Development of the Surface of a Truncated Cylinder:

Procedure

(a)  Sketch the front and top views of a truncated cylinder.

(b)  Divide the base circle into an equal number of parts and project the generator on the front view.

(c)  Mark the points of intersection as a₁, b₁, c₁, etc, with the generators and the truncated zone of cylinder.

(d)  Sketch the stretch-out line equivalent to the circumference of the base of cylinder.

(e) Divide here stretch-out line into the same number of equal parts as that of the base and draw the generators through them.

(f) Situate the points A₁, B₁, and C₁ with a smooth curve.

Notice: The generators must not be drawn thick, as they do not represent the edges on the surface.