Homemade Parts!

PB Forum :: Mechanics' Lounge
Homemade Parts!
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flag numeros
Posted: Oct 20, 2019 at 12:16 Quote
Beauty of work mate
flag Pedro404
Posted: Oct 20, 2019 at 13:50 Quote
That's super nicely made for a one-off!
flag NorCalNomad
O+
Posted: Oct 20, 2019 at 18:00 Quote
psynide wrote:
Built this for a frame with stripped BB threads. CNC machined from 2014 aluminum.
photo

Eek

Are those tightening notations milled/ lasered into it + paint in the debossed areas? Damn impressive if so. Salute
flag Beecee336
Posted: Oct 20, 2019 at 21:23 Quote
Looks laser marked. Nice work!
flag intentbikes
Posted: Oct 20, 2019 at 21:46 Quote
Thanks guys. Laser etched.
flag zeeman
Posted: Oct 29, 2019 at 9:48 Quote
Wow, Marko the stem is looking great!
flag walkingtall76
Posted: Oct 29, 2019 at 13:03 Quote
psynide wrote:
Built this for a frame with stripped BB threads. CNC machined from 2014 aluminum.
photo

How do you get it to stay firm inside a BB without threads? Is it shimmed perfect to size that it presses in and acts like a press fit bearing? Or??
flag numeros
Posted: Oct 29, 2019 at 13:04 Quote
Thank you Zeeman, still working on it as first one failed, and hopefully this will early prototype will be finished.
flag NorCalNomad
O+
Posted: Oct 29, 2019 at 16:42 Quote
walkingtall76 wrote:
psynide wrote:
Built this for a frame with stripped BB threads. CNC machined from 2014 aluminum.
photo

How do you get it to stay firm inside a BB without threads? Is it shimmed perfect to size that it presses in and acts like a press fit bearing? Or??

I'd guess there are threads that connect the two pieces where that parting line is in the middle.
flag walkingtall76
Posted: Oct 29, 2019 at 22:41 Quote
NorCalNomad wrote:
walkingtall76 wrote:
psynide wrote:
Built this for a frame with stripped BB threads. CNC machined from 2014 aluminum.
photo

How do you get it to stay firm inside a BB without threads? Is it shimmed perfect to size that it presses in and acts like a press fit bearing? Or??

I'd guess there are threads that connect the two pieces where that parting line is in the middle.

Even if that were the case, the strength would be too weak. The amount of force put on it externally from a rotation wouldn't hold up. It would still need to be press fit somehow, then obviously that would void the ability to thread the center. There's a reason external BB are designed the way they are...
flag bikerboywill
Posted: Oct 30, 2019 at 4:35 Quote
At a guess the bb shell would be reemed to the same size as this bb. It will then thread together and fit like a press fit.

Wheels mfg make bb’s with a similar concept for normal press fit bb’s to stop them coming loose and creaking.
flag walkingtall76
Posted: Oct 30, 2019 at 6:53 Quote
bikerboywill wrote:
At a guess the bb shell would be reemed to the same size as this bb. It will then thread together and fit like a press fit.

Wheels mfg make bb’s with a similar concept for normal press fit bb’s to stop them coming loose and creaking.

Lol- It's impossible to thread something and press it at the same time... hence the reason there are press fit BB and threaded BB.
flag Ploutre
Posted: Oct 30, 2019 at 6:57 Quote
walkingtall76 wrote:
Lol- It's impossible to thread something and press it at the same time... hence the reason there are press fit BB and threaded BB.

https://wheelsmfg.com/pf30-threaded-abec-3-bb-black.html

Not exactly the model mentionned, but the concept definitely works.
flag ktm87
O+
Posted: Oct 30, 2019 at 7:02 Quote
walkingtall76 wrote:
bikerboywill wrote:
At a guess the bb shell would be reemed to the same size as this bb. It will then thread together and fit like a press fit.

Wheels mfg make bb’s with a similar concept for normal press fit bb’s to stop them coming loose and creaking.

Lol- It's impossible to thread something and press it at the same time... hence the reason there are press fit BB and threaded BB.
the shells would thread together in the center to each other.
flag walkingtall76
Posted: Oct 30, 2019 at 7:40 Quote
Ploutre wrote:
walkingtall76 wrote:
Lol- It's impossible to thread something and press it at the same time... hence the reason there are press fit BB and threaded BB.

https://wheelsmfg.com/pf30-threaded-abec-3-bb-black.html

Not exactly the model mentionned, but the concept definitely works.

Lol- completely different setup. This entire BB sits internally using the complete width of the bikes BB. This is not an external BB. The external rotation force wont effect a BB like this. However the one he created will... it will creak and crack

 


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