Recent content by GiTS

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    Wireless window opener component selection

    I will find one. What do I need to drive it? Will a uln2003 or l293d work? I have those. But they only go up to 1 amp.
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    Wireless window opener component selection

    Thank you. Where can I find an inexpensive wiper motor online? Ebay and google shopping are all in the $60 range.
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    Wireless window opener component selection

    There were errors in my previous measurements! I have new torque measurements and they are MUCH more accurate. New torque measurement is 10.3 oz in or 743 g cm. Thank you for suggestion Baluncore. With the new torque measurements, what motor would you suggest? I would prefer something...
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    Wireless window opener component selection

    Hello, As a project I am making a wireless window blinds controller. It will be a motor turning the handle of the blinds. It may or may not use bluetooth and or wifi. It will be wireless through some means though. The device does not raise or lower the blinds.I measured a peak torque of 2 ft...
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    Creating an Automatic Fish Feeder Without Jamming

    Baluncore, now I get it. I'm going to have a few designs printed up and see how they work. It will take me awhile to make each design in sketchup. Travis_King, that's a good idea. I'm going to post the results when I have something. Thanks for the help so far!
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    Creating an Automatic Fish Feeder Without Jamming

    The motor is very weak, I doubt the vane could actually shear through a pellet. I didn't answer your question well. My fish usually eats 2 times per day, 5 pellets each time. So my design goal is to match that at a rate of 5 pellets every 12 hours. I chose the hopper design because it...
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    Creating an Automatic Fish Feeder Without Jamming

    The motor is a clock movement. So 1 rotation every 12 hours. Or 1 rotation per hour depending on which "hand" i use.
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    Creating an Automatic Fish Feeder Without Jamming

    DScheuf, don't feel insulted because I didn't name it after you. You get the next revision lol.
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    Creating an Automatic Fish Feeder Without Jamming

    Thank you all for the valueable info. What do you think of this new design given the design suggestions? I did not understand what a knife edge is though in reference to wheels. http://i42.tinypic.com/bgp5dc.jpg
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    Creating an Automatic Fish Feeder Without Jamming

    I'm making an automatic fish feeder. It uses a very low torque, low RPM, low energy motor to turn a paddle wheel. The paddle wheel pushes the food off a ledge and into the tank. I plan to make the paddle wheel using a gear. I also have access to a 3d printer to make the part. The motor is...
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    Bottomless fish tank pressure brainteaser

    Link at the bottom if you do not know what I am talking about. Fish tank that works like pet watering bowl. If you poked a hole at the top air would go rush in. If you poked a hole at the bottom water would rush out. At what point in the tank would water be under so little pressure, the...
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    Understanding DDWFTTW: Exploring Its Principles and Addressing Common Questions

    Assuming there are no losses to friction, what's the maximum velocity ratio (wind-cart : wind)?
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    Understanding DDWFTTW: Exploring Its Principles and Addressing Common Questions

    I came across this youtube video. It explains what you both are explaining. The key to the contraption working seems to be the angle of attack of the prop blades creates for force in the forward direction than the downward direction. If the angle of attack was steeper, the vehicle would go...
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    Understanding DDWFTTW: Exploring Its Principles and Addressing Common Questions

    Ddwfttw Direct Down Wind Faster Than The Wind. First, I am not refuting that it is true. I've seen the videos and believe. Second, this is about the treadmill test with no apparent wind. Third, I am looking for an explanation of how this works from someone who understands DDWFTTW...
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    Battery to replace chemical electron donor

    In reactions that reduce organic compounds through donation of electrons, can a battery substitute as an electron donor? In a typical mercury/aluminum amalgam reaction, aluminum donates the electron to the compound that is going to be reduced. The mercury serves as a mediator for the...
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