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

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

  1. The Renaissance Man

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

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    Good plan, I like the bare metal also. Plus you don't have to be so careful with it!
     
  2. OneHorsePower

    OneHorsePower

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    +1 for bare metal , the steel already look pretty darn good
     
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  3. OddJob

    OddJob

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    ++1 on the bare metal. It's prototypical look begs for an unfinished surface. This bike is really cool! Well done from concept to reality.
     
  4. GuitarlCarl

    GuitarlCarl

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    Bare metal with DupliColor Effex clearcoat. It has a fine multicolor shimmer to it in the sunlight and when there's no light it looks bare metal, no powder dots...
    DSC00704.JPG
    The picture does it no justice, it's better in person.

    Carl.
     
  5. pholTmonx

    pholTmonx

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    Plus one bare just because you can.... Show it off proud nekid
     
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  6. Dr. Tankenstein

    Dr. Tankenstein

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    Clear powdercoat in different sheens was my choice

    [​IMG]
    Sent from my iPhone using Tapatalk
     
  7. JNOACK

    JNOACK

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    DEADLINE is a bad word. Shhhh.... I love this frame and I really hope you can get it all done!
     
  8. tjwilson

    tjwilson Pro Member

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    Bare metal it is! I've done some looking around on options for sealing the surface. Looks like a clear coat would work best, as far as leaving the option open to go to paint at a later date? Read some horror stories about trying to clean off boiled linseed oil or WD-40.

    No images but, I did get a spare set of wheels on it and was able to go for a ride! Felt real solid. No movement on the frame. Only issue is the tight front sprocket clearance, easy to fix.

    Knew the seat would be time consuming to modify and get exactly what I wanted. Wasn't disappointed. Spent this weekend reshaping existing inner and outer seat pans and, still have a ways to go. Tick... tick... tick... tick... tick...

    Starting point, cover and foam removed.

    seatOrig.jpg

    Beginning to reshape the back of the seat and narrow the sides.

    seatFirstCuts.jpg

    Upper pan back filled, inner pan in-process.

    seatBackDone.jpg

    Start of seat front reshaping.

    seatFrnt.jpg
     
  9. pholTmonx

    pholTmonx

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    When Luke or the mod squad arrives, I'll beg again for the super deluxe like like feature....
    Simply awsome.
     
  10. Dr. Tankenstein

    Dr. Tankenstein

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    [​IMG]


    Sent from my iPad using Tapatalk
     
  11. LukeTheJoker

    LukeTheJoker Moderator

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    You gotta suggest it to @Rat Rod if you want something, otherwise I will just keep posting the Glove and Boots video...

    Seat looks awesome! Nice work!
    Glad the test ride went well, full steam ahead!

    Luke.
     
  12. pholTmonx

    pholTmonx

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    Not gonna lie I'm more than satisfied with the glove and boots clip thank you!!!
     
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  13. LukeTheJoker

    LukeTheJoker Moderator

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    Here it is again:



    Luke.
     
  14. franconuevo

    franconuevo

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    Nice build TJ .... really like this design

    you talked about grinding the welds down smooth so you don't have to use as much filler.
    Now , it seems like you're going bare steel... that's mighty brave move..:41: . So.., what about the bazillion welds you have on the bike..will you grind them super smooth or use some sort of grayish filler like Jbweld...? Curious...

    welder.jpg

    Super Job
    :thumbsup:
    Franco
     
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  15. tjwilson

    tjwilson Pro Member

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    Thank you very much!

    Your question is well timed. I've been struggling with what the final-final finish will be. Bare metal originally came to mind as a shortcut and way to have a completed bike by the end of the build off. I could always revisit the final finish later when I had more time. I've had good results in the past using plastic filler for a smooth painted finish and had planned to do the same. That fit with what the initial vision for the build was. But, the build has taken a twist or two and the frame's design has become more muscular. A polished painted finish doesn't seem like the best choice anymore. Especially after looking back at the last set of photos of the frame by itself. The comments those received, to me, seem to confirm that impression.

    Ultimately for a bare metal build I'd like to have perfect welds that could be left as is. Don't have the welding skill right now to do that! Not yet anyway ;-) Grinding the welds completely smooth would probably weaken the joints too much. From what I understand any grinding of a weld tends to weaken the joint. If I had used thicker tubing at the start though that would be more of an option. Adding weld to then grind down would probably weaken the surrounding area of the tube too much, again making a weaker connection.

    For the build off I plan to finish the welds similar to what I've done already around the frame head tube and bottom bracket. It will be more of a rough bare metal finish.

    Now for after the build off, I'm still researching. For some reason jbweld doesn't appeal to me. Don't know why. If plastic filler seems fine under paint what's wrong with a metal epoxy? I suppose brazing might be an option. I don't have the equipment for that on hand though. Also don't know if that would introduce a lot of heat. Similar to adding additional weld beads? I'm also looking at solder used with acid flux. Cleaning off the flux residue thoroughly to prevent corrosion seems a concern. Not sure how I would build up any kind of thickness with it either. But in the end, a bare metal finsh with smooth blended transitions between frame parts would be the goal.

    If anyone has any suggestions on a best approach I'd be grateful to hear them!
     
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  16. The Renaissance Man

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

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  17. pholTmonx

    pholTmonx

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    Leading is an option, but honestly I think a bit a pain in trying address tight tubes... You have to work it with a paddle and try get it in there.. I think some areas a bit tight for a first go.

    Brazing isn't that bad, I do it with a Tig so I cheat.

    There is aluminum filler works like Bondo same properties etc but not pink or green is a metallic grey when cleared.easier to work then JB weld..
     
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  18. GuitarlCarl

    GuitarlCarl

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    I filled welds, dents and holes with leaded plumbing solder on a past build off bike and it was easy. I used a plumbers acetylene hand torch, and lots of flux paste. Smoothed with a file and sandpaper. Primed and painted no problem (after washing off the flux) But it would have worked bare metal, looked pretty good.

    Carl.
     
  19. franconuevo

    franconuevo

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    All good concerns about the welding TJ. I'm a still 'novice' welder, using fluxcore, but I was welding some joints yesterday, and man, what improvement over when I first started out last spring. you using mig?

    I now get the penetration I want, and know the settings by feel now , so I no longer worry about poor or weak joints...but , they still aren't real 'pretty' without a lot of sanding and filing, ya know?

    Your welds actually are looking great with the finishing you did. I don't know maybe just a little hand sanding with fine paper may be all you need..but I agree, taking them down 'too far' it does weaken the joint. Globbing on more weld- Ive done that, it just creates more work that isn't 'fun' work. lol It's sortof like getting a decent smooth bondo joint, and then starting over with another heap of bondo.

    I too would be leary of adding more heat...it's bound to pull something out of alignment..especially on all of those little 'bridge' joints on that beautiful frame.

    I like what PhilTmonx said above about the aluminum filler...I was going to try that on some bars that I welded together, but decided to just let the bars go a little crusty rusty on that build.

    I saw one post of someone smoothing out JB weld with some water and his finger..looked to make a super smooth joint...and you wouldn't have to go real thick...Maybe try a little clear on just one of your sanded joints..clear over JB weld, and clear on aluminum putty on a joint underneath or on the bottom somewhere not that visible see what looks best...

    I hear you, it's probably pretty tempting to paint it...but that is just such a sweepingly beautiful frame..I know my mind can't picture it anything other than bare steel either....
    again...:thumbsup::thumbsup:

    franco
     
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  20. tjwilson

    tjwilson Pro Member

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    Thank you all for the input.

    This just might be the answer! Certainly worth a close look.

    Another thought I had with leading is a possible issue with the solder becoming fluid again, on the opposite tube side, when trying to finish off a joint. Might be a steep learning curve. I'll have to do some research and find aluminum filler to give a try.

    I had been wondering if plumbing solder would be a workable solution. Gave it a try, see below for my result...
     
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