscosity of every batch of oil produced is measured. Suppose that the process mean is 101 cP and the process standard deviation is 1.50 cP.
a. What type of chart should be used to ensure the process remains in control?
b. Determine the centreline and control limits for this chart.
c. Suppose that customer specifications require viscosity of the machine oil to be 100 cP ± 4.5 cP (i.e., the LSL = 95.5 cP and the USL = 104.5 cP). Calculate both the Cp and Cpk indices and interpret.

Question

Quizplus · Accepted Answer

The Answer of Machine oil is used by clothing manufacturers to lubricate and protect sewing machines. A company that produces machine oil must ensure that the viscosity of its product meets customer requirements. Consequently, the viscosity of every batch of oil produced is measured. Suppose that the process mean is 101 cP and the process standard deviation is 1.50 cP.
a. What type of chart should be used to ensure the process remains in control?
b. Determine the centreline and control limits for this chart.
c. Suppose that customer specifications require viscosity of the machine oil to be 100 cP ± 4.5 cP (i.e., the LSL = 95.5 cP and the USL = 104.5 cP). Calculate both the Cp and Cpk indices and interpret.

Machine Oil Is Used by Clothing Manufacturers to Lubricate and Protect