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SPC Charting frequency calculator for X hi/lo chart

Posted 16th May 2018 at 11:51 AM by bobdoering (Bob Doering)
Updated 6th July 2018 at 09:19 AM by bobdoering

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...
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File Type: xlsx x hi-lo charting freq calc.xlsx (9.1 KB, 1152 views)
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"nds" or Number of Discriminate Samples - the Necessary Tool to Work With "ndc"!

Posted 29th March 2018 at 11:28 AM by bobdoering (Bob Doering)
Updated 10th April 2018 at 03:08 PM by bobdoering

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...
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Preparing an X hi/lo-R Chart in Datalyzer

Posted 3rd June 2016 at 03:17 PM by bobdoering (Bob Doering)

Good news! We have verified that the Datalyzer software is capable of doing X hi/lo-R charts for precision machining!
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File Type: docx X hi lo-R charts in Datalyzer.docx (110.9 KB, 415 views)
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Unilateral Tolerance Capability Calculation

Posted 17th May 2016 at 09:07 AM by bobdoering (Bob Doering)
Updated 2nd December 2017 at 08:59 PM by bobdoering

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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File Type: pdf unilateral tolerance capability calculation rev 6 120217.pdf (325.8 KB, 315 views)
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INDEX TO CONTENT ON BOB DOERING'S BLOG!

Posted 26th May 2014 at 11:24 AM by bobdoering (Bob Doering)
Updated 3rd June 2016 at 03:20 PM by bobdoering

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...
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