PATTERN DESIGN

Truncated Cones

Using a cone as a base for building slab forms makes some forms more easily attained. Bowls, vases, and other vessels can be formed first into conical forms. The clay can then be stretched to create curved surfaces if desired.
Cone patterns are commercially available, but you can make your own using this quick method. All you need is some large paper, a compass of some sort, and an idea.
Rolls of brown kraft paper are easily purchased, and the size and durability of this paper make it a good choice for drawing out patterns. Successful patterns can later be traced onto a more durable material for repeated use.

Begin by drawing a side view of the vessel you want to make. Project lines from the sides of the shape until they meet at a point. This establishes the radius for your cone pattern. Here, you see the profile of a small serving dish, oriented upside down.

Draw an arc along the radius you established for the top (which appears to be the bottom here) of your vessel.

A string, a needle tool, and a pencil make a great compass to draw the radii.

Draw the second arc across the second edge (the bottom) of your vessel.

Set your compass to the width/diameter of your vessel.

Draw an arc using this diameter to extend the circumference of your cone pattern.

Draw a similar arc on the opposite side.

Draw a line from the center point of the radius to the arc along the circumference line.

Repeat this procedure on the opposite side. Add a little extra to the circumference to accommodate the thickness of a clay slab.

The completed drawing.

Cut out completed pattern.