# Content By Steve Wise

By: Steve Wise

Determining an effective in-process sampling strategy can be a tricky business. What should you measure? What should your sample size be? What are the pitfalls? Your approach can be the determining factor to whether you will ever attain true understanding of process performance or see any significant improvements in quality, uptime, or deliverability at cost.

By: Steve Wise

Selecting the right control chart starts by knowing something about what you want the chart to say about the process—what questions do you want the chart to answer? Another way to look at this is to ask yourself, “Why am I collecting data on this part?” The answers to these questions will provide necessary information to determine the sampling strategy, sample size, and any special needs that would require implementing special processing options that extend the function of traditional charts.

By: Steve Wise

The manager of a local grocery store is having dinner with his statistician friend. The store manager tells his friend about a certain cashier who is stealing from the company.

The manager is frustrated because he thinks he knows who the thief is, but can’t fire the miscreant because the employee has been with the company for years and is well-liked by customers, and neither the manager nor corporate accounting has ever actually caught this employee stealing.

By: Steve Wise

Some folks like to use control charts to analyze gauge study results. When using a control chart in this manner, one can assume that the chart should represent a series of gauge studies conducted over a period of time. In this example, let’s say that each morning a gauge is verified by recording five repeated measurements of a certified gauge block.

By: Steve Wise

In a certain operation, a part is subject to a high-temperature curing cycle. The ideal curing scan is illustrated in the chart below. The oven chamber begins at room temperature, ramps up to a conditioning temperature of about 80 degrees, dwells for four minutes, ramps up again to the curing temperature of 120 degrees, dwells for five minutes and then cools back to room temperature.To monitor the temperature profile, a thermocouple is placed on the part. There are 11 key temperature readings during the cycle marked on the illustration.

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