This section focuses on the iterative evaluation of our manufacturing process. It begins with a discussion of our preliminary method then transitions to our final process. Lastly we conclude with our lessons learned.
Preliminary Method
We simulated the pick and place mechanism using Creo Parametric. After slight fit adjustments and multiple evaluations, we converged on part geometries. Once finalized, our team set out to manufacture our first prototype.
We had decided to laser cut acetal delrin sheets (12"x12"x1/4") for our long, planar links and 3D print parts with intricate geometries such as our custom gears (pictured below.)
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Upon inspection of the laser cut links, we discovered visible heat damage and material expansion.
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Furthermore, due to the nature of laser cutting, the holes in our delrin had a slightly angled edge. This complicated our initial goal of press fitting bearings and rods into the material. While we did plan for this in our initial attempt by only cutting pilot holes, our method for expanding those holes with a drill press did not yield desired results. The accumulated error from this design process did not allow for smooth and repeatable motion of our fully assembled system.
Final Method
Lessons Learned
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