Line Parallel to one Reference Plane and Perpendicular to other
Line Parallel to VP and Perpendicular to HP
- When the line is parallel to VP and perpendicular to HP, its front view is perpendicular to x-y and shows true length. Its top view is a point view (PV)
- Consider a line CD perpendicular to HP and parallel to VP as shown in Figure
- Its front view c’d’ will be perpendicular to x-y line with true length l.
- Its top view cd will be a point view.
Line Parallel to HP and Perpendicular to VP
- When the line is parallel to HP and perpendicular to VP, its front view is point view and top view is a line of true length perpendicular to x-y.
- Consider a line PQ of length l parallel to HP and perpendicular to VP as shown in Figure 4‑6.
- Top view pq will be perpendicular to x-y with true length l.
- Front view p’q’ will be a point view.
Examples
A line CD of length 50 mm is perpendicular to HP and parallel to VP. Its end C is 10 mm above HP and 15 mm in front of VP. Draw the projections of line CD.
Line CD is perpendicular to HP and parallel VP,
therefore its front view c’d’ will be perpendicular to x-y and
top view cd will be point view 15 mm below x-y.
1)
Take 10 mm distance above x-y and locate c’.
2)
Draw front view c’d’ perpendicular to x-y
of length 50 mm.
3) Draw projection line from c’ and locate point view cd 15
mm below x-y on projection line.
A line PQ of length 50 mm is perpendicular to VP and parallel to HP. End P is 10 mm infront of VP and 30 mm above HP. Draw the projections of line PQ.
