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Thread: Frank's SWB build

  1. #1
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    Default Frank's SWB build

    Yep, decided to make one of these to add to my stable, just to see how it rides.....or indeed if it rides.

    Using the Lightning P-38 as my inspiration, mostly square stainless tubing for ease of build. Will go with 20" front wheel, and 24" rear.

    My previous builds had straight chain lines, but for this one gotta figure some chain management, which will be a headache.

    Anyways, a few pics thus far:

    half inch square tube bends easily on wooden former

    two top-rails ready for trimming

    a plank comes in handy to make a jig

    fork is a shortened 26" one from an old MTB

    tacked up ready for next stage.......

  2. #2
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    Default Re: Frank's SWB build

    You make it look all too easy Frank.
    Nice work as always.
    Regards,
    Dan.

    Weld, swear, grind-off & repeat.


  3. #3
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    Default Re: Frank's SWB build

    very nice.

  4. #4
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    Default Re: Frank's SWB build

    Great lines on that frame Frank! What is the square tubing section size? I'm testing my SWB two wheeler at the moment. It's an adventure - not so easy to adapt to as I thought it would be, but I'm persevering.

  5. #5
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    Default Re: Frank's SWB build

    ....the frame thus far is mostly half inch square, with a little three quarter at the rear, and even a little three eighths just for good measure. Scraps left over from other projects really. All is sub 1mm wall, so TIG only methinks. If this one turns out to be a keeper, I'll do another one in galvanised steel, then I'll bring to UK for hols to ride along river towpaths.

    On the subject of square tube, tried to bend three quarter inch square, for the bottom rail, but no joy - too many kinks. The galvanised tube is a bit thicker at 1.2mm, so may be OK to bend on wooden former. Always good fun to experiment ..........

  6. #6
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    Default Re: Frank's SWB build

    When finished will this weigh less than the same bike built with mild steel or old bike parts ?

  7. #7
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    Default Re: Frank's SWB build

    Frank that is a really nice.

    As to bending the 3/4 you could use the Brad technique of cutting slices half way every 1/2 to 1 inch. Bend and weld it backup. Its whet he did on the Velo frame he started. And what Ed did for the Inferno trike.
    See pager 6:http://www.atomiczombie.com/Tutorial...0Page%206.aspx
    Also:http://forum.atomiczombie.com/galler...imageuser=4417
    What's Next?

  8. #8
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    Default Re: Frank's SWB build

    Weight - bit early to say, but ought to be on par with production bikes. A common misconception with stainless is that it's a lot heavier than mild steel, but like for like stainless is in fact around 2% heavier. Factor in no paint, and you'd be splitting hairs weight-wise.

    Stainless is used widely round here, so is cheap and easy to acquire. Downside is it's tough to drill and bend.

    As to kerfing - seems too long winded and brutal to achieve some kind of bend, but each to their own really

    Whats next - figuring the dreaded chainline.......

  9. #9
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    Default Re: Frank's SWB build

    ....think I got the chain line sorted now, not much clearance but just enough:



    ....managed to have the idlers joined in one position, looks better I think than separate:



    ....a brake arm makes a reasonable tensioner. The adjustment screw comes in handy to apply just the right loading:



    ....gonna try out this SRAM 2-speed automatix, they stopped making them a while back so grabbed one to experiment with:



    The chain rubs ever so slightly on the fork, was fine when the frame was upside down, but right side up gravity came in to play and altered things a bit - you live and learn

  10. #10
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    Default Re: Frank's SWB build

    Nice Stuff as always Frank, First test ride looks imminent ;-)
    Regards,
    Dan.

    Weld, swear, grind-off & repeat.


  11. #11
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    Default Re: Frank's SWB build

    Nice looking build!
    K.I.S.S. - Keep It Simple Stupid
    Use it up, wear it out, make it do, or do without

  12. #12
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    Default Re: Frank's SWB build



    .....took it for a 10k test ride today, nothing fell off or broke so pleased with that. Running it with a 16" wheel to start with, as I'm used to having a low BB relative to the seat. Will replace with 20" wheel when I gain confidence. The 2-speed auto hub works a treat, no hills where I live so no need to over complicate things. Hoping to take this one in the car when we go travelling, beach roads are a particular favourite..........

  13. #13
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    Default Re: Frank's SWB build

    Lovely looking Bike!
    Thanks for sharing Frank.
    Regards,
    Dan.

    Weld, swear, grind-off & repeat.


  14. #14
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    Default Re: Frank's SWB build

    Nice build Frank , look forward to the report on the 2 speed hub after you have used it for a few weeks.

    Another interesting build.

    Regards Emma
    It can't rain all the time

  15. #15
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    Default Re: Frank's SWB build

    I'm also interested in the 2 speed auto hub.
    K.I.S.S. - Keep It Simple Stupid
    Use it up, wear it out, make it do, or do without

  16. #16
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    Default Re: Frank's SWB build

    ....SRAM stopped making their 2-speed Automatix a little while back, so not sure how easy to get one now. They also did a version with coaster brake, should have got one of those as well really

    Before getting mine I'd read that the shift point was set too early, but I found the opposite. Tried the hub out on my MTB (26" wheel) back in the UK, and the shifting point felt too long. Works good on this new SWB with 24" drive wheel, and think it would also feel good on a 20" drive wheel. The shifting works on centrifugal force - a set number of RPM triggers the shift.

    Starmey Archer also do a 2-speed hub, but kick-shift, not auto. Would be interesting to try that one by comparison..........

  17. #17
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    Default Re: Frank's SWB build

    Thanks for the write up on the hubs.
    K.I.S.S. - Keep It Simple Stupid
    Use it up, wear it out, make it do, or do without

  18. #18
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    Default Re: Frank's SWB build

    ....was trying to shorten a crankset, but no joy, biggest drill I have is 1/2", so not quite big enough. Also, using old pedal spindle as tap was a bit optimistic, if I tapered it there'd be no thread left, but had an attempt anyway:


    A rummage through the parts bin, and this turned up - then cleaned up and sprayed. Steel cranks, but 145mm long - will do nicely:



    Had borrowed the stem from my LWB, so needed to make a new one:

    seat post makes an ideal extension piece.


    Here's how it looks now, with the 20" wheel installed:




    .....and if you're watching Danny, you're not the only one with shiny nuts


  19. #19
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    Default Re: Frank's SWB build

    Quote Originally Posted by FrankCrank View Post




    .....and if you're watching Danny, you're not the only one with shiny nuts

    I am glad we both see the value in having our nuts nice & shiny Frank.

    Its the little finishing touches that make a difference.
    Regards,
    Dan.

    Weld, swear, grind-off & repeat.


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