Introduction / Context:
Orthographic projection uses three principal planes: frontal, horizontal, and profile. Understanding which view is cast onto which plane is fundamental for setting up view orientations and interpreting engineering prints. The question asks whether the profile plane is specifically the plane for side views.
Given Data / Assumptions:
- Principal planes are mutually perpendicular.
- Front view projects to the frontal plane, top view to the horizontal plane, side view to the profile plane.
- First-angle and third-angle conventions rearrange view placement but not plane definitions.
Concept / Approach:
The profile plane is perpendicular to both the frontal and horizontal planes. When looking from the right (or left), the object is projected onto this plane to produce the right-side (or left-side) orthographic view. The definition is therefore correct and independent of the angle-of-projection convention used on the sheet.
Step-by-Step Solution:
Establish three planes: frontal (front), horizontal (top), profile (side).Project side-view rays perpendicular to the profile plane.Lay out the side view in compliance with first- or third-angle mapping on the sheet.Label the view and denote hidden and center lines as appropriate.
Verification / Alternative check:
Many textbooks show glass-box unfolding: the side face is the profile plane that becomes the side view on the sheet.
Why Other Options Are Wrong:
Incorrect: Conflicts with the standard definition.True only in third-angle / first-angle: Plane identity does not change, only placement on the sheet changes.
Common Pitfalls:
Confusing view placement convention with the underlying projection plane definition.Mislabeling side views when unfolding the “glass box.”
Final Answer:
Correct
Discussion & Comments