Dimensional Measuring Interface
Standard
Standard Improvement Request
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SIR No. 97-73 DMIS Release 3.0 SIR Type Other Severity Documentation Deficiency Status Resolved Date Submitted August 18 1997 Date Validated August 18 1997 Date In Process Date Referred Date Vote Pending Date Closed October 9 1998 Action Clarifications Submitted By Thomas Kramer NIST Room B-124, Bldg. 220 Gaithersburg MD 20899 USA Phone: (301)975-3518 Fax: (301)990-9866 kramer@cme.nist.gov |
Problem Topic
DATSET: Spec. incomplete CS
Problem Description
Note: This is the fourth of four SIRs relating to DATSET on pages 17 to 19
(section 3.5). Last week I sent in four SIRs concerning DATSET on pages
113 and 114.
This section allows using DATSET to define an incompletely specified coordinate system. This does not seem to be a good idea, because it is not possible to tell where things are located in an incompletely specified coordinate system. For example, the DMIS code at the bottom of the first column on page 18 establishes a coordinate system with only a known Z-axis direction and Z-origin. How is one to determine where a feature is in the X-direction when the X-direction is unspecified? There is no way to determine where to measure the circle defined at the top of the second column on page 18.
References
None
Related SIRs
None
Suggested Resolution
My preferred resolution is to rethink and rewrite DATSET.
To fix only this specific problem, rewrite the DMIS code shown in section 3.5.6 so that no definitions occur and no measurements are taken when an incompletely specified coordinate system is in effect.
Support Documentation
None
Resolution
Warning!!
The following statement is only a resolution to a Standard Improvement Request (SIR) and is NOT part of the current DMIS standard, nor is it guaranteed to become part of the next revision of the DMIS standard even if voted and accepted by the DMIS National Standards Committee. This resolution is tentative because it may not be incorporated into the next version of the standard, it could be changed prior to the next release, or it could be changed as the result of the "public review and comment" period required for the next version of the standard. If you choose to use this tentative resolution, you do so at your own risk since at this time it is not part of the DMIS standard.
No change to standard.
Attachments
None
Notes
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