(MBBO#05 Class 2) Flashback GT - Done!

Discussion in 'MBBO 2016 BIKES' started by tjwilson, Sep 7, 2016.

  1. tjwilson

    tjwilson Pro Member

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    I know exactly what you're saying about the welds not looking "pretty" without some sanding and filing. Thanks for the compliment on finishing off the welds but, there's lots of room for improvement in my opinion.

    I'm using a MIG welder with an argon / carbon gas mix. I've used fluxcore on past projects. Especially for areas where I was welding together some thicker pieces. The difference between using gas for shielding verses fluxcore is pretty dramatic in the way the welds look. I've been able to get a far better looking weld using gas.

    Once there's no deadline and, before finishing off this frame, I think I'll run a few tests. Weld up a few samples and smooth the connections with solder, jbweld and aluminum filler for a direct comparison. Will give me a solid understanding of what it's like to work with each and what the final results look like.
     
  2. tjwilson

    tjwilson Pro Member

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    Still picking away at the build. Here's a shot of the top and bottom seat pans.

    seatPans.jpg

    The bottom pan will receive some additional attention later. I had a nice smooth surface along the bottom at one point. That was before deciding I wanted to thin up the profile of the back of the seat. The fill piece took the brunt of the hammering needed to relax the seat back curve. I'll eventually cover it over with another piece. But, this did open the opportunity to try some plumbing solder as suggested by @GuitarlCarl. I ended up with mixed results but the process shows potential.

    seatPanSmooth.jpg

    seatPanSmoothSand.jpg

    Seat mount points added to the frame.

    seatMountPoints.jpg

    Pair of forks cut with a pipe cutter and welded into one.

    fork01.jpg

    fork02.jpg

    fork03.jpg

    fork04.jpg

    The latest wheels before cleaning and re-grease.

    wheels.jpg
     

    Attached Files:

  3. furyus

    furyus

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    Ridiculously cool. Hope this ride is successfully completed and ridden. I'd buy one!

    furyus

    PS: The original wheelset contrasts with the frame better in my humblest.

    PPS: Dude. Marsha.
     
    Last edited: Nov 15, 2016
  4. G-Matt

    G-Matt

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    Wild bike looks like it came right out of a Dr. Seuss book . Love it


    Sent from my iPhone using Tapatalk
     
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  5. LukeTheJoker

    LukeTheJoker Moderator

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    Love your work on the seat, this thing is so cool!

    Luke.
     
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  6. pholTmonx

    pholTmonx

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    The aluminum filler is "for" body filler for aluminum. I've heard people claim can use under powder coat, I had less than awsome results... But it is body filler, not really clear on why reg filler isn't recommended on aluminum, (been almost 20 years paint fumes, but did an Austin and was suggested) but it's a metallic grey, especially under clear.
    Unlike filler w colored cream hardener it comes with white so it doesn't throw color in the mix.
    You can add some fiberglass resin or "filler honey" same stuff, but really don't need add mutch it really goes far, it helps flow out but the more reason the harder to sand. I'm talking add maybe twice the amount you would hardener, it'll perform similar for sanding still...
     
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  7. tjwilson

    tjwilson Pro Member

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    Thanks. Totally agree on the wheels. I even tried to design the "twin" connectors for the curved back frame pieces to echo the recesses on the wheel sides. If the wheels were coaster brakes or, I had another week to whiten the wheels and sort out the brake posts, cabling and levers they would so be on there. They'll find their way back eventually.

    "all I ever hear is Marsha, Marsha, Marsha!"
     
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  8. tjwilson

    tjwilson Pro Member

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    Thanks!
     
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  9. tjwilson

    tjwilson Pro Member

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    The images I've been able to hunt down so far look like aluminum filler would be a great alternative.
     
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  10. tjwilson

    tjwilson Pro Member

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    I started the seat recover by glueing 1/4" dense foam to the seat pan with spray adhesive. With the final vinyl streatched over the foam the shape was too rounded. I ended up removing as much of the foam as possible, adding a backing / thicker layer of yellow vinyl, and then the final brown vinyl covering. Not a lot of cushion but the final shape was exactly what I was after.

    assembledSeatCover.jpg

    Last bit of fabrication, the rear reflector bracket.

    reflector.jpg

    refectorMounted.jpg

    Cleaning and polishing pieces and parts.

    cleanAndPolish.jpg

    No images but, filing down the weld high spots on the frame is underway!
     
  11. metalchewy

    metalchewy

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    That seat is amazingly cool. Great job on it!

    Rear reflector as well!
     
  12. The Renaissance Man

    The Renaissance Man __CERTIFIED DIVER__ (Open Water & Open Dumpster) Pro Member

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    Nice job on the seat. :cool2:
     
  13. LukeTheJoker

    LukeTheJoker Moderator

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    Awesome work on that seat and that crank set will look awesome on there!

    Luke.
     
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  14. tjwilson

    tjwilson Pro Member

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    Thanks. There was a bit of panic when I started to try and pull off the foam from the seat pan. Glad to hear you think it came out well.
     
  15. OneHorsePower

    OneHorsePower

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    it really did ! Awesome work !
     
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  16. Bike Bum

    Bike Bum

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    This bike just keeps getting cooler. The seat is very sleek looking and flows great with the frame. This is one of the bikes I can't wait to see finished.
     
  17. tjwilson

    tjwilson Pro Member

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    A couple welds a little smoother...

    detail08.jpg

    detail02.jpg
     
  18. Chad T

    Chad T

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    Such a cool build! Seat came out great and really fits the style. You've really got some style going on with this one. Love all the little tubes and curves.
     
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  19. LukeTheJoker

    LukeTheJoker Moderator

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  20. tjwilson

    tjwilson Pro Member

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    Last minute finishing, details and final assembly always seem so chaotic. Didn't stop to get any before or in-process images but here are some assembled detail and overview shots. More images in the finished build off thread.

    detailsShoot01_01.jpg

    detailsShoot01_02.jpg

    detailsShoot01_03.jpg

    sideviewShoot01_01.jpg

    sideviewShoot01_02.jpg

    sideviewShoot01_03.jpg
     

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