Dimensional Measuring Interface
Standard
Standard Improvement Request
|
SIR No. 97-72 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 August 20 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: Primary plane clarification
Problem Description
Note: This is the third 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.
Page 17, section 3.5.4 The third sentence of the section reads: "Once determined, this axis and the plane normal to it become the primary axis and primary plane establishing the ORIENTATION of the part coordinate system."
It is sensible to establish a part coordinate system by starting with a primary axis, but there is no need for a primary plane. There are an infinite number of planes normal to an axis, not just one. The axis direction may have been established without the use of a plane; in this case, which plane would be chosen as the primary plane?
References
None
Related SIRs
None
Suggested Resolution
My preferred resolution is to rethink and rewrite DATSET.
To fix only this specific problem, change to quote to read: "Once determined, this axis becomes the primary axis establishing the ORIENTATION of the part coordinate system."
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.
Modify text in section 3.5.4.
Change the third sentence of section 3.5.4 on page 17 to read:
"Once determined, this axis becomes the primary axis establishing the ORIENTATION of the part coordinate system."
Attachments
None
Notes
Added by Mike Holloway, hkm@ornl.gov on 7/31/1998
The current wording needs to be corrected. The suggested resolution sounds good to me.
Added by Interpretation Subcommittee, hkm@ornl.gov on 8/7/1998
Change the third sentence of section 3.5.4 on page 17 to read:
"Once determined, this axis becomes the primary axis establishing the ORIENTATION of the part coordinate system."