Choosing the right section to avoid dimensioning to hidden features To prevent dimensioning to hidden edges or holes, which type of section view should a drafter use to expose just a local interior area without cutting the entire part?

Introduction / Context:
Dimensions should, whenever possible, be applied to visible lines rather than hidden lines. When only a small, local feature is hidden (for example, a spot face or a blind cavity), completely sectioning the part is excessive. Drafting standards therefore include a partial section technique that exposes only the area of interest.

Given Data / Assumptions:

• A local internal feature must be dimensioned.
• Global sectioning would clutter the drawing or obscure other details.
• Standard 2D drawing conventions (ASME/ISO) apply.

Concept / Approach:
A broken-out section removes a small, irregular portion of the view using a freehand break line, revealing internal geometry where needed while leaving the rest of the view untouched. This lets the drafter dimension to visible edges rather than hidden lines, improving clarity and reducing interpretation errors.

Step-by-Step Solution:
Identify the hidden feature requiring dimensions.Sketch a jagged or spline freehand break line around the area.Indicate the depth of the break if required (e.g., to a centerline or surface).Hatch only the exposed material within the broken-out region.

Verification / Alternative check:
Compared with whole or half sections, a broken-out section minimizes redrawing effort, preserves external contours, and reduces the number of auxiliary views. Standards explicitly recommend avoiding dimensioning to hidden lines, making broken-out sections the preferred solution for local features.

Why Other Options Are Wrong:

• Whole: cuts entirely through, unnecessary complexity for a local feature.
• Half: best for symmetric objects, not a small local reveal.
• All of the above: only the broken-out section meets the local-exposure requirement.

Common Pitfalls:
Over-extending the break, forgetting to hatch exposed material, or failing to show a clear depth reference.

Final Answer:
broken out