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PostPosted: Wed Oct 16, 2013 7:21 am 
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Carbon Cowboy
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Location: Slovenia
Yes some of the tubes change a bit. The seat tube, seatstays and downtube are round/oval. The toptube changes it's shape all the way, and also chainstays of course.

Yes, basicly I started with this project to see how a different layup will perform. In theory it should be a bit improved and it may save some weight. But mostly because I changed a bit the design of the seatstays. Otherwise in general the thickness is pretty much the same, but there will be more layers, or better said more thinner pieces of carbon (the thickness will be prety much the same) used for this project. It's a bit more specific layup and I'm really interested how it will perform compared to my previous frame project.

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Posted: Wed Oct 16, 2013 7:21 am 


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PostPosted: Wed Oct 16, 2013 8:21 am 
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Joined: Fri Jan 28, 2005 11:51 am
Posts: 252
Location: arezzo (italy)
Hi berk,

have you ever considered to start project for frame with moulding process? Draw frame on cad and then make frame's part mould with a cnc machine. I have a littele hobby cnc machine and I would like to try this technics, in your opinion what are the biggest problems?


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PostPosted: Wed Oct 16, 2013 8:50 am 
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Carbon Cowboy
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Hi danny,
sure I did, but the main problem are at this moment the costs. Basicly I made the moulds by myself and they're ok, but of course I would really like to make it someday with a CNC machine and with metal.
The second problem is that all those companies where they make me those moulds are just too busy or not really willing to work on those moulds. For example that's the problem with my saddle project, where I wait for weeks/months to get the moulds. Otherwise once I have one mould I can make more moulds by myself (I can copy it and make a carbon fiber mould..). If I would have my own CNC machine I bet I would realize all my projects as soon as I would get the idea, but as an 21 years old studend I really can't afford it yet. Hopefully some day:)

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PostPosted: Wed Oct 16, 2013 3:41 pm 
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Location: arezzo (italy)
in your projects do you ever use prepeg or only normal cloth? I know the problem for prepeg is to storage in a fridge but have more put life for working.


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PostPosted: Wed Oct 16, 2013 5:45 pm 
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Carbon Cowboy
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I do have some prepreg properly stored, but at this moment I don't really work a lot with it. But my aim is to completely switch to prepreg as soon as possible.


Here just another update, also glued the seatstays, the weight at this moment is 668g:
Image

Next step is to make the carbon reinforcements on the joints, it may add around 200g, we'll see...of course some more sanding etc. to do before I start with the last step of carbon work.

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PostPosted: Wed Oct 16, 2013 6:24 pm 
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Joined: Thu Jun 03, 2010 6:20 am
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Congrats on reaching 100 pages Berk! Your body of work is simply ridiculous.


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PostPosted: Wed Oct 16, 2013 8:16 pm 
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Joined: Fri Jan 28, 2005 11:51 am
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Location: arezzo (italy)
which type of bb do you use in this project? pressfit?


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PostPosted: Wed Oct 16, 2013 10:01 pm 
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Carbon Cowboy
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@tharmor
Thanks, I just love this work!

@danny
Yes it's pressfit BB30, like I have on my PT5 bike.

The headtube is tapered 1 1/8 - 1 1/4

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PostPosted: Thu Oct 17, 2013 3:56 am 
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Hi just wanted to say I went through each of the 100 pages and very impressed with your work and dedication. Amazing!


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PostPosted: Thu Oct 17, 2013 10:01 pm 
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Thank You Berg to repair my saddle. Regards from Spain


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PostPosted: Thu Oct 17, 2013 11:40 pm 
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Joined: Wed Feb 01, 2012 9:12 pm
Posts: 16
Jure, any chance you can post up some pictures of your bladders and techniques for making them out of vacuum film, I'm very interested in your process.
Bill


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PostPosted: Sun Oct 20, 2013 10:59 am 
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Carbon Cowboy
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@layer29
Wow, thanks :beerchug:

@trilocus
No problem!
(repaired the saddle rails and also changed the leather, sorry for the bad photo quality)
Image

@progetto
Unfortunatley I don't have any photos at this moment, can make them as soon as I'll have the chance. Otherwise I make the bladders by myself, I think that I already posted a photo (not sure?) from the bladder that I used to make the chainstays.

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PostPosted: Thu Oct 24, 2013 7:25 pm 
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Carbon Cowboy
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Location: Slovenia
Headtube reinforcements in process.
Image

This time I'll reinforce each joint separately, just to get all the details how much does each reinfocement weight...this frame should have around 800g once it's finished.
Compared to PT5 it should have the similar properties, but with more than 100g lower weight, mostly because I changed a bit the chainstays and toptube, and the complete layup is different..I'll keep you updated!

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PostPosted: Fri Oct 25, 2013 8:45 pm 
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Carbon Cowboy
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Location: Slovenia
Headtube bearing seats are also made with carbon:
Image
On the photo you can see also the moulds that still have to be prepared for some carbon work

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PostPosted: Fri Oct 25, 2013 9:01 pm 
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Joined: Wed Feb 01, 2012 9:12 pm
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Thanx for the construction photo's Jure, it's always good to see how people tackle this side of the work. Keep them coming.
Bill


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Posted: Fri Oct 25, 2013 9:01 pm 


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