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Engineering
Mechanical Engineering
Designing a Geneva Mechanism: Overcoming Challenges
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[QUOTE="DefinitelyAnEnjinear, post: 6654670, member: 691314"] I don't follow what you're calling input and output, since in the traditional design the driving pin (here, a dial-in green) is the input. The pins are on a part that will remain stationary, for the dial (in green) to push against. As for a slot on the input disc, do you mean the top, smaller gear? the slot there is just so I can connect it to the rest of the pieces (these designs were done with 3D printing in mind). If you're talking about something like this [ATTACH type="full" alt="1658408703633.png"]304572[/ATTACH] I have tried to understand the math behind its design before, perhaps I should give it another go. I went with something I knew how to design and didn't really consider this design when I ran into the jamming problem (since I wasn't even sure if what I'm trying to do is feasible, thanks to my lack of engineering knowledge...) That's a bit complicated: I have 8 pins uniformly distributed on a circle. I need to push, then pull each one of them sequentially, and I'm trying to use as few parts as possible (so having one mechanism for each pin is not an option). I can't have a mechanism that is always engaged with the pins either - it needs to engage, push, pull, disengage. To do the pull+push, I figured I would go with a scotch yoke. here's a quick mockup: [ATTACH type="full" alt="ezgif.com-gif-maker(3).gif"]304581[/ATTACH] I can't have the pin driving the scotch yoke rotate around the center axis, because I need to mount more things above it on the same axis. so since the pin driving the scotch yoke can't rotate around the central axis, I came up with the idea of having a geneva mechanism with the driving pin/dial (the green part in my geneva mechanism design) mounted on the geneva wheel, and I will have the pin driving the scotch yoke mounted on the same axis as the driving pin for the geneva mechanism.... I hope that all made sense I'm going to try and understand how to design the normal geneva mechanism I posted and see if that one doesn't jam up on me. [/QUOTE]
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Designing a Geneva Mechanism: Overcoming Challenges
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