Hidden lines in isometric drawings: For clarity in pictorial representation, are hidden lines usually omitted from isometric drawings unless they are needed to explain an internal feature?

Introduction / Context:
Isometric drawings are pictorial views used to visualize a part or assembly. Because they are intended for quick comprehension, excessive hidden lines can clutter the view and defeat the purpose. Thus, drafters often omit hidden lines unless they are essential to communicating internal features.

Given Data / Assumptions:

• The isometric view is being used for visualization and general communication.
• Internal features may be better shown with sections or cutaways.
• Clarity and readability take precedence over exhaustive line inclusion.

Concept / Approach:
Omitting hidden lines simplifies the graphic and guides the reader’s eye to key external forms. When internal geometry matters, a sectioned isometric or an auxiliary orthographic section is preferable. Selective inclusion of a few hidden lines is acceptable if they are critical to understanding; otherwise, they are left out for clarity.

Step-by-Step Solution:

Verification / Alternative check:
Compare two isometrics of a part with many internal cavities: the version without hidden lines is cleaner. A separate sectional isometric or orthographic section conveys internals without overwhelming the main view.

Why Other Options Are Wrong:

Common Pitfalls:
Showing too many hidden edges in isometric; forgetting to provide a complementary section view when internals are functionally important.

Final Answer:
Correct