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Thread: Two Stage Mechanical Oscillator Replication

  1. #21
    Hi Gary,

    Today I learned, "This is normal behavior and caused by the bicycle lever seeing more weight at the top of the backward swing than it does at the top of the forward swing due to the position of the swinging weight on the pendulum."

    Yes of course, "The farther away from a pivot point on a lever the mass is, the more torque it applies to the lever." Don't I feel silly, but seriously I hadn't noticed that before with the two stage oscillator, thx. Well ... uh .... sounds like you have everything under control.

    Will be interesting to see if you can get the whole thing working with power out from the lever end, sounds like you will use a crankshaft to spin a "flux gate" generator, which would be interesting sans the whole two stage oscillator part.

  2. #22
    Hi Paul,

    Quote Originally Posted by ZPDM View Post
    .........Will be interesting to see if you can get the whole thing working with power out from the lever end, sounds like you will use a crankshaft to spin a "flux gate" generator, which would be interesting sans the whole two stage oscillator part.
    We plan to use neos connected together by steel bars swinging past two stationary coils. I don't think a crankshaft/connecting rod would work very well at converting the uneven oscillations into rotary power. And at 1.25 rps/75 rpm wouldn't produce much electricity in a small rotary generator.
    Last edited by Gary Hammond; 05-02-2019 at 12:26 PM.
    Gary Hammond,

  3. #23
    Hi Gary,

    Yes, I was thinking it might be hard to get a crankshaft to flywheel to work well, but then again who knows it is all unexplored. Your idea sounds great. Might only add a couple percent but you could consider piezoelectrics as the bumpers for the max/min of the lever oscillation. I think I saw Velko doing something with piezos. Could always increase those rpms if you go loop the loop, sorry, you and your grandson are the ones doing all the work, I'm just the guy that is excited because I wanted to do something similar.

  4. #24
    Hi Paul,

    Quote Originally Posted by ZPDM View Post
    Hi Gary,........Could always increase those rpms if you go loop the loop ..........
    Not sure that closing the loop would increase the frequency/oscillation rate/rpm. The oscillation rate is mostly determined by the mass, cg, and length of the pendulum. Stronger pulses cause it to swing faster, but also farther at the same time. They tend to cancel each other out. Shortening and lengthening the pendulum, however, greatly influences the frequency ..... just like adjusting a grandfather clock.
    Gary Hammond,

  5. #25
    Networking Architect Aaron Murakami's Avatar
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    I mentioned 3 coils and one magnet, with attraction mode, you'd still might not trigger it well.

    With 1 SG coil - just put 3 magnets with with spaces between them on the pendulum. It would be like a piece of a wheel with a few magnets. That one coil will go as high as you need. Keep the setup like you have it, just add 2 magnets - one on each side. Make some little retainer to attach to the pendulum and you're done.
    Aaron Murakami





    You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete.” ― Richard Buckminster Fuller

  6. #26
    Hi Aaron,

    Quote Originally Posted by Aaron Murakami View Post
    .................With 1 SG coil - just put 3 magnets with with spaces between them on the pendulum. It would be like a piece of a wheel with a few magnets. That one coil will go as high as you need. Keep the setup like you have it, just add 2 magnets - one on each side. Make some little retainer to attach to the pendulum and you're done.
    I think this would work great if the pendulum pivot point wasn't moving up and down as the pendulum swings. But if the magnets are spaced 2.5 magnet widths apart, by the time the outside magnets are nearest to the core the whole pendulum pivot is not at it's lowest point. If the magnets are spaced closer together it might not work well either?

    One thing I like about attraction and then repulsion is it assists the pendulum in it's natural movement first toward and then away from it's lowest point as the pivot point moves up and down. It not only assists the swinging, but also assists the up and down effort at the same time.

    The more I think about it, I'm leaning toward the Bedini/Cole bipolar circuit with two separate trigger coils wired in opposite directions.

    But today, my grandson was here for shop class and we discussed everything on this thread so far. We concluded maybe we should change our focus and work out the generator end first to see what is really needed to drive it. We cut the fork tube off the frame and made a bracket to carry the magnets and shunt bars I used previously on the G-field generator I built that was driven by my attraction motor. We are also going to use the coils from that same generator.

    Next week we will weld the magnet assembly to the bicycle frame and mount the coils to the wooden A-frame. Here's a picture of what we got done today. The parts are sitting on my cnc mill waiting to be welded together. The coils are also there for the picture so you can see how it will work.

    DSC06975.jpg
    Gary Hammond,

  7. #27
    Hi Gary,

    https://www.youtube.com/watch?v=3nik7JyNRbE

    At around 8:32 Veljko starts a discussion of a, "Fast Model with Eccentric Rotor" He notes you can run it at 12,000 RPMs. This two stage oscillator set-up will work with any unbalanced rotor. As energy imparted should increase with square of velocity, I think one issue is just how sturdy is the set-up as by design it will want to tear itself apart with a spinning unbalanced rotor. I suspect, but this is a guess, the lever arm will also only have one behavior with a full rotation, not the two seen with the half swing pendulum set-up. The other cool thing demonstrated in this part of the video which I had forgotten about is he demonstrates no change in amp draw with loading of the lever arm as opposed to loading of the drill bit side. Not wanting to come across as pushy, just mentioning some other things that might be fun to look at at some point.
    Last edited by ZPDM; 05-03-2019 at 01:41 PM.

  8. #28
    Hi all,

    Here's an update to our two stage oscillator project. We got the genny coils mounted and checked the output which is pretty low. The wave form is shown in this photo.

    DSC06977.jpg

    The genny coils are shown in this photo.

    DSC06976.jpg

    When the magnets were moved closer to the coils, the frame wasn't rigid enough to keep them from dragging. So we added some stiffeners to the frame and we still need to add a few more.

    The voltage doubling setup gave us about 4 volts DC and would light a string of LED's. We need to get a lot more voltage than this to charge a battery. So we are going to replace the pendulum with a weighted bicycle wheel and try spinning it with an SSG circuit. If this works, we may power it with a split the negative battery rotation scheme.

    When we placed the unit on the concrete floor with the pendulum installed, we had to hold it down as it was bouncing up and down. So however it's driven, it will need to be anchored down securely.

    The video is in the next post.
    Last edited by Gary Hammond; 06-07-2019 at 11:55 AM.
    Gary Hammond,

  9. #29
    Here's the video. It refused to attach to the previous post.

    Gary Hammond,

  10. #30

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