On Tuesday we were supposed to start building our birds on SolidWorks based on our Lego models. However, we weren't sure about either of our models. The first model wasn't reliable on creating a smooth flapping motion because it depended on gravity to move the wings up. The bottom parts of the wings that we would be pushing up with our mechanism would be falling down with their weight on the way back. We weren't quite sure if we were going to build this model or not. We then asked Lyn what he thought of our other model and he was concerned that it might not be robust enough. We had already run into issues with the tape that constituted our conveyor belt. Thus, we decided to abandon the second model and look for another mechanism that would allow us to control the upward motion, as well as downward, of the wings. We thought that attaching both of the wings on a hinge and moving the hinge might work better than hitting a part of the wing. We were given an example of a mechanism that moves a rod up and down. We were impressed and inspired by this design and started to draw our bird again, using this mechanism.
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| The piece that inspired us |
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| A sketch showing the list of parts we will need and their estimated sizes. |
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| The sketch of our mechanism with the Delrin rod connectors represented by dark cylinders, used for choosing how to fit the pieces together. |
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We tried to decide on the dimensions of our parts on our sketches. We also had learned about tight and loose fit that day, so we also specified what fitting would be loose or tight on our sketches. That made it easier to see where we would nee a washer and how many washers we would have to make, as well as what the radii of various holes in parts need to be.
The last thing we did was to start building some of the parts on SolidWorks:
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