In Parallel Line Pattern Development, we required parallel element line or bends. Some objects are of a conical shape and parallel line will not work on them. Rather, we will look at using Radial Line Pattern Development.

In radial line, we develop patterns for shapes that have a taper, all element lines (bends) must radiate back to a common point, a radius point. We need two things for this process to work:

• A radius point that is on centre (right cone).
• A radius point that is within a reasonable distance.

So, when we find ourselves determining if radial line will work, we look at those two things. If the cone is a scalene or oblique cone, it will not work. If a radius point is 40 feet away, it is not worth the effort with this process, another should be chosen, but if it will fit in our bench space, then it will work.

Being one of the simplest forms of layout, it allows us to create these patterns with accuracy and speed. If we can use radial line, it is an effective and efficient choice.

Basic Steps

1. Draw a full elevation view and plan view complete with all element lines.
2. Swing the slant height with your compass. Remember, in the elevation view, the slant height is always a true length. This arc is also called the stretch-out arc.
3. Make the length of the stretch-out arc equal to the distance/circumference of the base. There are many ways to accomplish this, but we will focus on the most common method, using step-offs.