Brake lever


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kylle
kylle
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I'm planing to make a carbon brake lever.
Q1:  Should a two part mould be strong enough to do this?
Q2:Now I'm seeing a lot of bike part brands using unidirectional carbon layers to do this kind of works. what do you advise? twill or uni?


example of a carbon brake lever:
http://www.bikebling.com/v/vspfiles/photos/Formula-Carbon-Levers-R1-2T.jpg



MJCT
MJCT
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Q2 - Most forces will be along the levers but not only, for that reason, I believe you should use both uni and twill (or plain).

 

Q1 - What do you mean by "strong"?


kylle
kylle
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Q1-bad choice of words.... (rusty english)

I meant if it's reliable enough to make a clean job. I'm planing to make a 2 sided mould and apply  G clamps to press it together.

Q2- How many layer's and what order should I follow?

MJCT
MJCT
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I own a pair of Formula R1 myself but my leavers are made of magnesium. Some time ago I also thought about making a pair of leavers in carbon. I concluded that the only way to get an acceptable result was whit a 2 sided mold.

I don't have a single idea about the number, weight, or type of the fabric used. If you get your ands on one lever that you're willing to sacrifice you can sand it little by little uncovering the different layers. You can understand how many layers, the type of fabric weave and the orientation of the weave. The weight and thickness of the fabric can be a little trickier for the untrained eye. It's kind of reverse engineering.

You can always find the thickness on a carbon lever and try to replicate it whit the fabrics that you already have.

You should always respect symmetry - when viewed in cross section your laminate should be symmetric respecting the middle plane. You should also respect balance (equilibrium regarding - and + angled plies). 

 Other terms that you should account for are "quasi-isotropic", "nesting" and "stacking".
kylle
kylle
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 Other terms that you should account for are "quasi-isotropic", "nesting" and "stacking" ? what do they mean?

Know U speek portuguese!!! explain it in portuguese! PM

MJCT
MJCT
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Open your mail box.
kylle
kylle
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MJCT (23/02/2012)
Open your mail box.
didn-t get anything!!!
MJCT
MJCT
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I’ve sent you an email to your Hotmail mailbox on February 22. But I’ll send it again.
MJCT
MJCT
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The mail goes like this (to much troble to translate every thing, but all you folks can use google translate any way).

"Olá,

Eu também não percebo o que se passa, mas não me deixa mandar mails ou PMs pesados.
Agora o assunto fica resolvido.

As páginas que te envio fazem parte deste livro http://www.amazon.co.uk/gp/product/1560277521/ref=oh_o02_s00_i00_details que é o ideal para iniciares.
Podes também adquirir estes dois http://www.amazon.co.uk/gp/product/1929133766/ref=oh_o01_s00_i00_details, http://www.amazon.co.uk/gp/product/1929133766/ref=oh_o01_s00_i00_details, embora o primeiro seja um bocado básico se calhar vale a pena.
Este também é uma boa ideia http://www.amazon.co.uk/gp/product/1844257010/ref=oh_o00_s00_i01_details.

Também tens cursos mas são para o carote. Em Inglaterra recomendo-te a http://www.darkmattercomposites.co.uk/. Tens lá um PDF com todos os cursos, datas e preços.
Tens também a Abaris que funciona maioritariamente em Reno nos EUA, embora também tenham cursos no UK e até no Brasil http://www.abaris.com/.

(...)

De qualquer das formas é um bocado difícil manter um negócio baseado só em peças para bikes... e estou a falar em fazer também guiadores e espigões, e como são peças estruturais e que só vendem bem se forem muito leves a coisa complica-se. Por um lado têm de ser muito leves e com acabamentos perfeitos, por outro lado não podem partir senão acabas com o teu próprio negócio. Se te mantiveres pelas peças não estruturais, tipo guarda-lamas, provavelmente vais ter dificuldades em recuperar o investimento inicial em bomba de vácuo e outras coisas.

Um aviso final, não é boa ideia usar ferramentas eléctricas para serrar, lixar, aspirar e até furar em fibra de carbono. O pó do carbono é um bom condutor de electricidade... com fibra de vidro ou kevlar não há problemas.

Se tiveres mais dúvidas não tenhas problemas em perguntar.

Best regards 
 
Mário Tiago"
mhdghoul
mhdghoul
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i think u should use kevlar after 4 layers of carbon and i think u should fill it with resin before you attach the 2 sides so it would be solid from inside , but beleive me its just an opinion i never tried it to tell u that its right or wrong , if u did and it worked please tell me.

best regards mhd alghoul mhdghoul@hotmail.com youtube channel :atmospherejo link is http://www.youtube.com/user/atmospherejo?ob=0&feature=results_main
GO

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