Deliverable 4

Today began the project of assembling our yo-yos. Here are a few pictures of each component, and two final yo-yos.

Hamsters on connectors and bearing

Cages

Body Pieces

Connectors

Thermoformed Cover

2 Completed Yo-Yos

Two friends, going for a run

Overall, the yo-yos fit together almost perfectly. The press fits with the hamster-connector, and the connector-bearing were excellent, and every cage fit into a body piece with minimal bending of the posts. There seemed to be some uneven shrinkage of the cage, which caused a little bit of warping on the cross bar, but it did not effect how well the pieces connected. Our biggest issue was with the bearings, which didn't spin as smoothly as desired, so ordering higher quality ones would greatly improve performance of the spinning hamster..

By measuring a few key dimensions, we are able to see how well our production yo-yos match our Solidworks designs.

Many of our pieces actually fell within our tolerances. The body thermoform groove ID, the cage post OD, connector diameter and hamster dovetail were all within the spec, and the thermoform diameter was out of spec, but very precise. The flexibility of the thermoform piece makes it a forgiving piece, so they all still fit well within the groove on the body.

In addition, our connector piece was optimized further by remachining a lip separating the face from the outer race of the bearing to reduce friction, and this worked successfully.