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Thread: Cycle Frame welding job
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28th April 2015, 08:39 PM #1Senior Member
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Cycle Frame welding job
Gday all. I`m in the middle of building a stretch chopper cargo combo. (2.5m long!!) The guy who did the innitial welding has moved on & i need to have either two support tubes which i have ready or the dagger shaped piece currently taped in position welded. Liverpool area Sydney. Payment of any nature is no problem.
CIMG0001.jpgCargoStretch N.jpg
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29th April 2015, 07:14 PM #2GOLD MEMBER
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Do you have access to oxy acetylene, if so you could spot braze it about 1-2" miss 4" and so forth.
Kryn
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29th April 2015, 11:33 PM #3Senior Member
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Gday Kryn. Had thought of that. I feel the support tubes which basically follow a similar line of /or the dagger play an integral part of firming the main tube need to be fully welded. Can build/weld bleeding trailers (got a stick & a gasless mig) but come unstuck with a damn bicycle frame!
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30th April 2015, 08:26 PM #4GOLD MEMBER
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I guarantee that they don't need full welds. In fact full welds will probably hurt your case. Any cracking will occur at the toe of the last weld and a stitched weld on that dagger section will exceed by far the strength of the tube.
How thick is the tube? 1.6 or 2.0mm electrodes may well do the job for you.
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1st May 2015, 11:08 AM #5Senior Member
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I'd do it for you if I were in Sydney. I personally prefer the idea of top tubes from the head tube/down tube intersection to the top of the cargo rack for strength, forming a kind of cargo box frame if that were suitable for your needs. Stronger than your dagger piece but harder to fit up cleanly.
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1st May 2015, 09:17 PM #6Senior Member
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I originally had two support tubes - one either side of the head tube - you can see where i cut them off on in pic. The other side you can just see where (below the curtain) it (the tube) was welded to cargo frame. Why did i cut them off? I decided to add a springer fork which fouled on lock to lock. Currently i have a definitive 9 to 3 left/right lock. Thanks though for all the ideas/advice.Gives me something to work on.
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1st May 2015, 10:39 PM #7Senior Member
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Oh yeah, I see. I was thinking more of some creative bending and coping so that the top tubes intersect at about a 45 degree angle with the head tube. Then there'd be no fouling issues. You'd need to be handy with the hole saw and a die grinder though.
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2nd May 2015, 09:15 AM #8Senior Member
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Seems to be just a few bending loads on that frame and fork v the normal cargo bike, if you loaded it up without a compression tube, even with the brace. You could try Peter Bundy, who was over at Riverwood last I heard, judging by the cut-off, it's no thin wall bike tube, so hardly framebuilder touch required....and there's no shortage of welders in Liverpool and surrounds who could do it, but the liability aspect might scare them off without knowing what the rest is like.
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2nd May 2015, 05:23 PM #9Senior Member
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CIMG0146.jpgCIMG0147.JPGCIMG0148.jpg
So a few pics re welding red coloured tube supports which better suits the design aspect also. One thing i did forget to mention is in Pic 2 (arrow) there is a circumference weld (with an insert) where this main tube continues up to fork tube/down & along as part of the cargo frame. Innitially i had centre steer off the middle upright tube but have since added ape hangers & moved bars to front.It makes for a much more comfortable ride.
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2nd May 2015, 07:06 PM #10Senior Member
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The more of a box you can make, the stronger it will be, if that's an issue. I.e. top tubes from the head tube to the top of the back of the cargo rack, parallel to the ground.
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3rd May 2015, 02:51 AM #11GOLD MEMBER
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Looking at your picture https://www.woodworkforums.com/attach...1&d=1430213938 the forks appear very light for the angle they are mounted at. I realise that there are arms that come up to the spring suspension, but it looks awfully light to me from what I can see. The main tube of the frame appears quite beefy in comparison.
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3rd May 2015, 09:25 AM #12Senior Member
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Gday Karl. The original build utilised standard Huffy mtb forks which worked well. I then decided the look wasn`t what i wanted & opted for the 26" springer fork having spoken with the Melb based stockist who assured me they would be just as strong as they use these on their modded dragsters/choppers,some of which are around the same length as mine. Once fitted i then knew it needed apes as opposed to the straight mid mounted bars & i now have the look i want. Once i sort the welding situation out (have since found a local co that will do the job) theres a couple of lockable abs panniers to fit on rear rack,one of which will house a battery to power the twin 12v headlights & the factory fitted pannier tail lights.Making use of the central upright tube by adding a 'dash board' which will house an 8" ipad/mobile phone connection/switches with wiring down the tube,under frame to battery.
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3rd May 2015, 09:53 AM #13GOLD MEMBER
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No worries mate, bikes aren't really my field of expertise as such.
Iphones and Ipads on a dashboard - sounds like this is going to be the starship enterprise of the bike world.
Certainly an interesting build.
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