Dimensional Measuring Interface
Standard
Standard Improvement Request
|
SIR No. 97-71 DMIS Release 3.0 SIR Type Other Severity Other 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 axis clarification
Problem Description
Note: This is the second 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 This section begins: "The first step in creating a part coordinate system is to establish the direction of the primary axis based on the primary datum reference of the part. This must be determined with a minimum of three points."
The direction of the primary axis of a system does not have to be established using a plane. It might be established, for example, as the direction of a line between two corners of a part, or, for another example, between the centers of two circles on a part (the TEAM part DMIS program does it this way).
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: "The first step in creating a part coordinate system is to establish the direction of the primary axis. This direction might be, for example, the normal to a datum plane."
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.
Modified text in section 3.5.4.
Change the first two sentences of section 3.5.4 on page 17 to read:
"The first step in creating a part coordinate system is to establish the direction of the primary axis. This direction might be, for example, the normal to a datum plane."
Attachments
None
Notes
Added by Mike Holloway, hkm@ornl.gov on 7/31/1998
Yes, this needs to be changed. The wording in the suggestion sounds ok to me.
Added by Interpretation Subcommittee, hkm@ornl.gov on 8/7/1998
Change the first two sentences of section 3.5.4 on page 17 to read:
"The first step in creating a part coordinate system is to establish the direction of the primary axis. This direction might be, for example, the normal to a datum plane."