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PostPosted: Wed Nov 25, 2015 5:47 am 
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in the industry

Joined: Mon Mar 05, 2012 7:28 am
Posts: 511
Figured I would start a thread on what I've been working on.

All frames start with a cad drawing done with bike cad pro. It allows you to see exactly the proportions of the bike before it is built.

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Next it's decided on the ride quality, stiffness, style or riding, weight goals etc. and tubes are then created. A mix of several different carbon pre preg materials are used.

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I'll post some completed pics and more of the process in the next few days.

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Www.crypticcycles.com Custom carbon frames, bar/stem combos, repair and component tuning.


Last edited by kevosinn on Tue Feb 09, 2016 6:14 pm, edited 2 times in total.

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PostPosted: Wed Nov 25, 2015 2:54 pm 
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Posts: 249
Location: Brasil
Nice to see one more WW member framebuilder! more light development to us. Congrats and sucess!
The fork will chosen based on geometry/ride/style of customer or will a fixed model/geo?


Enviado do meu iPhone usando Tapatalk


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PostPosted: Wed Nov 25, 2015 5:54 pm 
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Posts: 59
Nice to see a special thread dedicated to your frame builds.
I like the mix of different textures...unfortunately I will never be able to purchase a frame from you

Please post as much as possible pictures from the progress and processing


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PostPosted: Wed Nov 25, 2015 11:57 pm 
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Thanks for the kind words guys. I use enve for most forks but I can build a frame to work around any fork. I'm going to offer 3 standard layups and then an option for fully custom layups as well as geometry.

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Www.crypticcycles.com Custom carbon frames, bar/stem combos, repair and component tuning.


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PostPosted: Thu Nov 26, 2015 1:25 am 
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Location: Europe
I'm liking this thread already! Just keep them pix coming, Kevin! :popcorn:

What BB shell ‘standard’ are you gonna use for your first frame?

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PostPosted: Thu Nov 26, 2015 2:35 am 
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The first frame is getting bb86 but I just made all my own tooling to be able to do bb86, English 68mm and pf 30 and bb386.

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Www.crypticcycles.com Custom carbon frames, bar/stem combos, repair and component tuning.


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PostPosted: Thu Nov 26, 2015 3:02 am 
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Machining new fixtures for BB shells on the lathe.

Image

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Last edited by kevosinn on Fri Feb 05, 2016 5:52 am, edited 1 time in total.

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PostPosted: Thu Nov 26, 2015 10:20 am 
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Great thread, I love all this stuff. I modded my own English threaded BB to a PF30. Did you know there's actually an off the shelf carbon tube available with correct internal diameter to accept PF30. Just a thought to save on some tooling :thumbup:


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PostPosted: Thu Nov 26, 2015 11:50 am 
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Brilliant thread and Kevin is giving us a real insight into custom frame building. :thumbup:


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PostPosted: Thu Nov 26, 2015 6:52 pm 
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Thanks! Yes I have found a few places that I could buy pre made tubes from but I own a lathe and mill so making molds and tooling is not too bad! It allows full optimization of all the parts on the bike

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PostPosted: Thu Nov 26, 2015 8:59 pm 
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Posts: 741
Location: Austin
Clannagh wrote:
Great thread, I love all this stuff. I modded my own English threaded BB to a PF30. Did you know there's actually an off the shelf carbon tube available with correct internal diameter to accept PF30. Just a thought to save on some tooling :thumbup:


more importantly the CTE of an aluminum mandrel will make specifying the mandrel OD to produce an exact 45.97mm ID carbon tube very challenging. Its not just the size, thickness/mass of the tube but also temp, dwell of the cook and to further complicate, what kind of and how much carbon in what orientations followed by compaction method. my solid stainless PF30 mandrel went back to a professional grinder 3 times before getting it to a less than 25% reject rate on BBs shell ID. that was after thorough calculations.

you'll get there.

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PostPosted: Thu Nov 26, 2015 9:40 pm 
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nicrump wrote:
Clannagh wrote:
Great thread, I love all this stuff. I modded my own English threaded BB to a PF30. Did you know there's actually an off the shelf carbon tube available with correct internal diameter to accept PF30. Just a thought to save on some tooling :thumbup:


more importantly the CTE of an aluminum mandrel will make specifying the mandrel OD to produce an exact 45.97mm ID carbon tube very challenging. Its not just the size, thickness/mass of the tube but also temp, dwell of the cook and to further complicate, what kind of and how much carbon in what orientations followed by compaction method. my solid stainless PF30 mandrel went back to a professional grinder 3 times before getting it to a less than 25% reject rate on BBs shell ID. that was after thorough calculations.

you'll get there.


Hey thanks for popping in! I sent you an email back last week did you get it?

And yes it's taken me several test runs with multiple materials to get something I'm happy with. I knew thermal expansion would be an issue so I slowly brought the mandrel down to a size that worked well. Stainless is working the best as you said. And I've tested several different layups after I had one that worked size wise. Talk soon hopefully!

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Www.crypticcycles.com Custom carbon frames, bar/stem combos, repair and component tuning.


Last edited by kevosinn on Tue Feb 09, 2016 6:16 pm, edited 1 time in total.

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PostPosted: Thu Nov 26, 2015 11:11 pm 
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Nice work; subscribing to this thread. :thumbup:

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PostPosted: Mon Nov 30, 2015 5:53 pm 
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Posts: 1438
Clannagh wrote:
Did you know there's actually an off the shelf carbon tube available with correct internal diameter to accept PF30

[s]From which supplier?[/s]

edit: didn't have the thinking cap on, there's actually a bunch of places that sell 46mm ID tube that should work for PF30 BB's.

I have actually been looking for a webshop selling 44mm ID tube in small amounts... A quick search only seems to find cheap Chinese tubes from eBay/alibaba as far as I can see?


Last edited by jooo on Mon Nov 30, 2015 7:15 pm, edited 2 times in total.

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PostPosted: Mon Nov 30, 2015 6:41 pm 
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Posts: 185
Location: SF Bay Area
That's so cool to see. How do you actually build the tubes?


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