Hidden lines

Definition

Hidden lines are dashed lines used in engineering drawings to represent edges or outlines that are not visible from a particular view. They help convey the shape and internal features of an object when parts are obscured, allowing viewers to understand the complete geometry of the design. Hidden lines are essential for accurately depicting complex parts and ensuring that all necessary details are communicated.

5 Must Know Facts For Your Next Test

1. Hidden lines are typically represented with short dashes, which distinguishes them from visible lines that are solid.
2. In engineering drawings, hidden lines provide critical information about features such as holes, grooves, or cutouts that aren't seen in the primary view.
3. Understanding hidden lines is crucial for interpreting multi-view drawings, especially when parts overlap or obscure one another.
4. Hidden lines should only be used when necessary; overuse can clutter drawings and make them difficult to read.
5. Different standards may dictate how hidden lines are drawn, so familiarity with specific drawing conventions is important for clear communication.

Review Questions

• How do hidden lines enhance the understanding of complex geometries in engineering drawings?
  • Hidden lines improve understanding by providing a visual representation of features that aren't visible from the current viewpoint. They indicate important internal characteristics of an object, allowing engineers and designers to comprehend how parts fit together and function. This is particularly useful when multiple components overlap or when internal features need to be shown without creating a misleading or incomplete representation.
• Discuss the significance of using different line types, such as hidden lines and visible lines, in the context of creating clear engineering drawings.
  • Using various line types like hidden lines and visible lines is crucial for clarity and effective communication in engineering drawings. Visible lines indicate what can be seen directly, while hidden lines reveal essential features that would otherwise remain obscured. This distinction helps viewers understand the complete design without confusion, ensuring all critical details are presented accurately and comprehensively.
• Evaluate the impact of improperly using hidden lines on the interpretation of an engineering drawing and possible consequences in a project.
  • Improper use of hidden lines can lead to misinterpretation of an engineering drawing, potentially causing confusion about an object's true geometry. If hidden lines are overused or incorrectly applied, it may obscure important details rather than clarify them. Such errors can result in flawed designs, production mistakes, increased costs, and delays in project timelines. Therefore, following standard practices for line usage is essential for ensuring accurate communication among engineers and stakeholders.

Related terms

visible lines: Solid lines used in engineering drawings to represent edges that are visible in the current view.

center lines:

Dashed lines that indicate the center of circles or symmetrical objects, used for reference in designs.

section lines: Lines used to indicate where an object has been cut through in a section view, showing internal features.