Bedini RPX Sideband Generator



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Thread: The Toy Build

  1. #1

    The Toy Build

    This is a very small build I am calling "The Toy".

    It is another 3D print model but simplified even more than the first one I posted. The parts for this are very minimal intentionally. It is very small having only a 50mm wheel. The deck is approximately 5 3/4 X 4 3/4 inch.

    I have only run it a short time so far because I just finished building it last night but so far it works nicely. In mode one it is pulling about 150ma at 6V and around 300ma $ 6volt for common ground mode. I still need to do a lot of testing at different voltages but I started on the 6 volts 5AH that I have. I think it would run fine on soe 18650's or similar as well.

    Anyway I will post some build files once I have tested a bit more with it.

    BZ-Toy Bottom.JPG

    BZ-Toy Angle.JPG




  2. #2
    Hi Bob,

    That looks pretty neat! And just in case you missed it, I sent you a PM.
    Gary Hammond,

  3. #3
    Senior Member Tom C's Avatar
    Join Date
    Jul 2012
    Pacific Northwest

    the trigger bracket is awesome!!

    Tom C

    experimental Kits, chargers and solar trackers

  4. #4
    Thanks guys.

    I wired this one up with a small SSR but I am also going to try a BJT build on this platform.

    Gary I just checked and there was no message from you, don't know what could have happened. Can you send again?

  5. #5
    Very cool Bob, keep up the great ideas.

  6. #6
    Hi Bob,

    I re-sent the message.

    Quote Originally Posted by BobZilla View Post
    Thanks guys. ...............
    Gary I just checked and there was no message from you, don't know what could have happened. Can you send again?
    Gary Hammond,

  7. #7
    I made a slight improvement the base piece. Previously I had posts there for mounting store bought terminal blocks but I created terminal blocks on the model instead. These will work by slipping a square nut into the slot and then using a #8 screw and washers on top. Saves about 10 dollars on parts.

    Also in this shot you can see better how the axle is desighned. It is not one piece with the base. Originally I did have it all one piece but in printing it the supports were terrible and the roundness of it was not as nice. It is a separate part that should be printed at 90 degrees so that no supports are needed and teh printer can make a nice circle, then it has a plug to fit into the base.

    BZ-Toy Base.JPG

  8. #8
    Quote Originally Posted by Richard View Post
    Nice terminal arrangement, Bob.
    Now we just gotta find those square electrical washers that are so common with terminal strips but I've never seen them available for purchase separately.
    I thought so at first too but with how I am doing this you don't need them. The square nut anchors the screw as you tighten it and with two washers up top you can sandwich a ring terminal between and have a tight connection.

    Here is a pic of one I actually printed:
    BZ-Toy Base_2.jpg

  9. #9
    Senior Member John_Koorn's Avatar
    Join Date
    Jul 2012
    Melbourne, Australia
    Awesome work Bob. Thanks for sharing.

    Looks like you've got 3D printing down pat

    John K.

  10. #10
    Thanks John. Yea I m getting the hang of it. For everything you see there are probably 40 versions leading up to it, not major changes but little changes here and there.

    So here is a little update on this build. I have made a BJT driven version of it but it was not without it's problems. Over all I think this machine is worth pursuing further so I am going to try some adjustments and see if it gets better but as it is I don't think it's worth putting out for others to replicate if they want too. Unlike my other machine this one is just not top quality, at least not yet.

    So I rolled a coil with a trigger (30awg) and a power (24awg) on the same spool in the traditional manor except not litz'ed. My thought was to have the trigger coil on the right, a slave on the left and keep the middle for a genny which is why I put that 3rd terminal block in the middle. Well I could not get enough current or voltage ( not sure which) to fire the transistor from such a small coil. So instead I rolled the genny coil (30awg) and put it in the middle pole and used it as the trigger. The two side coils are in series and it's all connected up to one transistor. It does run this way and the charging was just meh, not spectacular. It was enough to keep me interested in developing it a bit further.

    So I have in mind now to make some changes. I have ordered some much lower powered transistors which I hope I can get to fire from the traditional 2 filer setup. I am dropping the power down to 28 awg so that hopefully I can get away from doing the series configuration. I had only done that to increase the resistance, otherwise it would have pulled too hard.

    Another issue with the original builds is that I can tell the bearings are getting pulled on by the magnets, it's only a 50mm wheel. So I have two changes in mind for that issue. First I am dropping down to a 1/8th inch diameter magnet by 1/8th inch thick ( current ones were 1/4 x 1/8. Additionally I am going to try an all ceramic bearing, nothing too fancy. I found some that look like they may work for about 9$ a piece but I am designing the wheel in a way that it will only need one. If that works it is actually cheaper than the two steel bearing I was using on the first model.

    So we will see how this goes going forward. I love teh idea of having a bedini wheel that fits in the palm of your hand which is why I want to keep going on this. It could become a great first build for people but it has to work right of course.


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