Chapter 3 recap
When drawings and models disagree
The key takeaways from this chapter’s 2 lessons.
Drawings against the model
- Sheets drift from the model through hand edits: overridden dimensions, typed tags and areas, 2D lines, renamed rooms, old revisions.
- Annotation that reads the model (tags, schedules, dimensions) stays right; typed text doesn't.
- The contract says which governs when they disagree; often the issued drawings, sometimes the model.
- Check typed annotation, 2D-only content and the revision on every issued sheet.
Revisions and transmittals
- Each revision gets a code, a date, a description and initials, in the revision table or title block.
- Clouds and revision triangles mark where the sheet changed in this revision.
- A transmittal records which revisions were sent to whom, when and for what purpose.
- Superseded sheets are archived and marked, never left in circulation.