Are any carbon fiber frame builders active on this forum?
06-01-15, 11:38 PM
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Are any carbon fiber frame builders active on this forum?
I've searched for threads about their builds, and haven't found much.
06-03-15, 11:35 PM
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Does anyone on this forum build CF frames? I'd like to read about your build, but haven't found any threads about your experience.
I'm building a CF frame using ENVE tubes, and Deda Firebox stays. The frame is bonded, and soon I'll be laying up the prepreg on the joints. Right now the oven is being tested, and if all goes according to schedule, the frame will go into the oven next week.
I'm building a CF frame using ENVE tubes, and Deda Firebox stays. The frame is bonded, and soon I'll be laying up the prepreg on the joints. Right now the oven is being tested, and if all goes according to schedule, the frame will go into the oven next week.
06-04-15, 05:20 AM
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Looking forward to updates 
You should have the pics you've taken so far up in here.
How are you going to do the fillets? I'd be inclined to build up large radiuses by laying double-bias (2-ply @ 45° each way) helical with the main axis and some uni interspersed along the tubes, extending as far as practical, curing and shaping a few times along the way to ensure the fillets are as structural as possible... How do plan to apply pressure? Do you have access to a vacuum pump and maybe even a big enough autoclave, or are you just gonna give it a shot with shrink tape?
Also, the way you've designed these two frames with the seatstay wishbone joining the seat tube below where the top tube joins, has introduced more stresses in this area which you'll want to consider... this way the upper part of the top tube / seat tube junction can feel tension; if the compressive load from the seatstays was to be transferred squarely into the top tube the forces would be simpler.
You should have the pics you've taken so far up in here.
Also, the way you've designed these two frames with the seatstay wishbone joining the seat tube below where the top tube joins, has introduced more stresses in this area which you'll want to consider... this way the upper part of the top tube / seat tube junction can feel tension; if the compressive load from the seatstays was to be transferred squarely into the top tube the forces would be simpler.
Last edited by Kimmo; 06-04-15 at 05:53 AM.
06-04-15, 05:37 AM
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it's on my list ... Do a build thread. Not a lot of carbon builders online
06-04-15, 06:32 AM
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Looks like you've bonded directly to the BB shell on your frame (assuming yours is the larger one). Is the shell Al, Ti or steel? What surface prep did you use?
06-04-15, 09:15 PM
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Looking forward to updates
You should have the pics you've taken so far up in here.
How are you going to do the fillets? I'd be inclined to build up large radiuses by laying double-bias (2-ply @ 45° each way) helical with the main axis and some uni interspersed along the tubes, extending as far as practical, curing and shaping a few times along the way to ensure the fillets are as structural as possible... How do plan to apply pressure? Do you have access to a vacuum pump and maybe even a big enough autoclave, or are you just gonna give it a shot with shrink tape?
Also, the way you've designed these two frames with the seatstay wishbone joining the seat tube below where the top tube joins, has introduced more stresses in this area which you'll want to consider... this way the upper part of the top tube / seat tube junction can feel tension; if the compressive load from the seatstays was to be transferred squarely into the top tube the forces would be simpler.
You should have the pics you've taken so far up in here.
How are you going to do the fillets? I'd be inclined to build up large radiuses by laying double-bias (2-ply @ 45° each way) helical with the main axis and some uni interspersed along the tubes, extending as far as practical, curing and shaping a few times along the way to ensure the fillets are as structural as possible... How do plan to apply pressure? Do you have access to a vacuum pump and maybe even a big enough autoclave, or are you just gonna give it a shot with shrink tape?
Also, the way you've designed these two frames with the seatstay wishbone joining the seat tube below where the top tube joins, has introduced more stresses in this area which you'll want to consider... this way the upper part of the top tube / seat tube junction can feel tension; if the compressive load from the seatstays was to be transferred squarely into the top tube the forces would be simpler.
Also remember there will be a seat post in that tube.
The frame will be vacuum bagged during the curing process(baking).
06-04-15, 09:32 PM
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Looking at the layup schedule is mind boggling. When the carbon gets applied, every piece is lays over the joint perfectly, and there are very few cosmetic pieces used.
06-05-15, 06:54 AM
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How are you going to finish it?
06-05-15, 08:33 AM
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today he's doing a few test pieces in the new oven. Yesterday we tested the controls and everything went according to plan.
Next week he's on vacation, so nothing will get done, but the plan is to finish both frames by the 18th.
These frames will be gloss clearcoated.
Next week he's on vacation, so nothing will get done, but the plan is to finish both frames by the 18th.
These frames will be gloss clearcoated.
06-05-15, 09:25 AM
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pre preg is why the oven and vacuum bagging is needed . wet wrap with mixed epoxy is room temperature .
06-05-15, 09:47 AM
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vacuum bagging can be at room temperature too , that is where the smooth comes from , and the bubbles are removed.
can't put a whole boat in an oven, and the USCG doesn't have one for rotor blades either .
can't put a whole boat in an oven, and the USCG doesn't have one for rotor blades either .
Last edited by fietsbob; 06-05-15 at 09:50 AM.
06-05-15, 11:22 AM
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Even when you vacuum bag a wet wrap, the cloth still squirms a bit and messes up the appearance.
06-06-15, 04:55 AM
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When using wet layup it's still worth having an oven for curing or post curing at elevated temperature, it improves the Tg (shorthand for degree of crosslinking in the epoxy).
I make my own tubes on a filament winder which uses a resin bath to impregnate the tow, they are always cured in the oven.
I make my own tubes on a filament winder which uses a resin bath to impregnate the tow, they are always cured in the oven.
Last edited by Mark Kelly; 06-06-15 at 05:05 AM.
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