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Thread: Jelloir's SG Build

  1. #1
    Senior Member jelloir's Avatar
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    Jelloir's SG Build

    This Easter long weekend I began my SG build and thought I would document my build progress.

    To start with here is the frame (not yet complete). The wheel is just balancing for a picture and I haven't fixed the wooden struts for the wheel to the base yet. The plan is to have the struts for the wheels adjusteable so I can swap for a larger wheel easily if I want. I may also make the coil platform height adjusteable for fine tuning the space between the magnets and the coil. The base it a bit longer so I can fix my transistor board and comparator on the side for easy access.

    By the way, anyone looking to build one, the teslagenx.com 8 transistor kit is a piece of cake to put together. Very glad I ordered that and my other components through them.

    Build Pic 1.jpg

    Build Pic 1_adjusteable_strut.jpg

    James
    Last edited by jelloir; 04-18-2014 at 10:35 PM. Reason: Added pic of struts

  2. #2
    The frame looks very nice!

    Question about your wheel. It looks like you have attached a fixed axle to it , is that correct. Are those bearing housings in the picture? I'm curious about your axle and how you are mounting it. Could you elaborate on that a little, maybe get some closer pictures of the wheel?

    Over all it looks like a great start for your project.

  3. #3
    Senior Member jelloir's Avatar
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    BobZilla, What your looking at are "pegs" for a BMX, they will be mounted with pipe holders. I am going to place a thin piece of rubber between the pegs and the pipe holders so they grip well and reduce a little bit of vibration.

    pegs.jpg

    pipeholder.jpg

  4. #4
    Senior Member jelloir's Avatar
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    Mounted Magnets

    For the 24 magnets I created a 15 template using some card paper and marked the rim of the wheel. Magnets now mounted!

    mountedmagnets.jpg

    15template.jpg

  5. #5
    Ahh ok now I got you. I did not realize they made pegs with such a large diameter. When I was a kid I did some free-styling but the pegs were narrow, almost like a bunch of nuts just welded together.

    Your magnets look just a bit close together but hopefully it will not be a problem. It is a very nice looking build. Can't wait to see you do your first runs with it.

  6. #6
    Senior Member jelloir's Avatar
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    Thanks for the feedback BobZilla. I'm a little concerned about the magnet spacing now, SG beginner book says 24 magnets on a 20" bike wheel, but also states 3" spacing. I guess I will run it and alter the spacing if required.

  7. #7
    Senior Member jelloir's Avatar
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    Coil Platform and Wheel Mounted

    Just a quick couple of updates. I remembered I had some nylon nuts and thread so used them to create a spring loaded platform so I can adjust my coil height easily. Plan is to insert a wood shim and then screw the base down again against the shim. I can see myself being tempted to adjust while it's running but must resist that urge Also mounted my wheel after finding a scrap bit of rubber at the hardware store.

    nylonscrewscoilbase.jpg

    wheelmounted.jpg

  8. #8
    Senior Member Tom C's Avatar
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    24 seems a bit hi, On a 26 inch wheel 21 magnets will give you 3.9 inch spacing, its a matter of a decent south between the norths.


    experimental Kits, chargers and solar trackers

  9. #9
    Senior Member jelloir's Avatar
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    Smile Its Alive

    It's 2am and I couldn't wait any longer and decided to connect some dodgy batteries and cables and spin up! Need to get some good batteries and re-cable everything with the 6mm cable I have lying on the floor. Think the wheel might need more balancing, but it's humming along ok, hell yeah!

    Soon I'll have my comparator on there once it's tidied up. I have a tachometer and clampmeter ordered, sweet!!

    I'll get a vid done soon also, but need some shut eye.

    itsalive.jpg

  10. #10
    Senior Member Tom C's Avatar
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    nice build, great work, I really like how you mounted the axle, elegant and effective.
    Tom C


    experimental Kits, chargers and solar trackers

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