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Limbi/Spring ’19
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Magnet Test
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Author/s: Samonte, Ridel A. PM and D&M
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For the module-to-module docking, our team have decided to use permanent magnets; specifically, neodymium magnet discs for symmetry. So, how strong should the magnets be?
Well, we want it just strong enough for the two modules to securely dock; if it is too strong, then it might reposition the idle servo (joints of the arm) during module-to-module docking.
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Stuff we will put here woohoo…
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This is the design that our D&M team came up with. For the module-t0-module docking, there will be about 0.05 inches (x2) = 0.1 inches of material between magnet pairs.
Our team experimented with 5 magnet pairs with 5 different pull forces: 1.7 lbs, 5.2 lbs, 9.5 lbs, 10 lbs, 15 lbs.
*Pull force is the amount of force needed to detach a magnet away from a flat surface.
Our team found that pull forces greater than 5 lbs are too strong and caused idle servos to turn during docking. On the other hand, the 1.7 lb pull force magnets are just the strength for our application.
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The reason why we chose magnet discs (instead of magnet strips/magnet blocks/non magnetic mechanism) is because of its symmetry for easy placement and it does not require power. We want to be able to implement the module-to-module docking design in the arm-to-module docking. We currently have our requirement (2.1.15.1) as two separate docking faces for module-to-module and arm-to-module for the module design but we later aim to have a universal (the same module-to-module and arm-to-module) connection later in the design process.
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