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  • nanusefue commented on nanusefue's instructable Centrifuge7 months ago
    Centrifuge

    The main reason to build that centrifuge was to extract DNA as pure as possible from the samples. For that reason, the G force in the tubes must be, at least, of 10000 g.Since the rotor is kind of small, the rpm of the motor must be really high. The motor we used from "airplane" and drons models is fast enough but not the ones from the hard-drive of computers.All computer fans use a hall effect sensor to measure rpm, it's said that they are more reliable than an infrared sensor, for that reason I decided to try. It is true that the magnets could come off from the rotor, but it has not happened because I stick it very carefully. The magnets does not affect the balance of the rotor, as I used two of them that balance one to each other (and I used small ones).One possible improve...see more »The main reason to build that centrifuge was to extract DNA as pure as possible from the samples. For that reason, the G force in the tubes must be, at least, of 10000 g.Since the rotor is kind of small, the rpm of the motor must be really high. The motor we used from "airplane" and drons models is fast enough but not the ones from the hard-drive of computers.All computer fans use a hall effect sensor to measure rpm, it's said that they are more reliable than an infrared sensor, for that reason I decided to try. It is true that the magnets could come off from the rotor, but it has not happened because I stick it very carefully. The magnets does not affect the balance of the rotor, as I used two of them that balance one to each other (and I used small ones).One possible improvement would be to print a piece (like a ring) that holds the two magnets and, then you would not have to stick them. But I totally agree that you can perfectly use an infrared sensor.Thanks

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