Prof. Fandel: Chapter 16: Quality Control and SPC
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| show | A task to ensure that a good or service conforms to specifications and meets customer requirements by monitoring and measuring processes and making any necessary adjustments to maintain a specified level of performance.
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| show | If a defect or error is identified and corrected in the design stage, it might cost $1 to fix. If it is first detected during the prod. process, it might cost $10. However, if the defect is not discovered until it reaches the customer, it might cost $100.
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| Quality at the Source | show 🗑
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| Statistical Process Control (SPC) | show 🗑
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| show | The result of complex interactions of variations in materials, tools, machines, information, workers, and the environment.
*Accounts for 80 to 95 percent of the observed variation in process.
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| T/F: Only Management has the power to change systems and infrastructure that cause common cause variation. | show 🗑
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| Special (assignable) Cause Variation | show 🗑
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| show | FALSE. Both front-line employees and supervisors have the power ti identify and solve special causes of variation.
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| A process is in control: | show 🗑
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| A process is out of control: | show 🗑
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| show | 1) Adjusting a process that is already in control.
2) Failing to correct a process that is out of control.
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| show | One that is calculated from data that are measured as the degree of conformance to a specification on a continuous scale of measurement.
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| Discrete Metric | show 🗑
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| A process is said to be "in control" when the control chart has the following characteristics: | show 🗑
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| show | TRUE.
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| show | Samples should be close enough to provide opportunity to detect changes in process characteristics as soon as possible and reduce the chances of producing a large amount of nonconforming output.
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| show | FALSE. Large samples on a frequent basis are normally not economical.
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| C-chart | show 🗑
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| c is the average number of nonconformances/unit. Control limits are given by: | show 🗑
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| T/F: SPC is a useful methodology for process that operate at a high sigma level (Greater than 3-sigma). | show 🗑
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| show | TRUE.
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| Process Capability | show 🗑
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| Process Capability Study | show 🗑
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| Process Capability Index | show 🗑
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| show | Cp = (USL -LSL)/6σ
USL = Upper specification limit
LSL = Lower specification limit
σ = standard deviation of the process
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| show | Customer requirements, as expressed in the customers own terms.
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| Quality Function Deployment (QFD) | show 🗑
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| T/F: QFD translates customer wants and needs into technical requirements of a product or service. | show 🗑
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