ASME B89.7.1 pdf free download

ASME B89.7.1-2016 pdf free download.Dimensional Measurement Planning.
4 DIMENSIONAL MEASUREMENT PLANNING
4.1 General
For each workpiece to be measured, a dimensional measurement plan shall determine and define necessary measurement tasks and shall specify their requirements.
(a) Necessary measurement tasks can be process control measurements, accept-relect measurements, or both.
(b) Each process control measurement should relate to a controllable parameter of the workpiece manufachiring process.
4.2 PrerequIsites
4.2.1 Dimensional Measurement Planner. The
Dimensional Measurement Planner (DMP) should have the requisite knowledge for adequate consideration of all applicable aspects of the dimensional measurement plan (e.g., dimensioning and tolerancing specifications, statistics, sampling plans, manufacturing plans, measurement uncertainty evaluation, etc.).
4.2.2 Drawings and Specifications. The DM1’ shall review workpiece drawings and specifications to ensure dimensional requirements are clear, fully defined, and understood. The measurands chosen to establish a workpiece’s conformance to the dimensional requirements rely on the clarity and completeness of this information. Where these conditions are not met, the DM1’ shall contact those responsible for the drawings and specifications and obtain documented clarification, in accordance with specified standards and revision levels,
Participation in design reviews with designers can help the DMP to gain an understanding of the true design intent. Such insight into design intent aids the DMP who is responsible for ensuring that the spec ifled requirements are not only valid hut also represent the true design intent. This emphasis is given to ensure that drawing specifications are not overconstrained in such a way as to allow workpieces to be unnecessarily rejected when they will meet all functional requirements. Workpiece drawings and specifications define the measurands to be measured.
4.2.3 Process Characteristics. Where applicable, the OMP shall review the manufacturing plan and manufacturing process failure mode and effects analysis to determine process tendencies and requirements for prediction of potential process failure. The DMP shall work with the manufacturing engineer to determine process control measurement requirements.
4.2.4 DimensIonal Measurement PLanning Constraints. The l)Ml’ shall review acceptable probabilities of pass errors and fail errors, and estimated Costs of inspection and cquipmenL
4.2.5 Existing Equipment. The l)Ml’ shall review the inventory of available gages and equipment and determine adequacy for ensuring that measurement requirements are fully met.
4.3 Dimensional Measurement Plan
The dimensional measurement plan shall contain or reference all information needed for making measurements. Where applicable, the following considerations shall be addressed in developing the dimensional measurement plan (see Nonmandator’ Appendix A for an example):
(a) workpiece identification (e.g., workpiccc number, revision level, serial number, description)
(b) determination of measurands (features to be measured from workpiecc drawing, process sheet, inspection instructions, etc.)
(C) determination of measurements to be taken (e.g., for process control, workpicce acceptance. etc.)
(d) determination of lot sampling plan and sample analysis methods (sample size, frequency)
(e) determination of how measurements will be taken (e.g., on-line or off-line, indicating instruments or gages, automatic or manual)
Q determination of measurement strategy (e.g.. number and location of measured points, sequence of operations, etc.)
(g) determination of report documentation and archival requirements (e.g.. paper report, electronic data files, duration of record maintenance, etc.) and retention of raw measurement data
(h) determination of documentation requirements for metrological traceability of dimensional measurements per ASME 1189.7.5 (e.g., ISO/IEC 17025 calibration reports, documented company quality assurance polic etc.)
(i) determination of data evaluation requirements (e.g., mathematical model, association criteria, algorithms, filters, cutoffs, filter parameters, graphical outputs, etc.)
‘j selection of candidate gage for each measurement (e.g., coordinate-measuring machine, special fixturing. handheld gages, analytical equipment, etc.)
NOTE: &e Nonmandatory Appendix H for mont information.
(k) determination of required measurement skill and time availability
(1) determination of location(s) in plant where measurement(s) will be taken (e.g., workstation, inspechon bench, laborator) etc.) and gage or workpiece portability, ergonomics, workstation-related factors and environmental effects.ASME B89.7.1 pdf download.