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#31
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Re: CIM motor + Electrical outlet = ?
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I've spent a lot of time crawling surplus sites (usually for 540 sized motors), there are a lot of cheap, slow, torquey motors out there. What's nice about that is you really don't have to do much, or possibly no, gear reduction, and depending on what you buy, they could have a nice low efficiency worm gear to hold it in place. |
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#32
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Re: CIM motor + Electrical outlet = ?
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OK, so I think everyone understands that a CIM is probably a poor choice for this application. 120 VAC will smoke it immediately, a 12V power supply big enough to manage it will be expensive, and 120 VAC geared motors are plentiful and cheap. Al spoke about electrical safety: heed his words if you enjoy living. Even an accidental brush against 120 VAC can be fatal. That would ruin your day right quick. Setting the house on fire is just a side benefit. Also consider mechanical safety: The whole system needs to support at least 3 or 4 times the heaviest weight it;ll ever see, and if it were mine I'd go for a factor of not less than 10. If it were to break, the damaged TV would be the least of the problem, since the pole embedded in my cousin's chest will really cheese off Aunt Sally... |
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#33
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Re: CIM motor + Electrical outlet = ?
If I was looking to do this project on the cheap, I would look for things that already do the motion that you require.
For example a drill press table travels up a pole (using a rack and pinion), and also can swing around the pole. So you could buy something like this http://www.harborfreight.com/16-spee...ess-43378.html Stick a low rpm high torque motor on the lifting crank, and then drive a firction wheel on the horizontal surface of the column to rotate. If you wanted to separate the 2 mechanisms i would move away from a pole and use drawer slides on a vertical frame, and then pivot the frame at the bottom like a turret using a lazy Susan bearing. Without knowing the specs of your tv/system it is hard to recommend a motor. On the cheap side of things I will echo finding something at http://www.surpluscenter.com/electric.asp on the expensive side you can find something exactly speced for your project at http://www.grainger.com |
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