Design Review Follow-Up

Our design review went well, and we received helpful feedback from those in attendance for our next steps! The feedback we received can be found below:

• very creative design/name. Nice CAD work (Exploded vs sectioned views). I like the call out on McMaster Carr items. Nice awareness of ejector pins, parting line, draft. I like the annotations during ppt. watch units on ppt? I think both English and metric were shown? could have helped to have the units shown?

• Great job!Great job!

• I like the design a lot! I am skeptical that the piano keys on the thermoform would show up. The keys should be spaced out more and made larger I think. You can definitely test this out pretty easily and see how it comes out as a sanity check. How did you choose how many keys you wanted on the yoyo? You might want to decrease the number of keys to make the part a little less complex. I am still not completely sure why you were planning on incorporating a ball bearing. It might make things a little complicated. I think it might just be easier to replace that inner dome part with flat faces so that you get more uniform thickness and so that it is easier to machine. I think the small channels in the white part will probably be problematic. Maybe you can laser cut the part? Or instead of having the keys be fingers, you could just have channels between (depressed lines to give the illusion of the key outline). You could also have the black keys go on top instead of poking through since the alignment of the white over the black might be difficult. You might want to be wary of over-constraining things. Having just one press-fit point will be a lot easier to manage than four. Also the alternating between putting keys on core or cavity side might be a little complicated because you need to have perfect alignment to create shutoff surfaces.

• I love the risk mitigation planning! Awesome contingencies. I was wondering if the multiple interfaces of press fitting is any cause for concern? Could cause some issues with such small gaps, one instance of flash may make the part unusable for your assembly. I also agree with timothy, the small gaps will make things difficult in injection molding.

• You seem to have a very good understanding of the total process. I like that you made the snapping part symmetric. That will help with assembly. Alternating the keys between mold sides is a great idea. Be careful to make sure you don't make the keys too high on either side as it will cause flashing.

Following the design review, we have updated each of the three injection molded designs slightly to ease our manufacturing process, interferences, and accommodate for the commercial parts we are going to buy. We also 3D printed the stand mold as designed to determine the fit with the model yo-yo we printed, and the resolution of the keys as designed. Photos of all of those steps can be found below. Additionally, we have generated a more detailed schedule and assigned roles for our manufacturing, anticipated iteration, and assembly steps for the coming weeks.