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Thursday, December 27, 2012

Bluehill 3.31 and TrendTracker (Part 2): New Control Chart

In Part 1 of this series, I talked about TrendTracker, our latest software offering to accelerate data analysis workflow. In this part 2 and the next few posts I would like to talk about Bluehill 3 features that are part of 3.31.
Let me start with my favorite feature: the new graph type called Control chart.



Control chart is a line chart of the result of your choice like Peak Load, Extension at Break or Youngs Modulus for each specimen in your sample. To get a better picture of the variation within the sample you can also overlay horizontal lines at the following values:
  • average value
  • upper standard deviation limit(1 to 6 standard deviations above the average value line)
  • lower standard deviation limit(1 to 6 standard deviations below the average value line)
  • upper acceptance value (design specification)
  • lower acceptance value (design specification)

One, two, three...six sigma

The result is a visually comprehensive snapshot of variation within the sample. For example you can tell how tightly the design specification limits are being followed by how many sigma widths you are able to fit within those limits. The following example chart has a high standard deviation where only one sigma width could fit within the acceptance limits
Whereas with a lower standard deviation more sigma widths can fit within the acceptance limits like the following three-sigma process.

Look great on your report

You can have both the graphs in Bluehill 3 plot control charts of particular results in the results table. The operator can see the variation as he is testing and it will also be a great way to report the results to your customers.

4 comments:

  1. I am new to this software. we had merlin.
    The tech never instructed me how to do a 2 direction test. We have a instron 5567 table top unit running bluehill 3 and i need to do a test where i install and measure force of a seal onto a shaft in the down stroke and then repeat on the up stroke for removal. any help with a method would be greatly appreceatied.

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    Replies
    1. The best way to do this is using the TestProfiler. Do you have this module in Bluehill 3. Please contact our tech support who would be able to help.

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  2. What is the best practice for the setting acceptance limits when there is only a one sided (lower) specification? There doesn't seem to be a way to leave one of the acceptance limits blank.
    BlueHill LE 3.62.3579

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    Replies
    1. Hi Nick,

      Good question. Both a lower and upper limit must be set when using acceptance limits. I recommend you set the appropriate lower limit, and an upper limit that far exceeds a realistic value for the result.

      Thanks,
      Elena

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