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Jaf Jarbon Mk-Completed!


Rob Leech

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How do all,

seeing as everyones loving carbon atm, thought i'd have another play.

Had this in my head for quite a while and finally sorted something that i couldnt find before, so here it is-

Drawn up-

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How the carbon is being bonded in-

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Top tube, down tube and seat tube in-

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Seatstays done-

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Should have the rest of the parts made up tomorrow for assembly :).

Got a bit more done today, not as much as i'd hoped, but ahh well, here it is-

Headtube design-

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Dropouts and chainstays done-

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Will hopefully have the booster done in the week, work dependant of course.

27/07-

Got a little more done today -

First 2 inside tubes tacked up

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Welded up, then dressed off

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Outside tubes tacked up (with gussets Mr. C :P), ready to be welded

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Top tube and down tube in, just to check they line up

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One more thing, thought you guys might like to see why it's been a while between frame builds, my latest and biggest project-

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Will be a lotus 7/caterham design when it's done, ally chassis with (hopefully) a full carbon body.

28/07-

Got the headtube welded up and blasted today-

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Had a bit of a booboo tacking up the first seatstay though, carbon tube dosent like fire apparantly :P So it's going to be an ally seat tube now, which is a shame, but ah'well.

31/07

Got another little update for you-

Seatstays tacked up-

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Gussets tacked on-

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All welded up-

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01/08-

Reached a little milestone today-

First tube on dropouts welded up-

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Back in the jig-

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Second tubes welded on, but are going to be ground back and re-done tomorrow i think-

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Mocked up-

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Will be adding a bonded gusset to the rear triangle when it's completed, was going to double up on the tubing, but dosen't seem to be a need for it.

06/08-

Got quite a big update for everyone today-

Decided to double up on the dropouts in the end-

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Got the last bits tacked up, before-

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And after-

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Assembled to check everything fits and position the booster-

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Booster welded on-

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Everything ready for the oven tomorrow, then anodising in the week :)-

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11/08-

Got the frame bonded up on tuesday/wednesday, fully set today, so heres the result :) Let me know what you think (Y).

Before bb, cranks, ect are on-

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And after-

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Had a little roll around on it (nothing proper, have got to make the brake mounts/posts tomorrow, really couldnt be bothered with any turning today :P) and it is quite flexy at the rear end, but after looking at it and getting the old brain wirling, think i've managed to sort it, but anyway, yeah, done :).

Final weight was just over 1.6 btw, but think i'll be looking at a light weight jobbie if this works out.

Cheers,

Josh.

Edited by Rob Leech
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Very interested to see how this turns out. Surely it'll be quite flexible and springy though?

Maybe that's no different from the other comp bikes though, I wouldn't know.

Anyway, as I say, very interested to see how this frame will feel to ride.

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looks aweome i´m interested in how you mount here hs33 mounts :turned:

GL with it but I think it will be to springy IMO. but yeah you have got much more knowledge in this than me so you know what you doing I guess (Y)

The mounts will be on an inbuilt booster welded to the seat stay yoke and also bonded to the carbon section in the seat stay :).

Hopefully not, i've spent quite a bit of time looking into different joint designs for this and the double tube option seems (to me anyway) to be the best choice, especially when you feel just how stiff the carbon is, feels like you could snap it with one hand, but it has no flex what so ever (Y).

Cheers,

Josh.

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I do like your work and this is no exception! I do have one question though, are you welding the alloy parts before fitting the carbon? If not, how will you protect the carbon from the heat?

Looking forward to seeing it finished!

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I do like your work and this is no exception! I do have one question though, are you welding the alloy parts before fitting the carbon? If not, how will you protect the carbon from the heat?

Looking forward to seeing it finished!

Cheers ali, yep, have made it so i can weld up all the sections individually and then bond the carbon in once they've been treated and anodised, I've got it all in the jig whilst im fabricating the parts, just to make sure everything fits and find out if anythings not going work :).

Cheers,

Josh.

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love it, but the carbon chainstay? i know you'll want to avoid hitting the bike into anything but my chainstays always take a hit or two on a ride, i'd just have the toptube and seat stays myself... good effort though! hope it's as ace to ride as it looks :)

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Looks great! :)... untill you fail a sidehop or miss time a gap.

It does look pretty good though.

I've got that covered, all will be revealed soon enough :).

Cheers,

Josh.

BTW, will hopefully have another update tomorrow, been a bit busy on the proper work side this week (Y).

Oh, and i think you'll be surprised at how easy it is to do a decent repair on carbon tube, so if a crack/smash does occur, it can be repaired (Y).

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