Berk PROTO-TYPE Composites

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Berk
Carbon Cowboy
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Joined: Sat Sep 04, 2010 7:20 pm
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by Berk

Thanks for the compliments!

About the forks - unfortunately I also don't know the exact meausures, I will have to meausure it.

The geometry is based on my position in the past 2 years and is quite similar to my actual frame (I ride frame size "L", I have quite short legs for my 185cm) and I made the frame for a 25mm offset seatpost. Altough I will most probably made an integrated saddle, I won't change the angle of the seat-tube because it will be possible to use also a stubby with an ordinary saddle if I would rather use an ordinary saddle, and if I will change the position, etc.,... maybe I will even use an ordinary seatpost, that will be also possible, because it is 31.6mm in the inside of the seat-tube...will see :wink: first I have to finish the frame. Unfortunately I'm not a lot at home and quite busy at this moment, I just came home from Italy where I had a few races, and on Friday I'll again go abroad,..anyway, as soon as I will find some more time for this project I will keep you updated.
Berk PROTO-TYPE Composites - Handmade In Slovenia
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DuPreez
Posts: 22
Joined: Wed Apr 27, 2011 12:13 pm
Location: London

by DuPreez

I've had more of a look and without surprise previous weightweenies posts have provided the answers :D . That said you will have to make an assumption that the addict fork has the same dimensions as a CR1 fork. The dimensions are as follows;

3t Funda 43mm x 367mm
Scott CR1 45mm x 380mm

At a glance the scott fork ought to raise the front end by approximately 1cm (give or take a few mm depending on other geometric factors). I would definitely try both as they ought to have a significant effect on all geometric choices you have made.

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Mr.Hyde
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Joined: Fri Sep 05, 2008 1:03 am

by Mr.Hyde

Cool dropouts, with the internal cabel routing. Can't wait for the next update :-)

BmanX
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by BmanX

What I love about these builds is that they keep getting better and better every time. I can not wait till he decides to make his ultimate dream bike.
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Epic-o
Posts: 621
Joined: Tue Nov 20, 2007 7:18 pm

by Epic-o

You have beaten Peter Denk's dropouts by just 0.6gr...

Great work. One question, what tools do you use to dimensionate your frames?
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Berk
Carbon Cowboy
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by Berk

First of all thanks to all and for those specifications :beerchug:

@DuPreez
I will sure try with both forks, of course as soon as I manage to make the frame and build a bike.. :wink:


@Mr.Hyde
Thanks! I will consider those dropouts as a "test model" and will make then some new one (the same shape).


@Epic-o
Hopefully I understood your question right - I fix all the parts on a flat surface and first glue all the parts together to provide that everything is precise. After that I make some more carbon work on the joints, etc..




Here just a few more photos from those dropouts, just to show you how I will make it with the internal routing.

Image

Image
You can see the orange small tube - those small tubes will be in-laminated in the inside of the tubes and connected together in one smooth line, so that the cable will run smooth and the instalation of the cables won't be a problem. It's true that it will be a bit harder to make it, but it will be worth the extra work :thumbup:


Rough dropout with cable:
Image

The small tube in the dropout is slightly curved because the rear derailleur cable routing.
Image

The weight of this dropout is at this moment 31.7g. Anyway, I will make a new pair of them and they still have to be a bit shorter for the frame etc.,..at the end it should be less than 60g for both dropouts.

This week (till Friday) I'm still very busy and hopefully I will manage to continue with the work soon, just can't wait that I make some more work on this project!
Yesterday I had a criterium race here in Slovenia (http://tinypic.com/view.php?pic=6iv8tj&s=7), altough I helped my team-mate who is a sprinter, I finished in 10th place..unfortunately he crashed and finished only on 9th place, but anyway, it was a nice race also with some Slovenian pro riders from Geox, Liquigas, Lampre,...probably you know Bole and Koren?...just to let you know that I spend a lot of time training, racing,.. :wink:



BmanX wrote:What I love about these builds is that they keep getting better and better every time. I can not wait till he decides to make his ultimate dream bike.


It's really very interesting also for me. I will for sure contiune making some new components, frames,..altough I don't really need them because I ride my sponsor equipment, but anyway :mrgreen:... After I make this frame I will have to decide what will be my next project (a TT frame or a wheelset, will see, hopefully both, it depends also on my financial status...probably I will first try to make only the front wheel, I already designed all the details for the moulds, procedure,..but first I will finish this frame).
My dream bike would probably be with Di2 internal routing and of course with most of the components made by me ;)...
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Epic-o
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by Epic-o

Berk wrote:@Epic-o
Hopefully I understood your question right - I fix all the parts on a flat surface and first glue all the parts together to provide that everything is precise. After that I make some more carbon work on the joints, etc..


No, I was referring to study wall thickness, number of additional layers in the joints, inertias, etc to make sure that your frame won't break

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Berk
Carbon Cowboy
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by Berk

I work on the base of already known details about the wall thickness for carbon frames and also from my own experiances for the thickness of tubes and joints (for instance - the toptube of the frame is one of the thinnest/weakest tube..). I calculate how much different types of carbon I have to use on the joints. I use also some carbon/kelvar hybrid fibres to prevent cracking. And of course also all the areas where any holes are (for the cable instalation, bottle cages, etc.) are also reinforced with some carbon/kevlar and some more carbon fibre to prevent cracking and to assure the stiffness of the tube.
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rjk8
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by rjk8

Jure you always make the sickest carbon originals. Keep up the great posts. :thumbup:
R.J.
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Berk
Carbon Cowboy
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by Berk

@rjk8
Thanks :thumbup:


I have some more photos, but unfortunately not from the frame project.. I made another combo, this time it is SUB 120g!

119.2g 8)
Image
31.6mm x 280mm

Image
The tube is 2.2mm thick.


I already made some more work on the frame, but only with the shape of the tubes. As soon as there will be some more "carbon progress" I will let you know. Till then, hope you at least enjoy those photos from my other projects... :thumbup:
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mythical
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by mythical

These are exciting developments, Jure. Can't wait to see photos of the main triangle! :thumbup:
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Berk
Carbon Cowboy
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by Berk

Thanks! I will give my best to make it as soon as possible because I also just can't wait that I put it together! As you mentioned, I will first have to glue together the front triangle, and as soon as it will be done I will post some new photos :thumbup:
Berk PROTO-TYPE Composites - Handmade In Slovenia
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Berk
Carbon Cowboy
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Joined: Sat Sep 04, 2010 7:20 pm
Location: Slovenia

by Berk

Some details for the cable routing..."integrated cable end caps":


Image

The diemater of the cable stop is only 6mm. I don't like those huge holes for the internal instalation like on some serial frames (on my team bike Cento1 it is 12mm for the internal routing/cable stop...)

Image

And the top-tube:
Image



Of course I will still have to do some more work on the surface etc.,...but I will make it later, when I will bond the tubes together and after that I will probably cover the cable routing details with the same beauty layer as on the tubes,..anyway, hope you like it! The cable stops are simple, useful and lightweight :thumbup:
Berk PROTO-TYPE Composites - Handmade In Slovenia
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USofChay
Posts: 425
Joined: Tue May 25, 2010 11:24 pm

by USofChay

Very cool! I like the shape a lot -- very sleek. Why is the cosmetic finish so different?


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Berk
Carbon Cowboy
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by Berk

USofChay wrote:Very cool! I like the shape a lot -- very sleek. Why is the cosmetic finish so different?


I'm glad that you like it!
The cosmetic finish is some kind of UD-look because I made a carbon fibre compound to "glue" the cable stops. It is a mixture of carbon and two other mixtures (not epoxy, but some special glues for carbon/carbon and carbon/ALU). I made it by myself and I like the way you can work with it :thumbup: of course I will have to sand it and at the end I will most probably also cover it with the same beauty layer as on the tubes.
Berk PROTO-TYPE Composites - Handmade In Slovenia
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