The ASME B89.7 series focuses on measurement uncertainty, the way to define the chances that your measurement is “off.” You might put it another way and say that it is the statement of how “inexact” a measurement might be. One of the keystone standards of the series is ASME B89.7.2, “Dimensional Measurement Planning.” This document has been developed to specify a standard method for assessing the dimensional acceptability of manufactured parts or products. The new 2014 Edition of this document has just been released and is available from Document Center Inc. now.
Firstly, the standard uses GUM (the Guide to the expression of Uncertainty in Measurement) for the uncertainty factor. This method for expression should provide a business case for usage, including the cost of measurements, consequences of pass and fail errors, liability, specific policies, and customer requirements. So both the buyer and the seller must sign off on how exact (or inexact) a produced part must be in terms of dimensions in order to meet the contractual requirements. (You might be thinking about the ASME Y14.5 right now, “Dimensioning and Tolerancing”).
In order to achieve this, planning is required for the definition and production phases. This is the standard for setting up and executing your protocols. It tells you what requirements you’ll need to meet for for preparation and approval of dimensional measurement plans and how to then use those plans for your actual processes.
Who should use this standard? Process and quality control engineers (dimensional measurement planners) will find it invaluable in planning manufacturing-related dimensional measurements.
What other standards are part of this series? Here’s a list:
- ASME B89.7.3.1, Guidelines for Decision Rules: Considering Measurement Uncertainty Determining Conformance to Specifications
- ASME B89.7.3.2, Guidelines for the Evaluation of Dimensional Measurement Uncertainty (Technical Report)
- ASME B89.7.3.3, Guidelines for Assessing the Reliability of Dimensional Measurement Uncertainty Statements
- ASME B89.7.4.1, Measurement Uncertainty and Conformance Testing: Risk Analysis (An ASME Technical Report)
- ASME B89.7.5, Metrological Traceability of Dimensional Measurements to the SI Unit of Length (An ASME Technical Report)
Why purchase this new edition? The 2014 Edition of ASME B89.7.2 replaces the now obsolete 1999 Edition. As you can see, it’s been a while since the document was updated, so you’ll want to get your copy of the latest edition now.
How can you order your copy? Head to Document Center Inc.’s webstore at www.document-center.com. You can order online or contact our staff for more information. They’re available by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com). We’re here to support your use of standards, both by supplying documents and by providing you with additional services for maintaining your collection. Make us your Standards Experts!
