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| articles:auditing_7.1.5 [2024/06/23 10:07] – [1 - Micrometer Past its Calibration Due Date] rrandall | articles:auditing_7.1.5 [2024/07/09 08:54] (current) – [6 - Using a Precision Micrometer to calibrate Gage Blocks] rrandall |
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| I've seen CMS procedures that state: "//Calibration is due during the month identified on the calibration status label, without regard for the specific day identified.//" or "//Calibration is due within 45 days past the date identified on the calibration status label.//" This certainly satisfies the requirement in ISO 9001/AS9100, sec. 7.1.5.2a relating to specifying an "interval". | I've seen CMS procedures that state: "//Calibration is due during the month identified on the calibration status label, without regard for the specific day identified.//" or "//Calibration is due within 45 days past the date identified on the calibration status label.//" This certainly satisfies the requirement in ISO 9001/AS9100, sec. 7.1.5.2a relating to specifying an "interval". |
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| The auditor should understand and recognize that a measuring instrument does not //magically// go "Out of Tolerance" on a certain date. The calibration interval (cycle) is merely a "risk control" to mitigate: | The auditor should understand and recognize that a measuring instrument does not //magically// go "Out of Tolerance" on a certain date. The calibration interval (cycle) is merely a "risk control" to mitigate: |
| - the likelihood of an instrument drifting out of tolerance during the calibration period, and | - the likelihood of an instrument drifting out of tolerance during the calibration period, and |
| - the impact/significance that an "Out-of-Tolerance" condition could have resulted in the shipment of nonconforming product(s) due to errors in measurements. | - the impact/significance that an "Out-of-Tolerance" condition could have resulted in the shipment of nonconforming product(s) due to errors in measurements. |
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| There are many factors that can contribute toward an instrument drifting out of tolerance, which include, but are not limited to: | There are many factors that can contribute toward an instrument drifting out of tolerance, which include, but are not limited to: |
| * Wear (due to frequent use—which is most common for dimensional measurement devices) | * Wear (due to frequent use—which is most common for dimensional measurement devices) |
| ===== 6 - Using a Precision Micrometer to calibrate Gage Blocks ===== | ===== 6 - Using a Precision Micrometer to calibrate Gage Blocks ===== |
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| __Situation__ Similar to the above scenario, but at a different company, you discover that the company is using a [[https://www.starrett.com/metrology/product-detail/W733.1XFL-1#Specifications|Starrett W733.1XFL-1 Wireless Electronic Micrometer]] to calibrate their class AS-2 Gage Block set (stainless steel, rectangular 0.010" to 2"). While the Starrett W733.1XFL-1 Micrometer Calibration certificate contains minimal information, you notice that it has a digital display with a resolution of 0.00005" (50 μin.). To verify that the Test Accuracy Ratio (T.A.R.) is sufficient, you see that the Gage Blocks Calibration Certificate indicates an accuracy of ±10 μin. (±0.00001"). | __Situation__ Similar to the above scenario, but at a different company, you discover that the company is using a [[https://www.starrett.com/details?cat-no=W733.1XFL-1|Starrett W733.1XFL-1 Wireless Electronic Micrometer]] & [[https://www.starrett.com/details?cat-no=W733.1XFLZ-2|Starrett W733.1XFLZ-2 Wireless Electronic Micrometer]] a to calibrate their class AS-2 Gage Block set (stainless steel, rectangular 0.010" to 2"). While the Starrett W733.1XFL-1 Micrometer Calibration certificate contains minimal information, you notice that it has a digital display with a resolution of 0.00005" (50 μin.). To verify that the Test Accuracy Ratio (T.A.R.) is sufficient, you see that the Gage Blocks Calibration Certificate indicates an accuracy of ±10 μin. (±0.00001"). |
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