Johnny1360 Posted July 19, 2018 Posted July 19, 2018 Maybe support the arm under the drum at both ends mounted on turntables, then the whole arm can just rotate the drum into an upside down position. Quote
tkel86 Posted July 20, 2018 Posted July 20, 2018 Hav you tried to lift the arm, with the drum turning? I'm curious if the centrifugal force have any impact when lifting? Another ideia, maybe too much crazier, but hey upside down people is not exactly the safest thing. Quote
Marxpek Posted July 20, 2018 Author Posted July 20, 2018 2 hours ago, tkel86 said: Hav you tried to lift the arm, with the drum turning? I'm curious if the centrifugal force have any impact when lifting? Not with a technic built solution. But in the demonstration video i could clearly feel the gyroscopic effect: the spinning motion makes it want to stay in the same spot, so the lifting force needed is increased a lot. Lifting or pushing it to 90 or 180 degrees is doable with the curvilinear actuator i made. But getting it back from the inverted position is very hard to do without breaking Lego.. But since i got a lot of support and ideas from you all, i decided to stick to the drum build and not go for a new idea. My goal in the competitions is always to come up with something new or original so i do not just want to recreate the real ride. I want the drum to go inverted, that is what impressed my 5 y/o daughter and the sole reason i went for this prototype (out of 3). I will retry the lifting arm with some of your ideas and if that fails again, i will go for the 2 towers setup (this idea is starting to grow om me since it is a never seen before ride) Thanks for your input and keeping me motivated! Quote
Marxpek Posted July 21, 2018 Author Posted July 21, 2018 (edited) seems i already was on the right track with my previous actuator: The offset ring was the key for strengthening the whole thing, it also helps with mounting it to the arm of the ride. in the picture we see a old version of my actuator that failed, in the current version the ring is closed and just 2 wide in stead of 3, but it still has the offset for strength. In the end the solution was pretty easy, while the forces are huge, it works, this thing is not really well braced or balanced yet, considering that i call this a success, as you can see/ hear i pushed the arm a bit too far on this test and as it wobbled a bit, one of the figs started to sag down and hit the table, causing more instability, but everything stayed in one piece and no figures where lost. Next step would be to redesign the drum and after that redesign the arm. Edited July 21, 2018 by Marxpek Quote
mocbuild101 Posted July 22, 2018 Posted July 22, 2018 Nice work It's great to finally see it working! Quote
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