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Unilateral Tolerance Capability Calculation

Posted 17th May 2016 at 09:07 AM by bobdoering (Bob Doering)
Updated 18th May 2016 at 08:06 AM by Marc

Capability indices and calculations are tough enough as it is, but a common approach of using Cpu or Cpl ("half Cpk's") is statistically incorrect. It assumes the data is normal - which is unlikely as you approach the physical limit (0 for...
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The CORRECT steps to implement an SPC chart

Posted 17th November 2010 at 11:46 AM by bobdoering (Bob Doering)
Updated 22nd November 2010 at 05:27 PM by bobdoering

You might have had some SPC training in the past, but it probably skipped over the correct steps to implement charting on the shop floor. Check it out, here they are:

1. Develop the total variance equation (Yes! This is the very first...
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Goodness of Fit: Is it normal? Probably...or probably not - it's all probability

Posted 1st March 2010 at 05:03 PM by bobdoering (Bob Doering)
Updated 26th May 2014 at 11:09 AM by bobdoering

When looking at goodness of fit statistics, what you are determining is the probability of whether the data does not fit the specific distribution. In Charles Annis page on Anderson-Darling, his Note 1 does a good job of explaining what you are really...
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Statistical process control for precision machining - Sample Data

Posted 9th September 2009 at 12:07 PM by bobdoering (Bob Doering)
Updated 17th October 2009 at 07:12 PM by bobdoering

Some folks were looking for some sample data of a precision machining process in control. Attached is such data, from an actual CNC turning of a forged blank. Feel free to ask me any questions in the forum!
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Statistical Process Control for Precision Machining Video Training Course

Posted 28th March 2009 at 10:01 PM by bobdoering (Bob Doering)
Updated 5th May 2012 at 09:47 AM by bobdoering
Some Related Topic Tags control chart, precision machining, spc

Statistical Process Control for Precision Machining - The Movie


You may have read the book, but now you can experience the movie. Check out the steps that will be taken to bring the story of Correct Statistical...
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