With a (somewhat) complete model sketched up, the group has a discussion on the specific parts needed. As the deadline is approaching, we needed to:
a) select which specific materials we need for each part
b) the type of material we need for each part
c) what vendors to buy from

The group decided on this parts list:
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…and the order was placed!

With some of the arm sizes and necessary movements, Mitch is hard at work updating the 3D model to incorporate the updated calculations.

With the candidate bioreactor modeling underway, the group needed to figure out the mathematical measurements for achieving the range of shear stress we aim to perform. This range (tentatively 0.05-0.25, with 5-6 equal increments and one control) was extrapolated to the amount of movement the machine needs to perform. These measurements will be incorporated into the model. The next steps are to update the model to fit.

With Mitch’s initial 3D model, Pete helped the group think about the specifics of how the model will work. This process included thinking about mechanism and movement mechanics and trying to fit them within this model and current design. This exercise was completed by projecting the current model onto the SMART whiteboard and drawing additions onto it.

Mitchell has done a great job rendering our best candidate bioreactor model in 3D with Google Sketch-up. Although all the minute details and kinks are not figured out, this provides a great basis to work with and delve into specific measurements and ideal shear force generation.

With our needs/problem statement revised and having had a session on sketching, the group came together to present some candidate sketches to accomplish these goals. Here are some of Grace’s sketches/schematics