Projections of solids placed in different positions

The solids may be placed on HP in various positions

1. The way the axis of the solid is held with respect to HP or VP or both -
• Perpendicular to HP or VP
• Parallel to either HP or VP and inclined to the other
• Inclined to both HP and VP
2. The portion of the solid on which it lies on HP, except when it is freely suspended position.  It can lie on HP on its base edge or a corner, or a lateral face, or apex.

Axis of the solid perpendicular to HP

A solid when placed on HP with its axis perpendicular to it, then it will have its base on HP.  This is the simplest position in which a solid can be placed. When the solid is placed with the base on HP position, in the top view, the base will be projected in its true shape. Hence, when the base of the solid is on HP, the top view is drawn first and then the front view and the side views are projected from it. Figure 10 shows a cylinder with its axis perpendicular to HP. There is only one position in which a  cylinder or a cone may be placed with its base on HP.

 

Figure 10. Front view and top view of a cylinder and cone