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  1. M

    Motor torque for auger - source of 20 RPM AC motor + gearbox?

    Hi, Issue: I'm looking for a motor, preferably AC, with a stall torque of at least 20 Kg(cm) that runs at between (about) 10 and 30 RPM. Do you know of any sources? Background: I'm building an auger to feed powder to coral in an aquarium. There will be a hopper filled with the...
  2. M

    Do I need to use a fuse?

    I'm building an automatic feeder for an aquarium. A timer will be plugged into the wall. An Ericsson Model 420AS44001 power supply (DC6V, 700 mA) will be plugged into this. This will energize two motors, each rated for 6V. This feeder will run unattended. I want to avoid a fire. I'm...
  3. M

    I need to time an AC outlet by seconds, or a break in a DC line

    PROBLEM: I am about to lose my mind. I am trying to accomplish what should be a really simple project. I am trying to automate feeding in an aquarium. For various reasons, commercially available feeders won't work. From a mechanical perspective, I can build one. Timing one is quite...
  4. M

    Fire hazard with small DC motor jamming?

    I'm building an automatic fish feeder. First and foremost, I want to avoid starting a fire. Without knowing too much about electronics, it's my understanding that higher operating temps and higher voltage means higher fire risk. I'm planning to have a small DC motor run off of a wallwart...
  5. M

    Looking for a small, low rpm, higher torque motor. Help please?

    I'm looking for a motor to put in an array of four other motors to be run for a long time, and off of a computer power supply. I'm looking for one that can, for all intents and purposes, go "infinitely" slow, by limiting current with a potentiometer (does such a thing even exist?) At most...
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