In this blog post we would like to discuss some of our CAD models which depict the optimization changes that we proposed in our previous post. To summarize, we intended to (1) redesign the two part, split-bow design to instead consist of a single bow for ease of manufacturing, (2) move the crank assembly all to the left side of the bow to increase structural stability, and (3) Remove the excess material from the underside of the body and instead replace it with an optimized mesh design that is only possible when 3D printed. The completed CAD files in .ipt form are attached below.
In Figure 1 below, all three design changes can easily be viewed.
In Figure 2, a close-up view of the new bow design can be seen. The open edge of the body allows the bow to easily be attached or removed. Material was not necessary here since the bow will not be exerting any force in this direciton.
Figure 3 shows the redesigned crank which is attaches the crank itself, directly onto the latching gear on the left side of the body. This allows most of the crank mechanism to be manufactured as a single part, allowing for increased strength and fewer components.
Figure 4-6 Depict the modular body design that was created for the device. In particular, Figure 4 shows the cavity where the redesigned mesh will ultimately fit. In Figure 5, the FE analysis that was performed on the device is shown with the cavity highlighted. Since the FE analysis is a preliminary one, Figure 6 only depicts a 2D form of the optimized mesh which will slide into the body cavity. This optimized mesh design will see multiple iterations in the future.
