Symmetry rule: If an auxiliary view of a part is symmetric about a centerline, a half auxiliary view may be drawn to save space and detailing effort, provided all necessary dimensions are present. Is this correct?

Introduction / Context:
Drafting standards allow the use of symmetry to simplify drawings. When geometry and dimensioning are symmetric, a half view (including half auxiliaries) communicates all required information with clarity and less clutter. We evaluate the rule permitting half auxiliary views.

Given Data / Assumptions:

• Geometry is symmetric about a clear centerline/plane.
• Dimensioning can reference symmetry without ambiguity.
• Notes or symbols indicate that the view is a half view (e.g., centerline, break lines).

Concept / Approach:
Half views reduce repetition. As long as dimensions, tolerances, and notes define the full part unambiguously, a half auxiliary view is equivalent to the full auxiliary for manufacturing and inspection. Standards often show half sections and half views for symmetric parts; the same logic extends to auxiliaries.

Step-by-Step Solution:
1) Confirm symmetry and mark the centerline.2) Construct the auxiliary and present only one half.3) Apply dimensions and indicate that the other half is symmetrical.4) Add notes or symbols if required by company standards.

Verification / Alternative check:
A checker can reconstruct the omitted half by symmetry; if any dimension becomes ambiguous, a full view should be used instead.

Why Other Options Are Wrong:
Limiting to pictorial views: Auxiliaries are orthographic constructs, and half auxiliaries are acceptable with symmetry.“Never allowed”: Contrary to common practice and standards for sections/views.

Common Pitfalls:
Omitting the centerline; forgetting to dimension features that break symmetry (keyways, holes, chamfers).

Final Answer:
Correct