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  Measurement, Test and Calibration
  Single Sided R&R

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Author Topic:   Single Sided R&R
Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
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posted 09 November 2000 05:41 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
From: "JM Kollmitz"
To:
Subject: Please Help
Date: Wed, 8 Nov 2000 16:16:43 +0200

Dear Sir

We are busy implementing QS9000 in our company and I am the (un)fortunate one who is responsible for MSA in our section, Hot Rolling Mills. My knowledge about R&R is very limited and we have unfortunately got no experts who can answer my questions for me.

The gauges I need to perform R&R on are:
X-ray thickness gauges with a range of 2-30 mm, with a customer spec of ±0,2% of measured thickness.
Cesium Isotope profile gauge with a range of 2-30 mm with a customer spec of 0,2% of measured thickness.
Width gauge with a range of 900-1600 mm with a customer spec of ±1mm of measured width.
Shape gauge with a range of 20-150mm, with a customer spec of 0,2% of measured height.
We manufacture 60 different products, Stainless strips, with dimensions which cover the complete range of all above mentioned gauges.

The operators CANNOT influence the measured results. The reason for this is that our plant is fully automated when in production, and we only use calibrated (certified) standards, for calibration, which we will use for R&R as well. All these standards can only be placed one specific way in the path of measurement. For each gauge we have a Lower, Mid and Upper range standards.

Due to above mentioned we will only do repeatability on the gauges and no reproducibility. Is this correct?

The Questions I have are:
Is there a spreadsheet available which caters only for repeatability analysis, and not repeatability & reproducibility (R&R)?
How would you suggest we do repeatability on these gauge. The wide measuring ranges and many different products seem to be a problem. What I mean is, it will be impossible to get samples (standards) on 60 different products and than do repeatability on all of these.
The whole R&R issue on above gauges has become a nightmare for me. PLEASE HELP!!

Thanks
Regards
Martin

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
Registered:

posted 13 November 2000 02:45 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
> Is there a spreadsheet available which caters only for repeatability analysis,
> and not repeatability & reproducibility (R&R)?

This I don't know. What happens if you only complete the repeatability part of the spreadsheet.

> How would you suggest we do repeatability on these gauge. The wide measuring
> ranges and many different products seem to be a problem. What I mean is, it
> will be impossible to get samples (standards) on 60 different products and
> than do repeatability on all of these.

What about taking 3 places on each type of gage (high, low and middle) and seeing how close the results are at each place?

Do you know the uncertainty of the x-ray?

Just a suggestion -- This is not my forte.

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