Plane Surfaces in Engineering Drawings
08 MARKS
Draw the position of line, planes, solids with reference
plane
Plane surface (plane/lamina/plate)
A plane is as two dimensional surface having length and breadth
with negligible thickness. They are formed when any three non-
collinear points are joined. Planes are bounded by straight/curved
lines and may be either regular or an irregular. Regular plane
surface are in which all the sides are equal. Irregular plane
surface are in which the lengths of the sides are unequal.
Positioning of a Plane surface
A plane surface may be positioned in space with reference to the
three principal planes of projection in any of the following
positions:
•
Parallel to one of the principal planes and perpendicular to the
other two.
•
Perpendicular to one of the principal planes and inclined to the
other two.
Inclined to all the three principal planes.
Projections of a Plane surface
A: Plane surface parallel to one plane and perpendicular to the
other two
Figure 1. Projections of a triangular lamina on the
projection planes
Figure 2. Rotation of PP and HP after
projection
Figure 3. Orthographic projections of the lamina ABC
B) Plane parallel to HP and perpendicular to both VP and
PP
Figure 4. Projections of the lamina with its surface parallel
to HO and perpendicular to both VP and PP
Plane parallel to PP and perpendicular to both HP and VP
Figure 5 Projections of a pentagonal lamina with its surface parallel to PP
and perpendicular to HP and VP
D) Plane surface perpendicular to one plane and inclined to the other two
Figure 6. The projections of the triangular lamina
Exploring the concept of plane surfaces in technical drawings, this informative content covers the definition, characteristics, and positioning of planes in space relative to projection planes. It also delves into the projections of various plane surfaces parallel, perpendicular, and inclined to principal planes, providing a comprehensive understanding for engineering and architectural students and professionals alike.
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Presentation Transcript
Draw the position of line, planes, solids with reference plane
Plane surface (plane/lamina/plate) A plane is as two dimensional surface having length and breadth with negligible thickness. They are formed when any three non- collinear points are joined. Planes are bounded by straight/curved lines and may be either regular or an irregular. Regular plane surface are in which all the sides are equal. Irregular plane surface are in which the lengths of the sides are unequal. Positioning of a Plane surface A plane surface may be positioned in space with reference to the three principal planes of projection in any of the following positions: Parallel to one of the principal planes and perpendicular to the other two. Perpendicular to one of the principal planes and inclined to the other two. Inclined to all the three principal planes.
Projections of a Plane surface A: Plane surface parallel to one plane and perpendicular to the other two Figure 1. Projections of a triangular lamina on the projection planes
Figure 2. Rotation of PP and HP after projection
B) Plane parallel to HP and perpendicular to both VP and PP Figure 4. Projections of the lamina with its surface parallel to HO and perpendicular to both VP and PP
Plane parallel to PP and perpendicular to both HP and VP Figure 5 Projections of a pentagonal lamina with its surface parallel to PP and perpendicular to HP and VP
D) Plane surface perpendicular to one plane and inclined to the other two Figure 6. The projections of the triangular lamina
