The face--and no this is not a photo of a real Oreo ;)
Side view, with cream (double stuf!) and a splash of milk on one side. Doesn't it just make you want to take a bite?
Manufacturing and Assembly
The next step in the process is figuring out how the parts will be manufactured and assembled. We plan on injection molding the cookie pieces and the cream pieces. Injection molding will allow us to capture the details on the face of the cookie. The milk splash is thin enough to be thermoformed, which is cheaper and faster than injection molding.
In terms of assembly, first the cream pieces will attach to the spoke (for string to wind around) in the center of the yo-yo. Following that, the cookie pieces will snap onto the cream pieces as shown below.
Finally, the milk will sit just a tad higher than the cookie, extending out through the splash shaped hole in the cookie. The milk will have some extra material around it that will sit between the cookie and the cream, holding the milk piece in place.
Principles of Design for Manufacturing
The foundation of our team’s yo-yo design is in the careful attention to detail and meticulous replication of the real Oreo’s features. Because of the extra layer of detail, our team also paid careful attention to designing our part for manufacturing, in an attempt to make sure our designed features were realised in the final product.
Both of our thermoforming and injection molding teams kept slight draft angles on the parts to help with ejection. Our design abstains from having any sharp corners, but instead is designed with carefully selected fillet diameters to account for end mill radii. In an attempt to decrease total machine time and accessibility of milling tools, our team designed the oreo face pattern scaled larger than it is on the real Oreo. By doing this, the mold teams are able to machine the features with a 1/16’’ end mill, as opposed to machining all of the finishes pieces with the engraving tool.
Lastly, another design for manufacturing consideration that was taken into account was the thickness of the thermoformed creme. Because the inside of the creme is hidden by the cookie, we made sure to bore out the insides of the cream. In doing this, not only is it less material use, but it also helps to decrease the total cooling time of the piece.
Table of Specifications
This table of specifications is what we used to dimension our yo-yo. The critical dimensions are at locations where two pieces have to fit together.
Gantt Chart
Here is our Gantt chart, laying out our schedule for the rest of the project. Wish us luck and keep an eye out for more updates!
