1. Patterns and Developments
Patterns are used in many types of product designs and forms of manufacturing. Here are a few……
HVAC
Umbrellas
Packaging
Tents
Apparel
Automotive
Sheet metal
Furnishings

2. What is a development?
A pattern of a shape that is laid out in a single flat plane in preparation for bending to a required shape,

3. Surface Developments
Parallel Line
Radial Line
Triangulation

4. Parallel Line Development
All lines are parallel and perpendicular

5. Radial Line Development
The radial line method uses a series of radial generator lines drawn from a common apex point to develop a specified pattern or shape.

6. Triangulation for Oblique Surface
Use Triangulation to get the true size and shape of the inclined surface.

7. Extra material used to connect the pattern into the desired shape.
Laps and Seams
Extra material used to connect the pattern into the desired shape.

8. Single curved surface (cylinder) Double curved surface (sphere)
Plane surface (box)
Single curved surface (cylinder)
Double curved surface (sphere)

9. Truncated Prism
Create an auxiliary view to get the true size and shape of the inclined plane.

10. Truncated cylinder Again create an auxiliary view
Divide the circle and project to the incline
Then project to the right side view