Home Made Bikes

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Posted: Nov 9, 2019 at 16:46 Quote
foxonabike wrote:
Made a stand up bike out of an old 24" wheel MTB, great fun and everybody looks and thinks WTF!
(how to add photos?)

https://photos.app.goo.gl/SRRRvGyF66RzypoN8
https://photos.app.goo.gl/hmzUJQRGKbHzSRqc6
https://photos.app.goo.gl/2gKg4fWy5e89LnsZ6

photo

Posted: Nov 9, 2019 at 17:33 Quote
Got it
SUB
photo
photo
Made the hinge and stem as well
Folding stem hinge

Posted: Nov 10, 2019 at 9:13 Quote
Thanks, I hate it.

Posted: Nov 10, 2019 at 23:24 Quote
sherbet wrote:
Thanks, I hate it.

Too many positive vibes lately?
You know what thread you're in, right? Going to see some botched stuff here.

Pimp

Posted: Nov 12, 2019 at 8:17 Quote
JimmyGrand wrote:
Does anyone know of a european supplier of 7005 aluminium tubing - preferably T0 or T4?

not europe but https://www.cycle-frames.com/bicycle-frame-tubing/home.php

reynolds is out of UK so they must have some sales somewhere? why concerend with heat treatment? 7005 doesnt need post weld HT. iir T0 T4 are not related to tubing but its been a loooong time since i read about that

Posted: Nov 14, 2019 at 0:02 Quote
lifted-d wrote:
JimmyGrand wrote:
Does anyone know of a european supplier of 7005 aluminium tubing - preferably T0 or T4?

not europe but https://www.cycle-frames.com/bicycle-frame-tubing/home.php

reynolds is out of UK so they must have some sales somewhere? why concerend with heat treatment? 7005 doesnt need post weld HT. iir T0 T4 are not related to tubing but its been a loooong time since i read about that

Thank you, I´ll hit up Reynolds.

I might very well be wrong, but as far as I know, T0, T4 and T6(or any other Tx value for that matter), refers to the thermal treatment the aluminium has been exposed to, regardless of shape(tubing, block, etc.).

And in regards to the need for it with 7005 tubing, it seems some manufacturers use it some might not. If I´ve understood everything correctly the microstructure is messed up post-weld, therefore you "reset" the structure by heating to XXX temperature for a small amount of time - then cool the frame in air or liquid. Now the frame is of T4 quality(uniform microstructure), to optain T6 quality the frame needs to be aged for a certain amount of hours at a lower temp - this hardens and strengthens the frame.

I´m in no way an expert, but it´s my understanding that 7005 naturally ages at room temp, but in order to optain the optimum strength(T6) artificial aging is needed.

Posted: Nov 14, 2019 at 3:28 Quote
Don't think Reynolds do alu, no mention of it on the price sheet I've got.

Columbus do some alloy tubes I think

Posted: Dec 3, 2019 at 2:39 Quote
Alright guys, any got any picture of their alignment table set ups or ideas for a budget friendly design?

O+
Posted: Dec 3, 2019 at 14:34 Quote
hey all looking to find someone who can CNC and make a steel/alu full sus, let me know. thanks!

Posted: Dec 14, 2019 at 17:47 Quote
JimmyGrand wrote:
Does anyone know of a european supplier of 7005 aluminium tubing - preferably T0 or T4?

nope but i know a supplier of 7020

O+
Posted: Dec 15, 2019 at 17:00 Quote
It's not a full frame yet, but I'm starting to get excited! This is the bottom bracket junction of a gravel bike frame that I've been working on for a while now. It's compression molded out of fiberglass for now, and I'll re-do it in carbon fiber hopefully in the near future. This part was made in 3D printed molds using a removable 3D printed core material.

Bottom bracket junction molded with removable mandrel

Bottom bracket junction molded with removable mandrel

Bottom bracket junction molded with removable mandrel

Bottom bracket junction molded with removable mandrel

Fiberglass plies for a 20 layer mandrel layup of the bottom bracket junction

Posted: Dec 15, 2019 at 17:53 Quote
Bigtiresrbetter wrote:
[ ... ] 3D printed molds [ ... ]

Neat. How much pressure are you able to use with those molds?

O+
Posted: Dec 15, 2019 at 18:11 Quote
Infusion or just wet layup? Awesome proof of concept either way man tup

O+
Posted: Dec 15, 2019 at 18:46 Quote
This part was a wet layup around a PVA mandrel that was dissolved out after the resin cured. I also did a part using a bladder system in this mold using ~10 psi, which was all my bladders could handle. The mold should be able to handle a bit more than that.

Posted: Dec 16, 2019 at 5:09 Quote
Nice to see the stepwise progression. Thank you for the update and I hope it goes well!


 


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