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bobdoering is appreciated, and has over 1700 Karma points.bobdoering is appreciated, and has over 1700 Karma points.bobdoering is appreciated, and has over 1700 Karma points.
bobdoering is appreciated, and has over 1700 Karma points.bobdoering is appreciated, and has over 1700 Karma points.bobdoering is appreciated, and has over 1700 Karma points.bobdoering is appreciated, and has over 1700 Karma points.bobdoering is appreciated, and has over 1700 Karma points.bobdoering is appreciated, and has over 1700 Karma points.bobdoering is appreciated, and has over 1700 Karma points.

bobdoering bobdoering is offline

Stop X-bar/R Madness!!

About Me

  • About bobdoering
    Real Name
    Bob Doering
    Location
    LaGrange, OH
    Specialty / Field(s) of Expertise
    Statistical Process Control for Precision Machining, metrology, automotive quality systems
    Public Email Address
    info@correctspc.com
    Company or School Name
    CorrectSPC: When Normal Is Not Typical
    Company Product(s), Processes and/or Services
    Precision machining SPC confusing not giving you valuable feedback? The problem is the distribution is not normal, but people are applying normal statistics and control charts to it and yielding wrong information. CorrectSPC is a technique that busts the myth of the normal curve in precision machining. It presents a technique that provides more information that is meaningful to the operator and the quality professional. No transformations, no defects, no extra cost! See movie on website for
    LinkedIn Page
    http://www.linkedin.com/pub/bob-doering/24/886/971
  • Signature
    If we didn't care, we wouldn't share. That's why we're there.

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General Information
  • Registration Date: 2nd May 2002
  • Referrals: 1

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Blog

Latest Blog Entry

Posted 16th May 2018 at 11:51 AM by bobdoering Comments 0
Posted in Uncategorized
One of the things that is unclear with Shewart charts is the frequency of charting. However, with the X hi/lo chart for precision machining, the frequency can actually be calculated. Attached is the Excel calculator for determining frequency. The...

Posted 29th March 2018 at 11:28 AM by bobdoering Comments 0
By now, you should be aware of the concept of “ndc” or number of discriminate categories that a measurement gage is capable of discerning. It is a statistically significant discrimination, or the capability of telling the difference between items even...

Posted 3rd June 2016 at 03:17 PM by bobdoering Comments 0
Good news! We have verified that the Datalyzer software is capable of doing X hi/lo-R charts for precision machining!

Posted 17th May 2016 at 09:07 AM by bobdoering Comments 0
Posted in Uncategorized
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...

Posted 26th May 2014 at 11:24 AM by bobdoering Comments 1
Here is a handy index for the information in my blog! (Be sure to click Continue reading... below to see the whole page!)

SPC GENERAL

The CORRECT steps to implement an SPC chart


SPC FOR PRECISION MACHINING...
Recent Comments
Nice list. Thank you!...
Posted 2nd June 2014 at 05:15 PM by Marc Marc is offline
Quote:
In Reply to Parent Post by mclayton

2012 REVISIT and this
...
Posted 17th September 2012 at 09:16 PM by bobdoering bobdoering is offline
2012 REVISIT and this...
Posted 13th July 2012 at 01:18 AM by mclayton mclayton is offline
Quote:
In Reply to Parent Post by carleycar

How can I define whether
...
Posted 13th June 2012 at 01:16 AM by bobdoering bobdoering is offline
How can I define whether...
Posted 12th June 2012 at 11:58 AM by carleycar carleycar is offline

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