Team Website!

Our Team has been working on a website in addition to a blog to keep a more detailed track of the project as is progresses. Click the link below to check it out!

http://2008team.wix.com/around-the-world

Part STL files

https://www.dropbox.com/sh/5nqgzxin2fqlz9k/AACDpdpQhOYN_0KWCK_SyFG5a?dl=0

Earth Cap STL

https://www.dropbox.com/s/f8o02y23lq18rux/Earth%20Cap%202.008.STL?dl=0

Injection Mold: Outer Ring

Ring Mold Models (molds currently still in production)

Cavity Mold

Core Mold

Diagrams of the outer ring mold are shown above. Potential rework on the ring mold largely centers on the press-fit aspect of the ring size. Because the ring must sandwich the thermoform plastic dome piece onto the yo-yo base, shrinkage and tolerances are the most important factors. Before optimization runs, it will be important to check the fit of the ring over the base/thermoform parts and adjust any features to account for minor changes in the base/thermoform shape or thicknesses.

Injection Mold: Yo-yo Base

A picture of the mold for the base of the yo-yo is shown below. Some key features, such as the sprue, the runner, the center shaft, and the ejector pin holes, are labeled. A more detailed description of the base mold and the base part can be found in an earlier post, "Yo-yo base: An injection molded part."Since the base is the largest part, we are going to try to avoid needing to change the base. If there need to be adjustments for snap fits, we shall adjust the earth cap mold or the ring mold, keeping the base the same.

Injection Mold: Spaceship and Moon Ring

Cavity Mold 

Core Mold w/ Shutoff surface

The possible changes we will make to this mold will be to increase the diameter of the sphere side so that it can be more easily machined with a ball endmill of the appropriate diameter, and to change the basic shape of the spaceship side of the spinner to a bit more elongated and a less narrow nose, so that the tight corners and radii can be machined without ordering more expensive tools and without sacrificing the precision of the machining.

Injection Mold: Earth Cap

Possible changes we may need to make to the molds are the inner diameter of the bottom of the Earth Cap, if it does not fit with the post after shrinkage/ if the ejector pin effects it in any way.  Also, we may need to add draft angles to the part if it is not ejecting well.