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  Measurement, Test and Calibration
  ? R&R study for hardness m/c

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Author Topic:   ? R&R study for hardness m/c
Geoff Cotton
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Posts: 34
From:Staffordshire, England
Registered: Jun 2000

posted 13 September 2000 08:23 AM     Click Here to See the Profile for Geoff Cotton   Click Here to Email Geoff Cotton     Edit/Delete Message   Reply w/Quote
Hi folks,

Can anyone help with a method to conduct a R&R study on a Vickers hardness testing m/c?

(We manufacture small rivets)

Thanks in advance.

Geoff


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David Drue Stauffer
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Posts: 25
From:St. Louis, MO63132United States
Registered: Feb 2000

posted 29 September 2000 03:20 PM     Click Here to See the Profile for David Drue Stauffer   Click Here to Email David Drue Stauffer     Edit/Delete Message   Reply w/Quote
The first rule for performing an R&R study is that the test be repeatable. Any device that is essentially a destruct test such as force gages and hardness testers cannot repeat. Therefore they fall beyond the scope of the R&R study.
Reliability may however, be obtained by applying statistical techniques to show capability of the gage itself. Repeated test that track the results with : Xbar & R charts, and a histogram to show the dispersal of the readings and figuring the Cp, Cpk will provide confidence in the readings. Unforunately, trying to determine how much of the variability in the process is attributable to the device itself is virtually impossible. Comparisons to the calibration standards shown in a graphical format is about the best you will be able to achieve. Luck to ya.

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Dawn
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Posts: 245
From:St. Marys, PA
Registered: Sep 98

posted 30 October 2000 10:36 PM     Click Here to See the Profile for Dawn   Click Here to Email Dawn     Edit/Delete Message   Reply w/Quote
We have a Ford auditor who is demanding gage R & R's on hardness testers. Is there someone out there who has performed one and can help me?

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Roger Eastin
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Posts: 345
From:Greenville, SC
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posted 31 October 2000 08:15 AM     Click Here to See the Profile for Roger Eastin   Click Here to Email Roger Eastin     Edit/Delete Message   Reply w/Quote
This question has been asked before, but it has been awhile. You may want to do a search in the old forum. Also, EOMs for destructive testing are not unusual. You have to make some assumptions, but it can be done. Some of the texts mentioned in the Bibliography of the MSA manual contain information on destructive testing - one by Donald Wheeler, for instance. In fact, Wheeler's text book (reference 27) should have something in it.

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