Question

An automatic lathe produces rollers for roller bearings, and the process is monitored by statistical process control charts.

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Answer #1

Answer:

UCL_R = 0.63 mm, LCL_R = 0.00 mm

Explanation:

Sample Size n = 5

Mean Range (R-bar) = 0.3 mm

For 3-sigma limits, value of factors

for n=5, D3 =0, D4 =2.114

UCL_R = D4*R-bar = 2.114 * 0.3 = 0.6342 ~ 0.63 mm

LCL_R = D3*R-bar = 0*0.3 = 0.00 mm

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