. A control chart for tool wear. A sam-

ple of five units of product is taken from a production process every hour. The following results are obtained.

Assume that the specifications on this quality characteristic are at 1.0015 and 1.0035. Set up the R chart on this process. Set up a control chart to moni- tor the tool wear.

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Sample "Number R 1 1,0020 0.0008 2 1.0022 0.0009 3 1.0025 0.0006 956 1.0028 0.0007 1.0029 0.0005 1.0032 0.0006 Tool Reset 7 1.0018 0.0005 8 1.0021 0.0006 9 1.0024 0.0005 10 1.0026 0.0008 11 1.0029 0.0005 12 1.0031 0.0007