This week is different because there is only a group project. The assignment is to design a machine that includes mechanism+actuation+automation, build the parts and operate it manually.
We decided to make a rotary attatchment on an old machine that has been in the fablab for some time now. We whanted to get the machine up and going since it is sort of a relic.
You can see a detailed documentation on our
group site.
Me and Bergþóra designed a four jaw chuck that will keep the part we want to cut in place and turn it around. We decided to make it 4 jaw so we could also cut square things. We looked at a few design online until we found one we liked. We then remade it so it would work the way we wanted it to. I am really happy with the end result and it workes well. I learnd alot designing it in Fusion 360. We made a pattern to make the ruffles and the holes I had never made a pattern before so that was new. The top and the middle part both have the same 4 jaw slot design but it is mirrored on one part (the curve of the slots is the same as the curve of the outsides edges of the part). When you put those two parts together you can align it so that the end of each slot on the middle part is located directly beneath the end of the slot on the top part. That is where the lugs go, and if you rotate it the lugs move to the center of the part which tighthens the grip on the part we're milling. The bottom part and the middle part fit together to make it easier to turn it. On the top of the bottom part there is a guide for the lugs. The outside of the bottom and the top part has a knurling.
I think to take the design to the next level we could make another holder on the other side so the thing that is being cut could be more staple.