Engineering Graphics - Sections of Solids


Sections of Solids


Perpendicular to the VP and Parallel to the HP:


1. Ok..!
Let us imagine that a pentagonal pyramid of base 25mm and height 55mm rests with its base on the HP such that one of its edges is perpendicular to the VP. A section plane parallel to the HP and perpendicular to the VP cuts the pyramid at 20mm from the apex.
1.   Draw the line XY.

2.   Draw the top view as a pentagon and name its corners.

3.   Draw projectors from each corner of the top view through XY.

4.   Draw the front view as shown in the figure and name its corners.

5.   Draw the section plane in the front view at 20mm from the apex and name the sectional points.
6.   Draw projectors from each sectional point in front view so that they cut the corresponding edges in the top view.
7.   Name these points and join them.

8.   Draw the hatching lines to get the sectional top view.

2. Ok ..! Let us imagine that a regular pentagonal prism of base edge 25mm and height 60mm rests on the HP on one of the edges of its base and with its axis inclined at 30  to the HP. A
section plane parallel to the HP and perpendicular to the VP cuts the prism at the highest corner

of the prism's base.

1.   Draw the line XY.

2.   Draw the projections of the prism placed in the simple position (the axis is perpendicular to the HP and parallel to the VP).
3.   Rotate the front view so that the axis is inclined at 30° to XY.

4.   Draw projectors from the front view through XY and from the initial top view.

5.   Draw the rotated top view as shown in the figure and name its corners.

6.   Draw the section plane in the rotated front view through the top corner of the base and name the sectional points.
7.   Draw projectors from each sectional point of the front view through XY to cut the corresponding edges of the top view.
8.   Name the points and join them, as shown.

9.   Draw the hatching lines to get the sectional top view.


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