### Home > CCA2 > Chapter 12 > Lesson 12.1.3 > Problem 12-51

A glass factory makes a continuous ribbon of glass by pouring a continuous stream of hot liquid silicon on a lake of molten tin. The liquid silicon spreads out evenly on the tin and then cools into glass. It is a process that must continue uninterrupted

Hour | | | | | | | | | | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|

Defects |

Hour | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|

Defects |

Create an

-bar process control chart with a UCL of and an LCL of . Make a graph where the

-axis is Hours, the-axis is Defects.

The-axis should range fromto . What do you notice about the process control chart that might concern you as a quality control engineer?

Answers will vary, but notice that there appears to be a cycle every

hours.