Sandelco forum
Projekt => Ybnormal projekt => Ämnet startat av: Stiffy skrivet juli 03, 2013, 14:54:33 PM
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it starts with an idea.
find something that fits, like an unwanted 50's husqvarna. and draw up some plans..
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You go girl!
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Now all is "plockepin" and a drawing
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Sweet!
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so, the process continues. cleaning up of the fork crown for accurate measurement and disassembly.
it's too narrow for the fatter tyres i eventually want to use (622 x 1.75/2.0) so the crown will need to be rebuilt (pink sections in the first drawing). i plan to use the original forks and head tube. i'll have a new wider and heavier (3mm instead of 2.5mm) set of plates water cut for the crown and attempt to braze it all back together straight and true. width will go from 83mm to 110mm. at least that's the plan. unfortunately it does involve cutting up the old fork crown..
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frame fitting.
benke printed out a full size drawing for me on his plotter at work. fantastic, as it means i can check the fit of all parts as i go along, in particular the frame dimensions. got a fair bit of cutting and bending left to do..
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inspiration.
we all need some:
http://www.youtube.com/watch?v=vhRTOZV5yfY
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Great ambitions my friend. You can camp in the shop at anytime!
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Gimme more!
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shit va vi kröka i lördags! Det här blir bra!
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First bit of tube bending done last night with much help from Benke.
Decided to make a jig directly on a table surface. Leveled the table first, then marked out frame placement. Two straight pieces of wood and one cut to the desired curve were screwed to the work surface.
Filled the tube with dry sand and plugged the open end with cork and heavy silver tape. The head tube has a small internal opening at the down tube junction so i rolled some rubber mat for a tight fit.
Frame was held in a vice and oxy acetylene heated, then quickly transferred to the jig and pulled by hand. To ensure a smooth, clean bend we did this in two smaller stages rather then try to do the whole bend in one go. Initially i wanted a 10° bend but decided on 12° for a steeper down tube angle.
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a quick update – new drawing with motor mount, motor and possible exhaust.
and what's that – a mudguard (aka 'fender' for those of a more westerly persuasion) on the rear? wow.
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Ah, that's a beauty!
But I'm not sure of the mudguard...?
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will have to experiment some more..
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Snyggt Stiffy. Kommer låta gött det där. Snyggt med plattan under motorn!
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ok, time for an update, it's been a while..
a little frame action before xmas.
first, a set of motor mounts, involving some lathe work and brazing. these will be brazed/welded into the down tube to fix the motor mounting plate to the frame.
second, a rear lower triangle bridge to replace the old one after i widened the lower triangle. this involved a lot of filing and shaping. i could have made a simple straight one, but why take the easy way out? that's not the whole story though, often the material has something to say. it wants to be a certain way and who am i to argue?
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a little more frame work tonight. made a top tube extension - basically a short length of tube welded to the end of the top tube with a slug. drilled three holes through both the top tube and the extension and rosette welded, then the seam was also welded. then a lot of filing and sanding..
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a little more frame work tonight. made a top tube extension - basically a short length of tube welded to the end of the top tube with a slug. drilled three holes through both the top tube and the extension and rosette welded, then the seam was also welded. then a lot of filing and sanding..
It´s fine too see jou work on the frame lasat evening. ;D
The work goes forward a very,very small bit
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very small :)
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ok, a little game of spot the difference. the difference between this latest iteration and the last (v2.3). just can't stop messing with the drawing. always something to update.
and just for fun an image with a representation of a 1.93m tall human (me, of course). makes the bike look really small..
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Wohoo, you're stiff and you're skinny, but not that stiff and skinny...!
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Vissa gör vad som hellst för att vara snabbast.
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Wohoo, you're stiff and you're skinny, but not that stiff and skinny...!
dead stiff. dead skinny. haa!
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did some painting tonight - one of the many layers of colour on the rims - gold!
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did some painting tonight - one of the many layers of colour on the rims - gold!
Riktigt härlig bild.. ;D
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Riktigt härlig bild.. ;D
benke! med lite post production av mig..
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at last! super nice watercut motor plates and dropouts arrived today. 5mm, with details which will be brazed on, in 1mm thickness. and an unexpected bonus - these were made using Domex hot rolled, extra high strength cold forming steel - normally used for heavy plant machinery, cranes, truck chassis.. they happened to get thrown in with a bigger job, a stroke of good fortune.
very nice feeling to prepare a drawing, send it away and end up with a finished part. outsourcing is where it's at. next is the easy part - to fit them to the frame..
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Bingo, Sir Stiffy. Looks smaching!
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Sweet, that's the way to do it!
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nothing like a bit of tube coping! cutting, filing, fitting. repeat. repeat. repeat.
until you get a nice tight fit. getting there!