Projection of line in engineering drawing | Engineering Drawing
projection of line in engineering drawing
Projections of Line:
Case 1: Line parallel to both HP and VP:
When a line is parallel to one of the reference planes, its projection on the reference plane to which it is parallel is a line of True Length. So in this case front view and top view of line will be a straight line of true length.
Case 2: Line inclined to HP and parallel to VP:
When a line is inclined to one of the reference planes, its projection on the reference plane to which it is inclined is a line of Reduced Length or Apparent Length. So in this case top view of line will be a straight line of reduced length or apparent length. But front view will be a straight line of true length as line is parallel to VP.
Case 3: Line inclined to VP and parallel to HP:
As line is inclined to VP so, front view will be a straight line of reduced length or apparent length. But top view of line will be a straight line of true length as line is parallel to HP.
Case 4: Line perpendicular to HP and parallel to VP:
When a line is perpendicular to one of the reference planes, its projection on the reference plane to which it is perpendicular is a POINT. So in this case, the top of line will be a point. But front view of line will be a straight line of true length as line is parallel to VP.
Case 5: Line perpendicular to VP and parallel to HP:
As line is perpendicular to VP, so, front view will be a point. But top view will be a straight line of true length as line is parallel to HP.
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