# PROJECTIONS OF SOLIDS CLASS NOTES FOR ENGINEERING

## CLASS NOTES FOR ENGINEERING

### TYPES OF SOLIDS

Fig. Cube, Triangular Tetrahedron and a Hexagonal prism

1. #### Solids of revolution

Fig. Solids of revolution, Cylinder, sphere and a cone

### PROJECTIONS OF SOLIDS

#### (a) Axis is perpendicular to HP or VP

Fig. Solids with axis Perpendicular to HP and parallel to VP

1. #### Draw the projection of the solid with axis perpendicular to HP. It gives the true shape and size of the base in HP (TOP VIEW). Projections completed only in one step.

Procedure for a cylinder

First draw the top view on the HP which is a circle in case of a cylinder. Project the front view by taking height of the cylinder.

#### (b). Axis parallel to HP & VP.

Fig. Projections of a triangular prism with base lying in HP and axis parallel to both HP & VP

#### (ii)Axis inclined to VP and parallel to HP

These projections are obtained by two methods.

First Method: By altering the positions of solids

#### (b) Similarly draw the projections for a solid axis inclined to VP.

Second Method: By altering the ground line x y

(i) Draw the top view and front view in simple position with axis perpendicular to HP.

(ii) Draw a line x1y1 as new ground line inclined to the axis at an angle θ. Draw projections perpendicular to new ground line x1y1 from front view. Cut the distances of all the points (in the auxiliary top view) below the ground line x y equal to corresponding distances below line x y.

(iii) Draw another line x2y2 inclined at angle φ with x1y1. Project the final front view by keeping the distances of all points from x2y2 equal to their respective distances  the in the auxiliary to top view  above x1y1 line.

1. #### Axis inclined to both HP AND VP

##### Fig. A right circular axis inclined at 450 HP and 300 VP

(a) By altering the position of solids

#### These are final Front and Top views of a solid with axis inclined to both HP and VP.

https://www.mesubjects.net/wp-admin/post.php?post=13375&action=edit       MCQ SECTION OF SOLIDS

https://www.mesubjects.net/wp-admin/post.php?post=13369&action=edit        MCQ Projections of solids