Introduction / Context:
Professional mechanical drawings are controlled documents. Untracked edits create confusion on the shop floor, lead to nonconforming parts, and compromise quality systems. This item checks understanding of revision control and traceability.
Given Data / Assumptions:
- Drawings are used for purchasing, fabrication, and inspection.
- Organizations follow documented processes (e.g., ECO/ECN).
- A revision block or PDM system records changes.
Concept / Approach:
Formal change control captures what changed, why it changed, who approved it, and when it becomes effective. Typical artifacts include: revision letter/number, change description, affected notes/dimensions, and signoffs. This ensures everyone builds to the same, latest specification and supports audits and liability protection.
Step-by-Step Solution:
Identify the current released revision in the title block or PLM.Propose changes through an engineering change request (ECR) or notice (ECN).Update the drawing, increment the revision, and document the change in the revision block.Release the update and notify stakeholders to prevent mixed-revision production.
Verification / Alternative check:
Cross-check the drawing’s revision identifier against the traveler or work order; they must match before fabrication proceeds.
Why Other Options Are Wrong:
Correct: Implies uncontrolled changes—contrary to quality standards.Allowed after first article approval / Valid for internal prototype sketches: Even prototypes benefit from traceability; uncontrolled edits still risk errors.
Common Pitfalls:
Editing PDFs or printed copies without updating the master.Failing to communicate obsoleted dimensions and tolerances to suppliers.
Final Answer:
Incorrect
Discussion & Comments