Vestas Wind Systems A/S, the world’s largest producer and manufacturer of wind turbines, used Excel to run tolerance analyses combined with some trial and error on the prototypes for a new design. During one final test before shipping the first unit to the field they realized that the spinner at the center of the blades was colliding with the fixed nacelle. The required gap in the design wasn’t there in the actual assembly. What would they do? What would be most effective in terms of cost and time? Would they change the design - an engineering change could cost 5000€ for just the paperwork? Before understanding the cause of the problem one consideration was making adjustments at the time of final assembly in the field. Before changing anything, though, they used CETOL 6σ for PTC® Creo® to understand the true cause of the problem and explore better alternatives for resolution. Attendees will learn how Vestas explored both manufacturing and design alternatives to enable them to solve their hub and nacelle issue. They will learn how to apply the same methodology in their design process by incorporating tolerance analysis tools, such as CETOL 6σ.